crop black border

[lele-brz]

Hi,
I'm new to ImageMagick, I'm usign this (actually RMagick) to generate thumbnails.
I can do that very easily but I would like to trim black borders (letterbox) if present in the source jpg.
Is there a function for this, or a way to do that?
I could access pixel by pixel and understand where to crop, but I don't know how to do that.
Thanks in advance

bye

[Bonzo]

I do not know about Rmagick but -trim should do it.
http://www.imagemagick.org/script/comma ... s.php#trim

[lele-brz]

Thanks, I'll try that.
What I don't know is what would happen if I have a black image with just a writing in the center.

[anthony]

it will crop the image so the text is all touching the borders of the resulting image.