|In this Photoshop tutorial we're going to remove a tan line on someone's skin. |
Some people advice to correct an image like this in Photoshop with the clone or healing brush tool, but there are important issues when you use that approach:
In this Photoshop tutorial we try to solve the problem using color samplers and a levels correction in combination with a mask.
1. Correct color and brightness
This image will open in RGB mode, but we're going to work in Lab mode; in the menu select Image / Mode / Lab Color.
Select the Magic Wand tool in the tool bar and use all the settings that I've marked in this screenshot:
Now select the area that needs to be corrected. You might want to zoom in. Hold down the shift key during every click to include all those areas that the magic wand ignored:
Click on the Create new fill or adjustment layer icon at the bottom of the layers palette, hold down the mouse button and select Levels... and click on OK. Later we will return to this Levels adjustment layer to make the actual adjustments.
Select the Color Sampler tool in the tool bar (if you can't find it, then it's hidden underneath the Eyedropper tool)
In the option bar select for Sample Size a 5 by 5 Average:
Click on the bottom layer that contains the photograph to make it the active layer (a brush icon will appear in front of it).
Click with the mouse once on the area marked with the blue dot and once on the area marked with the green dot:
Open the Info Palette.
You'll notice the two Color Sampler points number 1 and 2 that we just placed on the skin.
The numbers Photoshop's Info Palette show the color (a and b) and luminosity (L) or brightness values of the areas that are marked with these two Color Sampler points. Notice that in front of the L (Luminosity) value we have the number of the color sampler (#1 on the left, #2 on the right).
It's our goal to match the numbers for a and b of Color Sampler point #2 with the a and b values of the Color Sampler point #1and we do this with the Levels adjustment layer that we added earlier.
Double click on the thumbnail of the Levels adjustment layer to open the Levels window.
Select the a channel at the top of this window.
Move the white slider to the left until the value at A in the info palette is the same as the value at B:
Now select the b channel at the top of this window.
Again, move the white slider to the left until the value at A in the info palette is the same as the value at B:
Select the Lightness channel at the top of this window.
Move the gray slider to the right, until the the skin at the bottom matches the skin at the top (ignore the info palette):
It doesn't have to be extremely accurate for the moment. Ignore the darker edge between the two Color Samplers, only focus on the skin that's further away from this edge. With a value of 0.61you're going to be pretty close to what the actual value has to be (Input Levels, center box).
Tip: take a real pencil and hold it over this edge on your monitor, this will make it easier for you to make the adjustment.
Continue on the next page.