One more command example in the docs doesn't work as intended

[lkintact]

ImageMagick version

7.1.1-39 Q16-HDRI x64 18ae555:20241005

Operating system

Windows

Operating system, version and so on

10 Home

Description

There's another command example at https://www.imagemagick.org/Usage/masking/ that doesn't work as intended: magick alpha_extract.png -alpha copy alpha_copy.png.

1. Download the original image, alpha_extract.png:
   
2. Execute magick alpha_extract.png -alpha copy alpha_copy.png; notice that the resulting image, alpha_copy.png, differs from what is shown in the docs:
   This is the result from the docs:
   
   This is what I get:
   

Steps to Reproduce

.

Images

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[VishwanthReddyD]

Its working fine. I got the below output for the same image input that I downloaded from the docs.

For me as i installed ImageMagick 6, I used convert alpha_extract.png -alpha copy alpha_copy.png instead of magick alpha_extract.png -alpha copy alpha_copy.png

[lkintact]

For me as i installed ImageMagick 6

But why install ImageMagick 6 when version 7.1.1-39 is available?

[fmw42]

IM 7.1.1.39 is producing the wrong output. Consider:

magick moon.png -alpha extract alpha_extract.png

magick alpha_extract.png -alpha copy alpha_copy.png

There should be transparency, but it is not here.

If I use 6.9.13-17

convert alpha_extract.png -alpha copy alpha_copy-2.png

Which has transparency, though one cannot see it well on a white background. But it is obvious when downloaded and viewed.

This is the same image that is displayed on the https://usage.imagemagick.org/masking/#alpha page.

So IM 6 is correct and IM 7 is not and is missing the transparency from the -alpha copy.

[urban-warrior]

Thank you for reporting the issue. We have successfully reproduced it and are actively working on a patch to resolve it. You can expect this patch to be merged into the main GIT branch, later today. As part of our commitment to quality, this fix will also be included in the upcoming beta releases of ImageMagick by tomorrow. Your patience and feedback are greatly appreciated.