Ed Schlotzhauer

An artists journey

Category: Craft

  • Pixels, PPI, DPI

    Pixels, PPI, DPI

    Pardon me, but sometimes the Engineer in me has to rant. I see so much confusion about pixels and how to scale them to an output size. Pixels are just an RGB dot. How they are presented is up to the output driver. It is complicated at a technical level, but it does not have to be complicated to us poor users. So let’s see what pixels and PPI (pixels per inch) and DPI (dots per inch) really mean mean.

    What are pixels?

    A digital file is just a rectangular array of pixels. The term “pixel” is a contraction of “picture element”. It is the smallest dot the sensor can resolve or the smallest point of light a display can produce.

    Getting to the array of pixels is complicated, since camera sensors don’t read them directly. See my article “How We Get Color Images“. Regardless of what magic actually happens, by the time you view an image on your computer monitor, it is an array of pixels. Conceptually each pixel is represented as a triplet of (Red value, Green value, Blue value). Each of the values is a number from 8 to 16 bits in size. So each value has a magnitude of 0 to 255 or 0 to 65536. What sizes you actually have is determined by the capability of your sensor (the dynamic range) and camera and the color space you are using.

    Pixels have no physical meaning. In the main camera I use, the array is 8256 x 5504 pixels. Again, it is just a number. It has no physical meaning. It has no relation by itself to a print size or the size of the image on screen.

    What PPI should I use for display?

    This is the thing that annoys me the most. I constantly see museum and gallery directors put out requirement that we have to send in electronic samples sized to 72 PPI. PPI stands for pixels per inch.

    Way back in the dim distant past, computers only did text. Then Apple came along and wanted to do graphics. They did research and decided 72 PPI looked good on screen. This set the standard, but hasn’t been the case for eons of computer age. The display on my fairly old iMac is about 218 PPI, physically. But the magic 72 PPI stuck with a lot of people.

    The increases in PPI density and bit depth and speed of monitors is one of the great technological advances of computers in recent years. All those pixels on screen makes for very sharp and smooth images. We can see so much more.

    Worse, many people have been led to believe that the PPI sizing of the image files means something. It doesn’t anymore. Actually, it never did for images displayed on screen. The PPI setting has little or no meaning for an image displayed on screen.

    Try it

    Try an experiment: take an arbitrary, fairly large jpg file of your choosing. Let’s say the filename is MyFile.jpg. Load it into Photoshop and resize, WITHOUT RESCALING, to 72 PPI. Save it as MyFile-72.jpg. Now reload the original file.jpg and size it to 360 PPI. Again without rescaling. Save it as MyFile-360.jpg. Rescaling changes the number of pixels in the file. We just want to change the PPI setting. These 2 files now have the same number of pixels but different ppi scaling.

    Now use whatever image preview application you like and view the 2 sized files. Is one of them 5 times larger than the other? On my system, they are exactly the same size on screen. Even though one is set to be 72 PPI and one is 360 PPI. They are displayed as the same size and the same resolution.

    Why is this? Because the file PPI setting means nothing. The display app just looks at the number of pixels and decides how large it is going to make it. If it is a tiny image, say 300×200 pixels, it will probably make it very small to avoid pixelization artifacts when an image is enlarged too much. It it is a reasonable sized file, it will just pick a good output size. It makes these choices based on the number of pixels. If the image is in a web page, the web page code determines the size the image will be.

    What PPI should I use for print?

    Now we head into an even more confusing area, and here the confusion is somewhat justified. Printing is it’s own special world. The technology and perception is very different from displays. Displays emit light. Prints reflect light. The effect to the viewer is very different.

    Printers don’t have pixels. Instead, we refer to the output scaling as DPI – dots per inch. This recognizes that we are now talking about physical marks on paper (or your substrate of choice).

    The printer manufacturers have created tremendous confusion in customer’s minds because they overload terms. The Canon Pro-1000 printer I have at my studio has a specified print resolution of 2400 DPI horizontally and 1200 DPI vertically. Yet the optimum print resolution is 300 DPI. That is, when I am creating a print, I should try to set the output resolution to 300 DPI. This is bound to confuse most people. Why not set the output to 2400 dpi for maximum resolution?

