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So every once in a while you might run into a weird behavior when it comes to guides, when you are resizing a document. So let me walk you through that. Let's get up set up together in case you are following along. I am going turn on my Rulers, Command +R, Ctrl+R, and if you don't see any guides in this document, just turn your guides on, Command+Semicolon or Ctrl+Semicolon. I can see there are some guides in this document already. Now I have also got these guides locked. So normally they are not locked by default, but I have turned this on. I have locked my guides. Let's go to Image > Image Size now and we are going to make this half as big. So we'll just make it 600 pixels wide in our Width field here. I'm going click OK. And do you see what happened? It kind of looks funky. Here is before and here is after.
And it turns out that when your guides are locked they don't scale in proportion to the image. They actually stay in their fixed relative position, before you did the Image Size. So I'm going to undo that. If someone argues that's a feature, I would say it's a kind of weird behavior, but it kind of makes sense conceptually. If you turn the guides to be unlocked, so we'll turn that menu command off, the guides are now not locked and I can verify that by putting my cursor on the guide and I'll get this special move cursor for guides. By the way, that has a shortcut as well. Command+Option+I or Ctrl+Alt+I, to open up Image Size. This time we'll type in 600 again for the width and click OK.
Now I think you are probably going to get what you more expected. Your guides scaled in proportion to the Image Size as well. So I still have my guide at the middle line vertically and then a guide at the middle line horizontally as well. So just a little nuance there. When your guides are locked they do not scale with the document. If you want to make them scale with the document, make sure they are unlocked and you'll get what you expect.
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