Imagine that you are making a collage out of several photos and would like
to lilt them a little bit :)

2012/2/5 Erik P. Olsen <>

> On 05/02/12 13:37, Noel Stoutenburg wrote:
>> Erik P. Olsen wrote:
>>> Why can't I rotate images similarly with Gimp?
>> and I concur with the answer that BK gave, as far as it went. But to
>> expand a
>> bit, there are several ways to rotate an image. For the purpose Erik
>> mentioned,
>> I'd use the method BK mentioned:
>> Image > Transform > Rotate...
>> This is the equivalent of rotating the substrate upon which the image
>> lies.
>> There is a second way, useful when one wants to modify some part (or all)
>> of the
>> image with respect to the substrate.
>> Layer > Transform > Rotate...
>> acts similarly to the method BK described, except that it rotates the
>> layer
>> containing the image, or some part of it, with respect to the rest. If
>> one has
>> an image that has unequal dimensions, like a rectangle or oval, and
>> rotates the
>> layer relative to the substrate (canvas is the term GIMP uses), then part
>> of the
>> layer is no longer over the substrate. This gives a result similar to
>> what the
>> OP describes: part of the image is no longer over substrate, and gets
>> lost.
>> A third method works similarly to the method of the layer transform: the
>> Rotate
>> tool in the toolbox. The rotate tool will rotate a selection of the image
>> (which
>> may, but need not necessarily coincide with an image) and rotate that
>> selection
>> relative to the remainder of the image. And just like the layer transform
>> I
>> describe above, there is a risk that a selection with unequal dimensions
>> will
>> lose part of the information.
>> It turns out, though, that even if one seems to have lost the information
>> by
>> choosing layer or selection rotation instead of image rotation, that
>> besides
>> undo, there is a convenient way to recover the information no longer over
>> substrate. One can resize the canvas. Once the canvas is resized with the
>> dimensions of the image again matching the dimensions of the rotated
>> part, the
>> full image again becomes visible.
> Thanks for this detailed description. Yes, I've rotated the layer only, so
> now at least I know how to rotate correctly. But please enlighten me why
> would you want to rotate a layer and not the entire image?
> --
> Erik
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