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Is there a way to use a guide overlay similar to the crop tool, but with the marquee tool?

I'm trying to crop to a specific aspect ratio and the marquee tool seems to be the only one that can do that.

Any advice?

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With the rectangular marquee tool you can change the style between Normal, Fixed Ratio and Fixed Size. The latter two options should achieve what you're after.

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I'm looking for the guides that get shown when doing cropping. Like the "rule of thirds" guide. – Jeremy Cantrell Jul 16 '10 at 4:58

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