    How inkjet printers make nice prints

    We come to one of the secrets of printers. We customers want prints with crisp lines and smooth gradations of color and tone. As natural as film used to be, or as smooth as the original artwork we are copying. An inkjet printer sprays dots of ink onto the paper. A dot or no dot. At the level of a single dot, this is not smooth. Inkjet inks do not “mix” to create new colors.

    So take my Canon printer as an example. Each “dot” (at 300 per inch) is actually subdivided into an 8×4 grid – 8*300 is 2400 dots per inch horizontally. Any position in this 8×4 sub-grid can contain any combination of printer dots of any of the 12 colors. The print driver uses a magical algorithm called “error diffusion” to cover the sub-grid with a blend of printer dots of the available colors that simulate the color and intensity of the pixel to be printed there.

    It is mind bending in it’s complexity. One reason they don’t talk about it much is that it is proprietary for each manufacturer and printer, a closely kept trade secret. The good news is that they take over this complexity so we don’t have to. And they do a very good job. So I set my image to print at 300 DPI and magic happens.

    It usually doesn’t matter

    In summary, PPI settings do not matter for images displayed on your monitor or on the web or sent to your social media account. If someone tells you they need their images scaled to 72 PPI, just smile and do it, but secretly know they do not know what they are talking about. Only the total number of pixels affects the size of the image. And without going into mind numbing detail, I hope this takes a little mystery out of the way printing works.

    I feel better now. 🙂 How about you? Are you more or less confused?

  • Fall in Love

    Fall in Love

    I advocate it, but I’m not talking about a romantic meeting. Making art should be an act of love. We should fall in love with our works, or else, why do them?

    Because it’s there

    I mostly wander and explore without a lot of planning or result in mind. Sometimes I shoot pictures just because something is kind of interesting and I’m there to see it. That can be good, but usually not.

    Being an explorer, I follow my curiosity. I tend to try a lot of experiments to see what happens. So if something tweaks my interest I often see what I can do with it. Occasionally I have a tingle and excitement when I press the shutter, knowing that I have captured something I love. Sometimes it doesn’t happen until I am reviewing the image large on my computer. Then I discover that it is far more interesting than I thought at the time I took it. Both are joyous occurrences.

    More often than not, I find I have well composed, well exposed pictures of – nothing much. I look at them later and say “yeah, it was an interesting scene and it’s an OK picture, but it doesn’t grab me.” Usually I think it is because I did not feel strongly about the subject or scene. I didn’t fall in love with it.

    If I don’t feel passion for the image, how can I expect you to when you view it? It is pretty obvious to me which ones really grab me. I think you can perceive it, too.

    Over-planning

    At the opposite end I see some photographers occasionally get trapped by over planning. Conventional wisdom from many renowned photographers is that any photo trip or outing should be planned out in great detail. They will research a location extensively, looking at pictures from other photographers to try to find the “best” places and positions and angles and times and seasons. In addition, they will use tools like The Photographer’s Ephemeris to select the exact time and day and location to get the exact sunrise/sunset/moonrise/ etc. shot they want. And they may book an outing with a workshop or guide to help with the logistics and transportation.

    Is there anything wrong with doing it this way? Absolutely not, if that is the way you work. Different personality types need to approach things in different ways. Do what works for you, but don’t get into a mental trap.

    One of the traps I see is that we tend to get so invested in the preparation for the shot that we have to take it. We spent a lot of time and money to get to that point. It becomes a quest. It has artificially become so important that we have to take the pictures to validate and justify the trip.

    But what happens when you get there and the weather is “bad”? Bad being not what you planned for. Maybe you don’t like the workshop leader or structure. Worst, what do you do when you get there after all the planning and expense, look at the scene, and feel “meh”?

    Of course you take the pictures. You have to. But if you’re honest, they may not make your portfolio set you are excited to show people. There was just no life there. You can check off that you got the iconic shot, but maybe it ends up not being very important.

    Having our expectations too high can lead to disappointment.

    Anti-planning?

    You can guess from what I’ve written that detailed planning is not for me. I am almost an anti-planner. I tend to come at things the opposite way. Going to iconic locations and fighting for a tripod location and taking the exact same image 10,000 other photographers have taken just in the last month is not a motivation for me.

