>GIMP 2.8.4 Windows 7 64-bit
>Using the native GIMP rotate function to rotate a rectangular image
>about its centre (for instance) the corners of the image which are
>exposed by the rotation are set to RGB 0x000000 with an alpha value of
>0.so that these areas are transparent.
>If the same operation is performed as a GEGL operation the corners
>have RGB values of 0x000000 but alpha values of 255 - i.e. they are
>solid black.
>Is there a setting to cause GEGL to use alpha values of 0 for these
>This also applies to GEGL operations such as shear.

Adding an alpha channel causes the areas exposed by the rotation to have a
graduated transparency. Problem solved.

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