I am currently working with batch image processing and trying to figure out such thing: is it possible to access Photoshop's guidelines on image? I have a lot of background images with guidelines placed on them and want to combine with other images, using coordinates marked by guidelines. Is it possible at all?
if you don't stick to use ImageMagick..
layervault/psd.rb: Parse Photoshop files in Ruby with ease
-> examples/guides.rb may solve
meltingice/psd.js: A Photoshop PSD file parser for NodeJS and browsers
are able to parse psd file.