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PS is 0.1 degrees from my tests. It rounds the number, so it actually "switches over" at the 0.05 point.

I can crop very quickly in PS. Don't use the crop tool, it's terrible. I do this:

- Marquee tool (M)
- Zoom to fit whole image (Control-0)
- Select the whole image (Control-A)
- Drag the top-left of the selection near the top-left point
- Zoom in on the top-left point (I press control-alt-0 and jump there with the navigator)
- Scroll across the top and left edges to confirm the positioning, and adjust the crop point precisely with arrow keys. (Keyboard: PageDown/PageUp/Control-PgDn/Control-PgUp. Or, hold shift and drag the navigator around.)
- Image->Crop to crop to the selection
- Repeat for bottom-right

It's very fast and precise.

I don't get why many people are sticking with only one tool. at least, I need PS, Gimp, SAI, Xnview.
Switching tools is a pain, and GIMP's UI is so awful I never want to use it.