    Yes, the scene is beautiful. Yes, it is probably salable because it is the type of image people like to have on their wall. Economically it is foolish to not get this image and pander to the crowd.

    But for me, even though I think the scene is beautiful, I probably will not feel great passion for it. How can I distinguish myself from the thousands of other photographers shooting the same things? How can I tell my story or share my feelings?

    In love

    Back to the original statement of this article, I believe I have to fall in love with my images. If I am going to show you something I have made, it has to be much more than good. It has to have a passion you can sense. How can I bring you art you want unless I feel strongly about it?

    Thoreau said “A man has not seen a thing who has not felt it.” The famous photographer John Sexton said “Too often we attempt to force a photograph out of a situation rather than allow the situation to speak to us.”

    I am guilty at times of trying to force images to be there when I’m not actually listening and feeling. I recognize it. It is painfully obvious when I am reviewing them in Lightroom that I have a bunch of well executed pictures that mean nothing to me. Trashing them is the best thing to do. And use it as a reminder to follow the passion more than the light. If I don’t have a sense of wonder and passion for the image that is a good sign that it probably didn’t work.

    “Follow your passion” is not always good advice in life – you have to do a lot of things you don’t like. But in art it is great advice. It may not be the clear path to fame and fortune, but you will feel good about what you create. And your viewers can tell. Love your work.

    This example

    I have used this image at the top before. It is a good illustration of my point here, though.

    I love this image. I could stare at it for a long time. It speaks to me at a level I can’t even describe. The rich color, the organic flow, the streaks of movement over time, the standing wave shapes, the minimalist simplicity all move me.

    This as shown here is almost straight out of the camera. It is what I shot. Yes, it has been cropped square and had some minor tone corrections, but this is what I discovered and jumped on. The color and the time effects of the flow are as shot. I liked it as seen through the viewfinder. I loved it after I saw it large on the computer.

    It is one of the few pictures I have hanging on my wall at home.

  • Photoshopped

    Photoshopped

    It may be said as an insult. It may be used to shame the photographer as “not a purist”. But should it be? What is wrong with an image being Photoshopped?

    History

    Photography began as a medium of realism. It is said that Impressionist painting (Monet, vanGogh, etc) was a reaction to the realism of photography. They took their art is a direction photography could not challenge – at the time.

    Have you ever thought of traditional painting changing its direction because of photography?

    The development of Impressionism can be considered partly as a reaction by artists to the challenge presented by photography, which seemed to devalue the artist’s skill in reproducing reality. Both portrait and landscape paintings were deemed somewhat deficient and lacking in truth as photography “produced lifelike images much more efficiently and reliably”.[31]

    Because of the history, and the fact that everything the lens sees is recorded in detail, people tend to have an expectation that a photograph is “real”. A picture can’t lie.

    Not only is this wrong in so many ways, but it is no longer a realistic expectation of photography.

    Common practice

    All photographs are altered from what the sensor recorded. Even if you just take that picture you snapped on your phone and post it to social media, it was altered a lot before you ever saw it. All sorts of distortion corrections, color enhancements, gamma correction and noise reduction was done by the phone. Their algorithms are very good at making the picture look like what you expected to see. It is not the same as the phone recorded.

    All images you see in prints or any media are altered – Photoshopped. Some massively. Some just minor color correction and tone enhancements. I would never insult you by showing you an unprocessed picture. Unless it was to make a point about the kind of processing I do.

    Even to do black & white these days requires a lot of image processing.

    Did you know that even movies are “Photoshopped”? An obvious example is CGI. That stands for computer generated imagery. It proudly states that a lot of what you are seeing is artificially created. And we love it in big action movies.

    Nearly all movies are digitally recorded now . All are processed and retouched frame by frame in addition to CGI enhancements. The overall color you see is even completely controlled. They call it color grading. The entire look and shading of each scene is digitally processed to set the mood the director wants.

    Bad Photoshopping

    One thing I will join people in denouncing is bad Photoshopping. Photoshop is a very complex program to master. It can take years – and they are constantly changing it. But even so, we are artists. We have no excuse for not mastering our tools.

