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When most people think of color correction, they automatically think of a Curves or Levels eyedropper adjustment, but there are so many other methods of color correction that aren't as well known and may not be thought of right away, such as a Levels Channel adjustment. Once you've opened your image in Photoshop, duplicate the layer by pressing Ctrl+J on a PC, Command+J on a Mac. Now go to the bottom of the Layers panel and select the half-black, half-white circle, the Create a new fill or adjustment layer button, and select Levels.
Now go up to the dropdown box marked RGB, to your channels, and select Red. What we want to do is move these sliders so they go into the most information per channel in the histogram. So in this case we'll move the Black channel over towards the right, go back up, select the Green channel--in this case all the histogram values toward the middle-- so we'll move both the Black and the White sliders and go back up and select the Blue channel and in this case we'll move the White slider over toward the left.
You can see a marked improvement. You can also select your Auto button and use that as a starting point, or if you like it, you can end there. But with working in channels, you get this great control, being able to move your sliders and find the tonal values you really like by channel. You can move your black, your white, and your midtone points, darken and lighten to your heart's content.
Making your color adjustments by channel and levels gives you more control than just hitting the Auto button, and can also give you a totally different result than using the Eyedropper tools. It's just one more method to try when adjusting color and getting rid of colorcasts.
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