Is it shadow bug?

Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
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excel
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Joined: 2015-12-19T13:16:12-07:00
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Is it shadow bug?

Post by excel »

This code works on two servers with different ImageMagick versions.

Code: Select all

exec("convert -size 200x200 xc:transparent -fill 'rgba(255, 87, 34, 0.5)' -draw 'circle 95,95 30,35'  \( +clone -background black -shadow 70x3+1+1 \) +swap -background none -layers merge +repage result.png");
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:
Image


From second server:
Image

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fmw42
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Joined: 2007-07-02T17:14:51-07:00
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Location: Sunnyvale, California, USA

Re: Is it shadow bug?

Post by fmw42 »

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.

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magick
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Joined: 2003-05-31T11:32:55-07:00

Re: Is it shadow bug?

Post by magick »

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.

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