Legacy ImageMagick Discussions Archive

Right, but one could introduce an offset parameter, declare QuantumRange/2 as zero, or accept an optional second raster image representing the negative part.

Yes precisely, it appears IM takes the absolute value of the NCC, which is not what I want (who ever does, I wonder ?). In the meantime I turned to the -morphology Convolve operator as a replacement for -subimage-search, because the object I want to detect can be described as linear combination of ...

Hi, -subimage-search of two grayscale images provides a correlation map, but correlation and anti-correlation cannot be distinguished. I would like a way to keep the sign of the ressemblance. To give an example, here is a search for a bright disc (p.png) in an image containing a white and a black ...

Thanks a lot for the reply. I was hoping I had missed something when browsing the documentation, that would have made things easier, but your solution is perfectly acceptable, so I'll go the way you suggest. It may be slightly more efficient to generate only a single map of maximal values, then ...

Dear ImageMagick users, When applying the operator Max to a sequence of color images, such as in convert -size 100x100 radial-gradient:'#FF0000'-black \ -size 100x100 gradient:black-'#0000FF' \ -size 100x100 gradient:'#00FF00'-black \ -evaluate-sequence max \ show: it appears that the operator is ...