Legacy ImageMagick Discussions Archive

I worked around it in the end by using the neat PHP JPEG Metadata toolkit Does your method hash the pixel data or the jpeg compressed data? I believe it is the JPEG compressed data - I can't recall (& don't have time to check - sorry!) but I believe the PHP JPEG Metadata Toolkit just pulls the data ...

Is this now considered stable and unchanging, or will it be subject to change in the future? If I want to store the image signature of many millions of images in a large and long-term database, how sure can I be that future upgrades of ImageMagick will still produce signature hashes that can be ...

No problems, assumed it was something like that. Thanks for the reply.

Hi, I've just discovered the 'signature' field reported by the "identify" command line tool after looking for a way to compare a set of images with known properties - the same JPEG image data but different EXIF fields. I thought it'd be a great way to identify duplicate images but from initial ...