    Not knowing how to use the tools to accomplish our vision is like a painter not knowing how to use a brush or a metal sculptor not knowing how to weld. Just using some simple sliders to make the color of an image wonky is not much of an artistic statement.

    Yet I have heard well-known professionals almost brag about their limited knowledge of Photoshop. But the reality is that they know enough to do what they want. The exception is Jay Maisel. Jay is one of the greats who I admire. He brags that he does not even have Photoshop on his computer. That is probably true, but he has full time assistants who do have it and can make a picture look like what he tells them he wants. So, a slight exaggeration for dramatic effect.

    For the others, though, who really do not know Photoshop well: spend time learning it. It will reward you by making you more efficient and it will open up new artistic possibilities for you.

    Artistic expression

    My work is called “fine art”. I don’t like the term, but we are stuck with it. Fine art, among other things, means it is not literal or representational. I feel free to bend and even break pixels to any degree I want to bring you the art I see.

    I guarantee that any image of mine you see has been processed in Lightroom Classic and maybe Photoshop. Both great tools are well capable of altering the reality of the original frame. And I do alter them.

    It can range from basic color and tone correction to removing distracting elements to compositing several images together to create something new. Anything is fair game. The more adapt at my tools I get, the more I am able to use them to help me change my vision. It is circular: what we find out we can do helps us to see new things to do.

    Accept it

    I accepted it a long time ago. My Photoshopping goes back to about version 5 or 6. In the beginning, I was mostly just doing minor corrections on my very realistic landscapes. I have fond memories of the controversy in the camera club I was in at the time when I won best of show with the first digitally manipulated image ever submitted to them.

    Since then I keep widening my vision and perspective. Realism was so deeply ingrained in me that I have had to work at giving myself permission to let my imagination go free.

    I’m not where I want to be yet, but I take a much more liberal view of what I can do in an image. Still, I am my own limitation.

    If you are seeking “truth” in images, be careful. But if it is important to you, do some research to find out if the image has been manipulated materially. It has been manipulated. but that doesn’t mean content has been added or deleted.

    Finding truth is rare in our world. When you look at an image, assume it is art, not truth. At least, that will be true for my work. I may bring truth, but that does not mean it is realism. My images are photoshopped.

    The future

    In the 19th century, painting was mostly about realism. Then photography came along and took over realism. So painting moved to Impressionism and modernism and abstraction. Now digital art is perfectly capable of creating any abstract or impressionist images we desire. Where will painting go next to separate themselves?

  • Evolution of an Image

    Evolution of an Image

    Not all images follow the same life cycle. Sometimes it is pretty straightforward. See a scene; click; some post processing; done. Other times the path is winding, even circular. It is impossible for an image to be ready for a final print right out of the camera. Sometimes that shows an evolution of the artists perception of an image.

    Of something

    A lot of very good pictures are simply images of something. We find a lovely or interesting scene and we take a picture. Yes, we work the scene, find a good position to make a good composition. Wait for great light. Then make the shot.

    It represents something real and concrete. It is what it is. There is nothing abstract or surreal about it. No hidden meaning. As I write this I am on a trip going through a part of the country that has lots of beautiful trees. I am shooting a lot of pictures of trees. Just because I like them. And they’re all around.

    Most of these images, though, are ending up being just pictures of trees or fields. That doesn’t mean I don’t like them, but they are straight forward record shots of a scene I saw. It is the rare one that seems to actually have something deeper to offer.

    About something

    A goal is to bring something more than just a “here is what I saw”. I hope to occasionally make a statement or observation that will be helpful or insightful. Hopefully, I can bring you something more than just a pretty picture. I can only reveal to you what I emotionally reacted to at the time. It is up to me to react to the scene and be able to bring some of that to you.

    This is a wide grey area. One person’s “depth” may be another person’s “duh”. My perception of the significance of something may be different from yours. All I can do is to say what I think. I cannot control how you receive it.

    And the degree of depth or insight will vary all over the place. An image may have insight on something of human nature, or it may be humorous, or it may be ironic, or it may make a statement about the march of time or environmental issues. Good images do not have to be deeply serious. Few of mine are heavy commentary on social issues. My reaction to the world is governed more by joy and gratitude.

