[gentoo-user] diff command for images

2008-01-27 Thread Erik
I need to find the difference between images (like the text-file diff command, but for RGBA images). I tried compare A.png A.png difference.png. This should obviously produce some kind of blank image because A.png and A.png are the same file, but for some weird reason the produced difference.png

Re: [gentoo-user] diff command for images

2008-01-27 Thread Elias Probst
Am Sonntag, 27. Januar 2008 14:54:15 schrieb Erik: I need to find the difference between images (like the text-file diff command, but for RGBA images). I tried compare A.png A.png difference.png. This should obviously produce some kind of blank image because A.png and A.png are the same file,

Re: [gentoo-user] diff command for images

2008-01-27 Thread Erik
Elias Probst skrev: Am Sonntag, 27. Januar 2008 14:54:15 schrieb Erik: I need to find the difference between images (like the text-file diff command, but for RGBA images). I tried compare A.png A.png difference.png. This should obviously produce some kind of blank image because A.png and

Re: [gentoo-user] diff command for images

2008-01-27 Thread Jens Krahe
Am Sonntag, 27. Januar 2008 schrieb Erik: I tried compare A.png A.png difference.png. This should obviously produce some kind of blank image because A.png and A.png are the same file, but for some weird reason the produced difference.png has recognizable content! Try compare -metric AE A.png

Re: [gentoo-user] diff command for images

2008-01-27 Thread Willie Wong
On Sun, Jan 27, 2008 at 02:54:15PM +0100, Penguin Lover Erik squawked: I need to find the difference between images (like the text-file diff command, but for RGBA images). I tried compare A.png A.png difference.png. This should obviously produce some kind of blank image because A.png and A.png

Re: [gentoo-user] diff command for images

2008-01-27 Thread Ralf Stephan
You could also try the pamarith comand of the netpbm package. It has both -subtract and -difference ralf -- gentoo-user@lists.gentoo.org mailing list