Applying Auto Tone, Contrast And Color As Adjustment Layers
Step 1: Add A Levels Or Curves Adjustment Layer
Even though it’s easy to apply Photoshop’s Auto image commands as adjustment layers, the way you do it isn’t all that obvious. For starters, there’s no actual Auto Tone, Auto Contrast or Auto Color adjustment layer. Instead, the commands are made available to us as options in other adjustment layers, namely Levels and Curves. With my image newly opened in Photoshop, I’ll add a Levels adjustment layer by clicking on the New Fill or Adjustment Layer icon at the bottom of the Layers panel:
Clicking the New Fill or Adjustment Layer icon.
Then I’ll choose Levels from the list that appears. I could also choose a Curves adjustment layer here which would give me access to the same Auto options, but most people find Levels less intimidating:
Adding a Levels adjustment layer.
Nothing will happen to the image just yet, but if we look in the Layers panel, we see that Photoshop has added the Levels adjustment layer above the image:
The Levels adjustment layer appears above the Background layer.
Step 2: Open The Auto Color Correction Options
The options and controls for the Levels adjustment layer are found in the Properties panel, and this is where we access the Auto commands. There’s a couple of ways to get to them. One way is by clicking on the small menu icon in the top right corner of the Properties panel:
Clicking the Properties panel menu icon.
Then choosing Auto Options from the menu:
Choosing Auto Options from the Properties panel menu.
The other way to access the Auto options is by pressing and holding the Alt (Win) / Option (Mac) key on your keyboard and clicking the Auto button:
Press and hold Alt (Win) / Option (Mac) and click the Auto button.
Either way opens the Auto Color Correction Options dialog box. The section we’re interested in here is the Algorithms section at the top. Notice that there’s four different options to choose from. For this tutorial, we’re only going to focus on the top three (Enhance Monochromatic Contrast, Enhance Per Channel Contrast, and Find Dark & Light Colors) since they’re the ones that correspond to the three Auto image commands. We’ll save the fourth one, Enhance Brightness and Contrast, for later when we look more closely at Photoshop’s Brightness/Contrast adjustment:
The top three options match the three Auto image commands.
Step 3: Try Out The Different Algorithms
As I mentioned, each of the top three options corresponds to one of the three Auto image commands. They’re not actually named Auto Tone, Auto Contrast and Auto Color, but if you’ve read through the previous tutorial, you might have noticed that the names we find here are actually descriptions of how each of the Auto commands works.
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The first option at the top, Enhance Monochromatic Contrast, describes how the Auto Contrast command works. Choosing this option will give us the exact same result as if we had selected the static Auto Contrast command from under the Image menu. To quickly recap, Auto Contrast looks at all three color channels (Red, Green and Blue) as a single composite image and boosts overall contrast by making the darkest pixels in the image black, the lightest pixels white, and then redistributing all the other tonal values in between. Only the contrast is affected. The original colors in the image remain the same.
If you can’t remember the details of how each Auto command works but you have Tool Tips enabled in Photoshop’s Preferences, there’s an easy way to tell which of these options corresponds to which Auto command. Simply hover your mouse cursor over the name of an option to see a more detailed description of it. Notice that at the very end of the description, it actually says which Auto command it matches. In the case of this first option, Enhance Monochromatic Contrast, it shows Auto Contrast in parenthesis:
The Tool Tip tells us that Enhance Monochromatic Contrast is the same as Auto Contrast.
To select the option, simply click inside the little circle to the left of its name, then look at your image to judge the results. Here’s what my photo looks like with Enhance Monochromatic Contrast applied. The overall contrast is improved but the greenish color cast remains. If you compare it with the Auto Contrast result from the previous tutorial, you’ll see that both versions look exactly the same. The only difference here is that we’re applying Auto Contrast as an non-destructive adjustment layer rather than as a static adjustment:
The image with Enhance Monochromatic Contrast (Auto Contrast) applied.
