I’m referring to masks we use for editing digital photographs. They are one of the most powerful tools we have. A lot of magic goes on behind a mask.
I will use Lightroom Classic and Photoshop for my examples, because I know them best, but this is not a how-to article.
Adjustments
Some of the most widely used editing operations in photography are adjustments. An adjustment means that some property of the image data is modified – more or less, color shift, higher or lower contrast, etc.
I believe that all photo editing tools have some means of making adjustments. Some of them differ in the ability to make only global adjustments, affecting the whole image, or masked adjustments, affecting only a selected part.
Whether global or selected, the adjustment alters some property of the image. For example, some of the Lightroom adjustments are temperature, tint, exposure, contrast, highlights, shadows, whites, blacks, texture, clarity, dehaze, vibrance, and saturation.There are others. This is just an overview.
©Ed Schlotzhauer
Why adjust?
I’m talking about adjustments as if they are a good thing. But why do we need them?
When we load photographs into our computer, they are mostly in the form of a jpg or a raw file. A jpg file (broken acronym for Joint Photographic Experts Group – the jpeg was shortened to jpg back in the days when Windows only supported 3-character file extensions) is fast and easy, highly compressed to save storage, and VERY highly processed. The algorithms have already made the decisions about how the image should look in terms of brightness, color balance, contrast, etc. Generally, they look good as soon as you see them. Average, but good. They may need some adjustments, but usually little.
A raw file is just that, it contains almost the raw data off the camera sensor. Almost, because all cameras do some processing of the data. It might “fix” bad pixels or apply some “secret sauce” algorithms proprietary to the manufacturer to correct for sensor characteristics or to give the manufacturer’s “look”. Each manufacturer’s raw format is different.
Raw processing software, such as Adobe Lightroom Classic, reads the proprietary raw format, does Bayer filter demosaicing, and gets the data converted to an array of pixel values. The image we see on screen at that point is rather bland. Contrast is low, colors are not vibrant, it is not ready to share.
By the way, the Bayer filter is one of the secrets that is baked into our camera technology. It is elegantly simple, but a little deceitful. Check it out in this blog. You do not have to understand it to take great pictures, but understanding it gives you a little more mastery of the technology.
I only shoot raw files, but why do that if it requires more work? When it comes to my images, I’m a control freak. I choose to do the adjustments myself according to my vision rather than letting an algorithm do it. And raw files have much more data and can be edited to a much larger degree than jpg.
©Ed Schlotzhauer
A mask
I said that adjustments can be global or selective. Masks are commonly used to do selective adjustments. Being able to work precisely on areas that need adjustment gives us far more precision and control.
Think of a mask like a stencil. It blocks some areas from being altered but lets the adjustment flow through to other areas. Because we are using digital technology, the mask can be “perfect”. That is, it can totally block the adjustment where we do not want it. Or if you prefer, the mask can be a fractional value, allowing us to only let a portion of the adjustment through. This allows great artistic control.
The concept and application of masking was not created in digital. photography. It goes back to stencils, block printing, wood cuts, watercolor painting, integrated circuit production, etc. With our current technology, it just becomes far easier to use it.
©Ed Schlotzhauer
Power
Global adjustments are a big hammer. They change everything. That is useful, but not adequate. What if there is a small portion of the frame where we want to viewer’s eye directed? A masked adjustment to select only that area does it. It is more and more common to want to selectively lighten or darken some areas, to change the color of a small area, or to change the color or contrast of just the sky or a portion of the sky.
These are examples. It would be impossible to list all the applications of masked adjustments. I believe that masking is a critical skill for photographers doing digital processing of images. If you don’t or can’t do it, you will be at a disadvantage compared to other artists.
If an image is going into my portfolio, or if I am going to print it, it is almost certain that there will be extensive masked adjustments made to it. Masking has become such an indispensable tool that I can’t not use it. Why would I choose to ignore one of the most powerful creative tools I have?
©Ed Schlotzhauer
Benefits of AI
From my viewpoint, the last few years of maturation for Lightroom Classic has revolved around more and easier to use masked adjustments and AI-aided mask creation. These are 2 very powerful trends. And yes, AI is in there.
A few years ago, only a few adjustments had any rudimentary mask capability, on an individual basis. Now, it has flipped. The app has extensive masking, and we can apply adjustments through them. A much better model.
Besides the manually created masks, there are many excellent AI generated ones. Sky selection has been around for a while, and it is getting much better as algorithms improve. So is the Subject selection. There is detailed ability to mask people, from the whole person, their skin, or clothes, down to just the pupils of their eyes. And they are pretty decent masks.
Have you tried the Landscape mask? It is fairly new. You can let it find and create separate masks for sky, snow, architecture, vegetation, water, natural ground, artificial ground, and mountains. It is a great tool for quickly separating blocks of an image for individual work. The masks are usually pretty good. But like all things AI, it works well most of the time but fails spectacularly at others. I often try it first to see if it can tease apart the areas I want to adjust separately.
The Adobe “AI” ability to locate areas and mask them is improving steadily and bringing us much benefit. If the AI can do what we would have to do manually, and give even better results, I would be crazy not to use it. Using AI to generate a mask is not at all contrary to my vows to not use it to create my images.
Need Photoshop?
The steady improvement of Lightroom Classic brings up a question I often ask myself: do I still need Photoshop?
Much of the time, the answer is “no”. Well over 90% of my final images never see Photoshop. Lightroom is getting very adequate for most image correction tasks.
There is another class of edits, though. The strength, and a weakness, of Lightroom, is that it cannot create or destroy pixels. It is a strength, because all our edits are non-destructive. Anything can be undone with no damage. But some image manipulation I want to do involves major pixel damage.
A simple case is compositing. Lightroom cannot bring all or parts of several images together as one image. Photoshop does this without breaking a sweat. It is happy to do anything we want to any or all the pixels in an image. Many of these edits are destructive, that is, they cannot be undone. But if that is what I want to do, that is the tool that will do it.
And in Photoshop, the masking is even more powerful. Learning to use masking in Lightroom creates knowledge that carries over, in principle, to Photoshop.
Example
Here is a simple before and after example of LIghtroom Classic adjustments. There is nothing special about the image. It is just one I shot last week in the Rocky Mountains. The first image is a raw image right out of my Nikon Z7-II. The second is after some quick adjustments, many using masks. No Photoshop was involved. Which one, if either, would you rather show people?
©Ed Schlotzhauer
©Ed Schlotzhauer
Put on your mask
I hope I have convinced you that masking is one of the power features everyone needs to become confident with. Accept it. Learn it. Masks create magic. They are one of the simplest image editing tools to make your photographs stand out.
I think you will find your images will look better and have more impact when you get familiar with digital masking.



©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer
©Ed Schlotzhauer

©Ed Schlotzhauer
©Ed Schlotzhauer