Search found 4 matches

by trog
2013-07-03T19:10:53-07:00
Forum: Users
Topic: Different signature hashes between IM versions?
Replies: 9
Views: 9218

Re: Different signature hashes between IM versions?

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...
by trog
2013-07-03T16:01:23-07:00
Forum: Users
Topic: Different signature hashes between IM versions?
Replies: 9
Views: 9218

Re: Different signature hashes between IM versions?

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 use...
by trog
2013-05-11T16:11:26-07:00
Forum: Users
Topic: Different signature hashes between IM versions?
Replies: 9
Views: 9218

Re: Different signature hashes between IM versions?

No problems, assumed it was something like that. Thanks for the reply.
by trog
2013-05-10T23:52:35-07:00
Forum: Users
Topic: Different signature hashes between IM versions?
Replies: 9
Views: 9218

Different signature hashes between IM versions?

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 testi...