Legacy ImageMagick Discussions Archive

After more experimentation, it seems that "compare" with "-metric ae" does exactly what I want and reports the number of pixels which differ in any way. Maybe this is what fmw42 was getting at, but initially I misunderstood that. Thanks again for all the help, I think I'm good to go now :)

Thanks for the replies. I don't believe I was clear about what I need; I apologize. Please let me try to elucidate what I am after :) I want to compare the entire image, pixel-by-pixel. However, when I do this, I don't want to "skip" transparent pixels (I *think* that's what's happening, but I may ...

Hi folks, I'd like to compare two images on the alpha channel as well as the RGB channels -- I don't care about getting an output image, but only a numerical output that is non zero if there is any difference in the red, green, blue, and/or alpha channel from one image to the next. I've tried all ...

I'm not surprised that you get it to run correctly on Linux, since that has been my experience as well: The application has been tested to run perfectly on several Linux boxes and 32-bit Macs, but when run on 64-bit Mac OS X Lion (other 64-bit Mac OS releases have not yet been tested), the ...

Another update: I have further determined that one sure-fire way to make it (liable to) hang is with a polygon of at least 16 points, of which *all* the points have *exactly* the same coordinates. If even one single point differs from the others in either coordinate, there will be no problem. Also ...

Update: Apparently the issue is connected to the OS release; I have just tested on a 64-bit Snow Leopard (Darwin 10.8) machine and did *not* get the failing behavior. Also, I have managed to narrow the cause somewhat; it seems to be the case that if you give ImageMagick polygons whose vertices have ...

Hello all, I am developing an application which renders a very large number of many-vertex polygons onto a map image. I'm using ImageMagick to do the drawing, and I'm experiencing a very bizarre problem. The application has been tested to run perfectly on several Linux boxes and 32-bit Macs, but ...