+quality always throws InvalidArgument error

[fthiel]

Hello,

I tried to use the +quality option but regardless if I use it without a value or with a value I get the following message:

magick: InvalidArgument '+quality' '(null)' at CLI arg 2 @ error/operation.c/CLISettingOptionInfo/1243.

Is this a bug or is this correct an I'm doing something wrong?
What exactly is the effeect of +quality? My first assumption was it resets the quality setting.

[snibgo]

Why do you think "+quality" is a valid IM option? Is it documented somewhere?

[fmw42]

Please, always provide your IM version and platform when asking questions, since syntax may differ.

Also provide your exact command line and your images, if possible.

See the top-most post in this forum "IMPORTANT: Please Read This FIRST Before Posting" at http://www.imagemagick.org/discourse-se ... f=1&t=9620

If using Imagemagick 7, then see http://imagemagick.org/script/porting.php#cli


For novices, see

http://www.imagemagick.org/discourse-se ... f=1&t=9620
http://www.imagemagick.org/script/comma ... essing.php
http://www.imagemagick.org/Usage/reference.html
http://www.imagemagick.org/Usage/
https://github.com/ImageMagick/usage-markdown
https://imagemagick.org/script/porting.php#cli

[GeeMack]

Why do you think "+quality" is a valid IM option? Is it documented somewhere?

I don't know anything about a "+quality" option, but it does show in the list from this command...

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convert -list command

It shows up in the list from several versions as recently as 7.0.8-14. I've tried various commands, and I get the same error as the OP with v6.9.10-11 and v7.0.8-14, but I get no error with v6.8.9-9 in a bash shell on Windows.

I could see it being useful in a command like this...

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convert input.png -quality 100 -resize 50% -write output.jpg +quality -resize 50% output.png

[snibgo]

It's documented, so it should work, so it's a bug.

[fthiel]

I'm using ImageMagick 7.0.8-14-Q16 and the +quality command is contained in the command list:

I don't know anything about a "+quality" option, but it does show in the list from this command...

Code: Select all

convert -list command

and I found it here https://github.com/ImageMagick/ImageMag ... ion.c#L923. This way I already found out that there is for example a +format and +verbose option which are also not documented on this page https://www.imagemagick.org/script/comm ... ptions.php like +quality.

I noticed something, the following commands are working as expected:

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convert rose: -quality 100 -write output.jpg +quality output2.jpg

but if I use "magick" instead of "convert" I can easily reproduce the InvalidArgument error:

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magick rose: -quality 100 -write output.jpg +quality output2.jpg
magick: InvalidArgument '+quality' '(null)' at CLI arg 6 @ error/operation.c/CLISettingOptionInfo/1243.

I also tried out magick-script and got the same error:

Code: Select all

C:\temp\test>magick -script -
rose:
-quality 100
-write output.jpg
+quality
magick: InvalidArgument '+quality' '(null)' in "stdin" at line 4,column 1 @ error/operation.c/CLISettingOptionInfo/1243.

So this looks like a bug to me.

[magick]

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.

[fthiel]

Thank you for looking into this.