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As I have mentioned in the last movie, it looks like you can choose color settings out of the Edit menu and change the current RGB and CMYK settings for the current document. This document that's open right now, but you really can't. These values only change the future documents that you create. So I am going to cancel out of there. Instead if you want to change the default RGB and CMYK settings for a document, you have to use either Assign Profile or Convert to Profile down here at the bottom of the Edit menu. Let's look at each of those in turn. Assign Profiles lets you tag your document with a different set of RGB and CMYK profiles. For example, I could change my RGB to something else other than SRGB or I could change my CMYK profile for this document from Web Coated to maybe Sheetfed Coated. I could even discard the profile of RGB or CMYK entirely although it is very, very rare that you would ever want to do that. Now assigning a new working space profile is like saying the colors in this document now mean something different because cyan now looks like this and magenta now looks like this and so on. That is why when you assign a different profile, the colors that you see on screen will almost certainly change, even though the numbers behind the colors, the definitions of the colors will not change.
You can see this pretty easily with a Preview check box. I will move this out of the way and I will turn on the Preview check box and you can see that all the colors in the document changed just a little bit. If we choose a different CMYK profile, something really different like newspaper, then you can see they change a lot. Let us see a before and after with the Preview check box off. That is the way it used to look. With the Preview check box on, you can see they really change. I have actually changed the meaning of cyan, magenta, yellow, red, green, blue and so on and so even though the numbers are the same to make up those colors, they look different on screen.
I am going to cancel out of this and show you Convert to Profile. Edit > Convert to Profile, here we go. Now Convert to Profile is actually the opposite of Assign Profile. It converts all the colors it can in your document to match the specs in the New Profile and it tries to maintain the look of you colors, not the definitions. That is, it will change the numbers in order to make them look as close as it can to the original. Let's move this out of the way and I will show you what I mean. With the Preview check box turned on, I am going to change the CMYK profile to something different, let's say Sheetfed Coated. You can see that the colors changed maybe a hair but not that much, But if we look in the Swatches panel, you can see that some things changed a lot. What was all at 100% cyan is now 97% cyan and 2% yellow. All of these CMYK numbers changed because it was trying to match the color in this new CMYK profile. You obviously need to be really careful when choosing Convert to Profile. It can totally mess up your documents.
Now on the other hand, Convert to Profile is pretty useful for finding out which RGB and CMYK profiles are currently assigned to this document. In fact, if somebody sends me a document, I will often open the Convert to Profile dialog box just to find out what RGB and CMYK profiles are assigned to that document. It is really the only good way for me to figure that out. Then I cancel out of it and if I needed to change it for some reason, I would probably use the Assign Profile feature instead. Now in the next movie, we will take a look at how you can import RGB images into InDesign and why that's not a bad idea at all.
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