Feature request: Auto-crop image

[magick]

The only reason I still have IrfanView installed (therefore limited to win32 sandbox)…

I can think of two possible extension options:
- trim from selected frames only (top, bottom, left, right)
- trim when pattern changes (rather than detecting first if pixels adjacent to the frame have the same color and then detecting how wide the same area towards the centre is - this would be detecting just the break in the pattern so therefore could support multiple different colors initially adjacent to the frame. For instance, image:

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RRRRRGGGRRRRRRRR
RRRRRGGGRRRRRRRR
RRRRRGGGRRRRRRRR
RRRRBGGRRRRRRRRR
RRRRBGGRRRRRRRRR
RRRBBBGGRRRRRRRR
RRBBBGGGGRGRRRRR
RBBBBBBRRRRRRRRR

would result in:

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RRRRBGGRRRRRRRRR
RRRRBGGRRRRRRRRR
RRRBBBGGRRRRRRRR
RRBBBGGGGRGRRRRR
RBBBBBBRRRRRRRRR

when crop from top only.

and in:

Code: Select all

 RRBBBGGRRR
 RBBBGGGGRG
 BBBBBBRRRR

when crop from all directions.

whereas default trim (like in IrfanView) would result in:

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 RRRRGGGRRR
 RRRRGGGRRR
 RRRRGGGRRR
 RRRBGGRRRR
 RRRBGGRRRR
 RRBBBGGRRR
 RBBBGGGGRG
 BBBBBBRRRR

(just left & right as those had one a same R-color adjacent to the frame initally)