Crop based on clolor

[frazior]

is it possible to crop the number in the middle of the frame and get something like this :

maybe crop the black pixels surrounded by white ?

[fmw42]

I do not see an automatic way, since your image is very grainy, compressed and the colors are too close to your "black" which is not really black.

Closest I have come to isolate the "black" letters is:

Code: Select all

convert majick.jpg -morphology smooth octagon:1 -fuzz 5% -fill white +opaque "rgb(65,65,65)" -trim +repage result.png