Legacy ImageMagick Discussions Archive

Hi all,

I'm on version 6.8.9-9 Q16 x86_64 on Ubuntu.
I have a lot of images which are divided into two or more images, separated by a white column in the middle.

http://jessytucky.nl/imagick/img.jpg

Also, all these images have a white border.

Is there a way to detect a splitting white column in the middle (no matter the width of the column)?
Or, say, print a number of vertical white columns to the command line?

I just need to know if there's a column in the middle. I don't need to do any adjustments.

In this case it would be 3, because the left and right border would also account for a vertical white column.

Any help would be greatly appreciated.

Thank you

You can trim the image, threshold it to binary, scale the image to one row, then search for any white pixels.
If this returns nothing, then there is no white area in the middle; otherwise if a spacer, it will show something like:

Hi Fred,

Thanks a lot! You definitely helped me on my way.
I ended up cropping a column with a width of 2 px from the center of the image, turned all pixels into black and white with a little fuzz and checked with grep if black = 0. If so, it is a white spacer. Works like a charm!