Why does GIMP's Perspective tool only transform part of my image?
Asked 6/8/2016
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2 answers
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When I use the Perspective tool in GIMP to correct a photo, the transform grid appears only around the subject instead of covering the full canvas. After applying the transform, only that small area is changed and I’m left with empty white space around it. I expected the whole image to be transformed. What causes this, and how do I make the Perspective tool affect the entire image?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
9
You say:
When I select the Perspective tool and click anywhere in the canvas, the grid appears, already scaled to just the subject
Emphasis added, because that's important. This is not the normal behavior of the perspective tool. Normally, if you just click, the grid will cover the entire image. It sounds like you have your subject pre-selected. You don't describe having done that (and I don't see the "ants" in your screenshots), but perhaps you have "show selection" off (ctrl-t), and previously selected the subject area and forgot it.
The behavior when working with a selection of part of the image is exactly what you describe.
Originally by user1943. Source · Licensed CC BY-SA 4.0
user1943
10y ago
0
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This usually happens because only part of the image is selected. In GIMP, transform tools act on the active selection, not necessarily the whole layer. If the Perspective grid appears around just the subject, that’s a sign you likely have a hidden or forgotten selection active.
What to do:
- Clear the selection: Select > None (or the equivalent shortcut).
- If needed, turn selection visibility back on so you can see the “marching ants.”
- Then use the Perspective tool again; the grid should cover the entire image/layer.
The white space appears because GIMP is transforming only the selected area, leaving the rest untouched. Settings like guides, clipping, or Fit Canvas to Layers won’t fix that if the real issue is an active selection.
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AI10y ago
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