> -----Original Message----- > From: Roy Britten [mailto:[EMAIL PROTECTED] > Sent: Friday, 11 August 2006 3:37 p.m. > To: [email protected] > Subject: Re: diff for images > > On 11/08/06 13:20, Volker Kuhlmann wrote: > >> Can anyone recommend a tool or script that will take two images and > >> produce a third image, where the RGB value of each pixel > in the output > >> image is the difference of the corresponding RGB pixel > values for the > >> input images? > > > > ImageMagick > > Initially I'd tried 'identify -verbose file' to spot that image > differences were present, and 'compare a b c' which doesn't really do > what I wanted. > > Prompted by a couple of "use ImageMagick" responses I've fiddled about > some more and come up with 'convert a b -compose difference > -composite' > which seems to do the trick. > > Was this what you were thinking? > > Cheers, > Roy.
Used both before for different requirements. Compare is more mathematical in nature - ie. What are the differences between a sharp and fuzzy image? Convert can do almost anythuing but is more computationally expensive. Must admit that, like you have mentioned, I've found convert to be the more useful of the tools.
