Legacy ImageMagick Discussions Archive

I have several hundred images of varying sizes and orientations. I need to trim them for a project.

Each has a short (~30px) white border across the bottom which contains the filename in gray text. The height of the border varies by a few pixels between images.

I'd like to trim this bottom border off. I did a quick 'n' dirty -chop just to get going on the project but I'm losing between 1-5 pixels from some images.
Is there a way to detect the white area at the bottom, given that it contains gray text also?

Can I scan down the lines until I find a solid white line then chop from there?

Reference image:

Being JPEG, you won't get solid white.

I crop the left-most column, turn all pixels that aren't within 2% of white into black, add a 1-thick black border all the way round, and find what I would get from trimming the (black) border. The result would be 1 pixel wide and 27 high.

Thanks snibgo, I'll give that try and see what I get.