Bash: Fill color on specific part of image

Question

I am looking for a way to batch process images in bash.

Is there any way to fill up specific part of image?

Example:

I want to fill up the red part with white color. The red part is always on the top left corner, size is 135x35px.

Yes, Gimp/Photoshop is one way to do this, but I have lot of images and I love automatize things with bash.

Answer 1

Sure, use ImageMagick - installed on most Linux distros and available for OSX and Windows.

convert input.png -fill white -draw "rectangle 0,0 135,35" result.png

If you have many files, make a COPY in a spare folder and try this and it will probably do them all

mogrify -fill white -draw "rectangle 0,0 135,35" *.jpg