The second option from the top, Enhance Per Channel Contrast, is the same as the Auto Tone command. Again to quickly recap, Auto Tone is similar to Auto Contrast in that it darkens the darkest pixels to black, lightens the lightest pixels to white, and then redistributes the other tonal values in between, but it does so on a channel-by-channel basis rather than a composite basis, so each individual color channel is treated differently. This not only boosts overall contrast but also changes the colors in the image. If your photo suffers from an unwanted color cast, Auto Tone may be able to correct it, but it could also just as easily introduce a color cast if there wasn’t one originally.
I’ll hover my mouse cursor over the Enhance Per Channel Contrast option to view a more detailed description of it, and we see at the end that it lists Auto Tone in parenthesis:
Enhance Per Channel Contrast is the same as Auto Tone.
I’ll select the option by clicking inside the little circle and here, we see the exact same result as we saw when I applied the Auto Tone command in the previous tutorial. There’s a nice boost in contrast over the original version, and some, but not all, of the greenish color cast has been corrected:
The image with Enhance Per Channel Contrast (Auto Tone) applied.
The third option, Find Dark & Light Colors, is the same as the Auto Color command, which also darkens the darkest pixels to black, lightens the lightest pixels to white, and redistributes the other tonal values in between on a channel-by-channel basis, just like Auto Tone. The difference with Auto Color is that it also tries to neutralize the midtones, giving us the best chance of removing an unwanted color cast.
I’ll hover my mouse cursor over the Find Dark & Light Colors option to view the description, and we see Auto Color listed at the end:
Find Dark & Light Colors is the same as Auto Color.
There’s one extra step here to recreating the same effect as Auto Color. In order to neutralize the midtones, we also need to turn on the Snap Neutral Midtones option by clicking inside its checkbox. Again, notice that if you hover your mouse cursor over the option to view the description, you’ll see that it lists Auto Color at the end:
Selecting the Snap Neutral Midtones option.
Here’s my result with both Find Dark & Light Colors and the Snap Neutral Midtones options selected. Just as with the Auto Color result in the previous tutorial, the overall contrast isn’t quite as strong here as what we saw with the previous two options, but the greenish color cast has been greatly reduced:
The image with Find Dark & Light Colors and Snap Neutral Midtones (Auto Color) applied.
Step 4: Combine “Snap Neutral Midtones” With The Other Options
One really great benefit of applying the Auto commands this way, rather than as static adjustments, is that we can actually combine the Snap Neutral Midtones option with any of the Auto commands, not just Auto Color! For example, I’ll leave Snap Neutral Midtones selected, but I’ll switch from the Find Dark & Light Colors option to the Enhance Per Channel Contrast option, effectively combining the Auto Color and Auto Tone commands:
Trying the Enhance Per Channel Contrast option with Snap Neutral Midtones selected.
And here’s my result. The overall contrast is greatly improved over the original thanks to the Enhance Per Channel Contrast (Auto Tone) option, and the color cast has been removed thanks to the Snap Neutral Midtones option. In fact, this is the same result as what we saw in the previous tutorial when I applied Auto Tone to the image immediately after applying Auto Color:
The image with Enhance Per Channel Contrast (Auto Tone) and Snap Neutral Midtones applied.
As I mentioned earlier, we’ll save the fourth option (Enhance Brightness and Contrast) for later when we look at Photoshop’s Brightness/Contrast image adjustment. Once you’ve tried all three options and chosen the one that works best for your image, click OK to close out of the Auto Color Correction Options dialog box. If you want to compare the corrected result with the original, simply click the adjustment layer’s visibility icon in the Layers panel to temporarily turn the adjustment layer off:
Clicking the layer visibility icon for the Levels adjustment layer.
With the adjustment layer off, you’ll see your original, uncorrected version in the document:
The original photo.
Click again on the visibility icon to turn the adjustment layer back on:
Clicking the empty square where the little eyeball used to be.
This returns you to the auto-corrected version:
The Auto-corrected result.