    So when you see my images, assume they probably have some insight I have perceived about the scene or subject. It may not be dark and depressing, but that does not take away from my intent to say something.

    A life of its own

    Sometimes, though, an image takes on another direction, a new life. I occasionally recognize that the original image is not complete or fully formed. It may need to be combined with other images or heavily worked to change it into something different.

    Take the image with this article for example. It started out a fairly interesting shot out of a favorite restaurant window. This particular window had 100+ year old glass that was wavy and distorted. Blurred in the background were some downtown buildings, trees, awnings, etc. I liked the scene and shot it repeatedly until I captured the impression I wanted (many lunches there!).

    But I was not happy with it as it was. It was an abstract view of downtown, but it was too abstract to be an effective representation of a downtown street, but not abstract enough to become something completely different and interesting in it’s own right. So I decided to go much further.

    Ah, the joys of Photoshop. It is fun to play sometimes. I added textures and played with colors and saturation and hues. Some overlay patterns gave it more definition and shape. Pretty soon it had nothing to do with the downtown scene I originally liked. If you sat where I shot the picture and looked out the same window, you would not recognize it.

    The image now has a life of its own, completely independent of the original scene. I like it. It is a fun creative exercise. But I have to find the right base images to work with. And I have to form a vision of where I want to go. Only a few images are good subjects for such a treatment.

    It means what it means

    Coming to this point requires me to address the question of what does an image “mean”? Can a picture have a meaning? Does it have to?

    There seems to be at least 2 opposing groups. Some say a picture is worthless unless it means something. The other says very few pictures can have an actual meaning, except for some photojournalism. As in most things in life, I range somewhere in the middle. Generally I say don’t take yourself so serious. A good picture can just be a nice, pleasing picture. If I have the opportunity to make images with meaning I usually will, but I don’t want the meaning to get in the way of the quality of the image.

    I get frustrated with people who are so sincere and focused on something that is important to them that they feel everyone must share their angst. Lighten up. First make art.

    I do make images with meaning, especially if I am shooting a project that is fairly serious. When I have the filter of a project in mind my focus tends to narrow to the subject. But unless it is a particularly dark and depressing subject, I want to concentrate first on making art. I tend to avoid the really dark and depressing projects. That is just not me and I don’t think they would make your life better.

    Summary

    The vast majority of the billions of photographs shot each year are record shots of something. They serve to capture a memory or mark an occasion. This was their intent and the work for that.

    A small percentage of photos and paintings go further and reveal something interesting. Maybe it is a new insight on a subject. Maybe it is just the artist’s emotional reaction at the time. But we look at them and often agree that they bring something deeper than just a snapshot.

    Or sometimes a picture becomes a thing in itself. Not a representation or even an interpretation. It just exists as a new creation. A lot of abstract and surreal art is like this.

    In my case, I am a lens-based artist. That means I start from something concrete – an image – rather than a blank canvas. Sometimes as I live with an image and think about what it could be, I morph it into something new. That is the case for the image with this article.

    I’m not saying this is a desired evolutionary path for an artist or that some steps are better than others. But artists tend to evolve their skills and viewpoints as they mature. I have observed myself moving through a progression. More and more of the images I like are abstract.

  • Unrecognized

    Unrecognized

    Sometimes things are right there staring us in the face. But we don’t or can’t see it. We fail to see what should be obvious. This in an internal problem. We don’t get to blame anyone else. Don’t go through life with unrecognized interest all around.

    Unrecognized artist

    “Unrecognized” is a fairly ambiguous word. Well, not really ambiguous, it is just that it can be applied so many ways. One of the first things that comes to mind when I hear the phrase is my sadness at being an “unrecognized” artist.

    Even though I have sales and good gallery representation and I get exhibited, it feels like nothing. Failure. I seek to be more widely known. A goal is to share my vision with many more people.

    But this aspect of “unrecognized” is not what I am discussing in this article.

    Unrecognized beauty

    Most people I know sort of drift through life in a daze. We follow our normal paths, doing basically the same thing all the time without really seeing things around us.

    If we recognize the rut we are in, we can climb out. At least enough to make a difference. Just deciding that we are going to pay more attention to things around us will go a long way.

