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So here we're looking at the CMYK version of the image, or we will be in a moment. This is actually a still and RGB image, and I can tell because it tells me right there in the title area. But, I want to see how this image gets to be CMYK because your images are not going to start out as CMYK, and at what point they get converted to CMYK is very much up for debate, depending on the kind of workflow that you choose. I will be talking about that in the movie on color management. But, for now, suffice to say that this needs to get converted to CMYK, and this is how we do it.
It's one way we do it. There is another slightly more involved way, but for now, this is the easiest way. I am going to click OK, and you might have noticed a slight shift in colors. This is a destructive process. It's a one-way process. There is no going back on this. If we were to convert this back to RGB, we wouldn't regain anything that we had lost. But, if we now look at the channels, we have four channels as opposed to three. Because CMYK has a smaller color gamut, i .e. because there are fewer CMYK colors than there are RGB colors, your colors may look a little bit more dull than they did when you were working with RGB colors.
Because we have four channels as opposed to three, your file size will be a little bit bigger than it was. I am just going to press Ctrl or Command+Z to undo that. We go from 3.12 MB to 4.16 MB in file size. Another characteristic of CMYK images is that some of your filters will not be available for you. Some of these filters only work in RGB images.
Another characteristic of CMYK images is that when we edit them, and I'm going to apply a curves adjustment to this as I did to the RGB version in the previous movie. Here, when we move the curve up, because this is a subtractive color space, when we move the curve up, we are adding ink, and things get darker. When we move the curve down, we are removing ink, and things get lighter. Our color channels for a CMYK image are measured not on a scale of 0 to 255, but with ink percentages of 0 to 100.
If I come and mouse over the image, we can see that in the lighter areas, the values are less and in the darker areas, the values are more.
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