Unsupported color conversion request

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Anjanesh

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Apr 17, 2011, 12:06:00 AM4/17/11
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For many JPGs I get :

cwebp -q 75 01.jpg -o 01.webp
Unsupported color conversion request
Error! Could not process file 01.jpg
Error! Cannot read input picture

All are of RGB colour space not CMYK.

Vikas Arora

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Apr 17, 2011, 11:22:39 PM4/17/11
to anja...@gmail.com, webp-d...@webmproject.org
Can you upload the jpeg file.


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Vikas Arora

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Apr 18, 2011, 1:03:41 AM4/18/11
to Anjanesh Lekshminarayanan, webp-d...@webmproject.org
This jpeg image has 4 color CMYK components and currently not supported in the example implementation of webp encoder (cwebp).

You can try converting to RBG color-space via ImageMagick (convert) or any other image-editor tool.
convert -colorspace RGB 05.jpg 05_RGB.jpg
cwebp -q 75 05_RGB.jpg -o 05_RGB.webp

On Mon, Apr 18, 2011 at 9:30 AM, Anjanesh Lekshminarayanan <anja...@gmail.com> wrote:
---------------------------------------------------------
Thanks & Regards
Anjanesh Lekshminarayanan

Anjanesh

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Apr 19, 2011, 2:01:03 AM4/19/11
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Thanks. GIMP shows all of them as under RGB colorspace.

ImageMagick showed it as CMYK.
identify -format "%[colorspace]" 05.jpg
CMYK

elan...@gmail.com

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Sep 17, 2015, 4:04:31 PM9/17/15
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exec("convert -colorspace RGB ".$imageName." ".$webpimgName . " ");

http://www.codingslover.com/2015/07/cwebp-unsupported-color-conversion-request.html

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James Zern

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Nov 7, 2022, 8:05:34 PM11/7/22
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Hi,

On Mon, Nov 7, 2022 at 12:35 AM MND LSN <mnd...@gmail.com> wrote:
I am on `Ubuntu 20.04 (LTS) x64` with `cwebp -version 1.2.4` and while processing about 320,009 files with this    
```
nohup `for file in img/*; do cwebp -quiet -q 50 "$file" -o "${file%.*}.webp"; done`
```
I get this kind of errors 
```
libjpeg error: Unsupported color conversion request

I think this has a similar root cause as https://crbug.com/webp/311#c5. The error comes from libjpeg which is outside of cwebp's control. The input is CMYK and the example is requesting RGB (djpeg -rgb will fail similarly). The tool could add a conversion, but the same issue as the libjpeg-turbo patch exists. It might be worth trying ImageMagick for the conversion.
 
Error! Could not process file img/037946023.jpg
Error! Cannot read input picture file 'img/037946023.jpg'
```
Attached below the example image `037946023.jpg`

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Nicely done

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Dec 31, 2022, 3:49:11 AM12/31/22
to WebP Discussion, James Zern
Hello I have similar issue on ubuntu

libjpeg error: Unsupported color conversion request
Error! Could not process file 345632.jpg
Error! Cannot read input picture file '345632.jpg'

On windows everything is fine though.

вівторок, 8 листопада 2022 р. о 03:05:34 UTC+2 James Zern пише:
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