    There is beauty all around us, even if you live in a city. Disappointed that you don’t live in Yosemite? Get over it. Learn to appreciate where you are. Even if you are not thrilled with your environment, by learning to look more closely we can usually find things, even little things, to brighten our day. Is there a flower, or a tree, or a pattern of light and shadow on a building that catches your eye? Look at it. Stop and take a moment to appreciate it.

    This will grow a habit of mindfulness. It will help us become more aware of what is there and more grateful of the little scenes that brighten out day, make us feel more alive.

    Unrecognized self

    Many of us, I’m pointing to myself, too, have trouble recognizing where our creative instincts are leading us. We change all the time. It can be hard if we feel like we are starting to be recognized for a certain style or subject. We fear that changing would lose our market. But at least that person is aware of what is going on. Most of us, I feel, one day realize that what we are drawn to is different from what we have been practicing for a long time. This can shake us to our bones. But it can also be refreshing and invigorating to re-align with where our subconscious is directing us.

    I think this quote from a very good photographer from the past, David Vestal. is enlightening.

    As we work, we come to know more and become more patient and less inclined to rush past our own work that we don’t yet recognize. Now I am quicker to see in my own new work the “accidental” good photos that I used to ignore.

    Mr. Vestal points out 3 key things that are common and key to our artistic growth.

    Know more

    As we practice our art we learn. Our technical abilities grow and our creative capabilities are stretched. The more we learn the deeper vocabulary we have to express what we see and feel. We also have more ability to examine our art and critique it.

    If we’re lucky, we even get to a point where we know what we don’t know. But the path of knowing more sometimes means we grow away from the positions we held in the past.

    More patient

    Mr. Vestal describes part of the growth process as becoming more patient. With ourselves. I know for myself, I feel less need now to shoot quantities of images. I used to be in a frenzied rush to capture everything that was the least bit interesting. These days I will usually come back with fewer images. I can see something nice and not feel the need to take a picture. Sometimes it is sufficient to just acknowledge it and appreciate it. I would rather have a few images that excite me rather than a whole pile of “OK” pictures.

    I think this also applies to our results and growth as an artist. Have you ever found yourself trying to “force” a great image. I do. Maybe less than I used to. As I grow I am more interested in trying to see more clearly what is there and understand how I perceive it, what I want to do with it. Sometimes it doesn’t come. Rather than be a big frustration, it is an opportunity to try to figure out why.

    Have you ever come upon what would be one of your “standard” images, one you would always shoot, and said, “no, that doesn’t interest me today”? Something is speaking to you to tell you you have grown to a new position.

    Recognize

    To me, the phrase in his quote “less inclined to rush past our own work that we don’t yet recognize” is brilliant. I sometimes run across something while I am looking for a particular image. Something I didn’t think was very good, but for some reason I kept it. Looking at it some time later I liked it much better. Sometimes I realize that if far more representative of my current vision that things I used to shoot.

    He describes them as accidentally good shots. I believe these accidental shots are sometimes our subconscious trying to show us something we don’t recognize yet. As we grow in our artistic concept, we have to leave the past behind. We become bored with what we used to proudly do. Recognize that feeling. Learn from it. It is time to move on.

    I have described before that I tend to be fairly brutal about culling out bad or uninteresting shots. Sometimes, though, I am compelled to keep an image that I don’t think I like. Sometimes I find, later, that this image is significant to me. It may even be a pivot to a new direction in my journey. I did not recognize it at the time, but I did perceive that there was something there that made me keep the image and come back to it later.

    Be receptive

    I believe we should learn to be more receptive to these signals our subconscious is sending us. The subconscious mind is more powerful than the conscious mind. It understands us better. It is not deluded by ego or financial considerations or social media followers.

    I have heard it said that this message from our subconscious is usually not a light bulb going on, it is more like a tickle on the back of our neck. That little feeling that there is something here we are missing or need to figure out. Maturity is learning to be aware of this hint and follow it to see where it leads us.

    How about you? Have you ever puzzled over an image you couldn’t figure out, only to recognize later that it was a harbinger of a new direction for your creative work? The way to a new creative plateau? Did you trust your instincts and embrace the new direction? What was the result?

    I would like to know! Leave a comment or email me.