possible -alpha Shape bug

Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
Post Reply
jwebst
Posts: 1
Joined: 2017-05-03T19:27:46-07:00
Authentication code: 1151

possible -alpha Shape bug

Post by jwebst » 2017-05-03T19:40:15-07:00

I believe I may have the same issue that was reported as solved in a previous post https://www.imagemagick.org/discourse-s ... pe#p139313.

Input:
Image

Code: Select all

convert alpha_extract.png -background blue -alpha Shape alpha_shape.tiff
convert alpha_extract.png -background blue -alpha Shape alpha_shape.png
Both of these commands result in solid blue fields on ImageMagick 7.0.5-4 Q16 and ImageMagick 7.0.5-5 Q16 for OSX

User avatar
fmw42
Posts: 21863
Joined: 2007-07-02T17:14:51-07:00
Location: Sunnyvale, California, USA

Re: possible -alpha Shape bug

Post by fmw42 » 2017-05-03T19:55:14-07:00

These commands work fine for IM 6.9.8.4 Q16

Code: Select all

convert moon.png -background red -alpha shape moon_red.miff

Code: Select all

convert moon.png -background red -alpha shape moon_red.mpc

Code: Select all

convert moon.png -background red -alpha shape moon_red.png

However, they produce a solid red image for IM 7.9.8.5 Q16 Mac OSX Sierra

Code: Select all

magick moon.png -background red -alpha shape moon_red.miff

Code: Select all

magick moon.png -background red -alpha shape moon_red.mpc

Code: Select all

magick moon.png -background red -alpha shape moon_red.png
So there is a bug in IM 7.0.5.5

User avatar
magick
Site Admin
Posts: 10684
Joined: 2003-05-31T11:32:55-07:00

Re: possible -alpha Shape bug

Post by magick » 2017-05-06T12:45:19-07:00

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ http://www.imagemagick.org/download/beta/ by sometime tomorrow.

User avatar
fmw42
Posts: 21863
Joined: 2007-07-02T17:14:51-07:00
Location: Sunnyvale, California, USA

Re: possible -alpha Shape bug

Post by fmw42 » 2017-05-08T12:23:50-07:00

I am still getting a solid red image for the PNG command in the latest beta as of today. The MPC and MIFF work fine.

Code: Select all

im7beta magick moon.png -background red -alpha shape moon_red.png

User avatar
magick
Site Admin
Posts: 10684
Joined: 2003-05-31T11:32:55-07:00

Re: possible -alpha Shape bug

Post by magick » 2017-05-08T17:03:13-07:00

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ http://www.imagemagick.org/download/beta/ by sometime tomorrow.

User avatar
fmw42
Posts: 21863
Joined: 2007-07-02T17:14:51-07:00
Location: Sunnyvale, California, USA

Re: possible -alpha Shape bug

Post by fmw42 » 2017-05-10T09:52:54-07:00

Thanks. It seems to be fixed for the PNG result in today's beta

Post Reply