Hello all,

gimp 2.7.5 on winXP, unfortunately. New hardware problems on my freebsd system. grr. Anyway...

Why won't the gimp allow me to use a difference of gaussians on a layer mask? This seems like a perfectly fine thing to do for edge detection, and indeed, other edge-detect algorithms work:

For example:
  New layer mask, from grayscale copy of layer
  Filters / edge-detect / difference of gaussians says:
    Execution error for 'Difference of Gaussians':
    Can operate on layers only (but was called on channel or mask).
  Filters / edge-detect / Edge...
    works fine

Is this a bug, or am I missing something?
Any insights would be appreciated,

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