Legacy ImageMagick Discussions Archive

This code works on two servers with different ImageMagick versions.
Both servers based in Debian operating system.

First server:
ImageMagick 6.9.2-7 Q16 x86_64 2015-12-03

Second server:
ImageMagick 6.8.9-9 Q16 x86_64 2015-01-05

Why the different results?

From first server:



From second server:

I can confirm the difference using IM 6.9.2.10 Q16 and 6.8.9.9 Q16 Mac OSX Snow Leopard. I know there was some partial transparency blending changes not too long ago, but do not know if this is related. The change seems to have occurred between 6.9.1.6 and 6.9.1.7.

It appears to be a transient problem which fixed in recent releases of ImageMagick. The current release, ImageMagick 6.9.2-10, returns similar results to your first image, res1.png. The normalized RMSE metric for 6.9.2-10 vs 6.9.2-7 is 5.8503e-06, whereas for 6.8.9-9 vs 6.9.2-7, we get an RMSE of 0.0323784.