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An easy but professional method to achieve good color correction is a method called the two-pass color correction. This will allow me to adjust an RGB image and then bring the colors more in range with the CMYK workflow. First, we'll review the method using levels, and then I'll show you a great way to get a live preview of proofing the colors using split windows. So, here we have my image and it's a pretty good starting image, but I need to adjust the color just a little bit to get a little more contrast and deepen the turquoise just a bit. Working non-destructively, I'm going to open my levels adjustment layer.
And again, this gives me a histogram showing me my shadows, mid tones, and highlights, but this view right now is a composite of the RGB image. In order to achieve color correction for this, I'm going to go into the individual channels for red, green, and blue and adjust accordingly. Starting with the red, I see my history in here with shadows, highlights, and mid tones. What I'm looking for is for the histogram to reach the shadows and highlights range on both sides. In this case, the red channel looks pretty good. So, then I'm going to go to the green channel and check for that.
The green channel does look a little low, so I'm going to grab my shadow slider and pull it to the beginning of the histogram on the left and my highlights, so the beginning of the histogram on the right. Then, I'll go to the blue channel and adjust accordingly. This is the first pass of the two pass color correction method. The second pass is actually color balance, just like we talked about in the other movie. In color balance, I can go into my mid tones on the red channel. And on the left, I have red, on the right, I have cyan, and I can start to balance this out. And then I go to my green channel, and on the green channel, I have green and magenta.
And then finally, on my blue channel, I have blue and yellow. So, I can go through and adjust accordingly. And this looks pretty good, I've got a terracotta behind this. My turquoise looks a little deeper, I popped some of the colors down here almost the other sides of the jewelry. That looks pretty good. So, that's the initial start of a two pass color correction. Now, to preview this and see what it will look like as CNYK, what I can do is go to my Window menu to arrange and I can say New Window for Jewelry Set.
And when I select that, it's going to give me a second window. It's a mirror. It's just a copy of my other file. If I go to Window> Arrange, I can then tell it to Tile All Vertically, and it puts it as a two-up window. Now, this is exactly the same. If I make a selection in this window, the selection will show up in this window as well. What I can then do is tell it to proof the colors. And the Proof the Colors will show me in one of my windows, a CMYK preview. So I can see what this looks like as CMYK before I commit to it as I am doing my color correction.
So, over here I can come back over, double-click on Levels, and check my adjustments and as I go through and adjust, I can watch a preview as a CMYK document.
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