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bug#28692: Emacs fails to display images


From: Diego Nicola Barbato
Subject: bug#28692: Emacs fails to display images
Date: Thu, 05 Oct 2017 18:11:39 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Hello Ludo,

address@hidden (Ludovic Courtès) writes:

> Hello Diego,
>
> Diego Nicola Barbato <address@hidden> skribis:
>
>> Several of emacs image related features have stopped working properly:
>> * Eww does not render images showing empty squares instead.
>> * When visiting an image in a buffer and pressing n to visit the next
>>   image the next image is either not displayed at all (showing an empty
>>   square instead) or a thumbnail sized version is displayed.
>> * Transformations such as "Fit to Window Width" or "Rotate Image" do not
>>   work at all. The following error message is displayed instead:
>>   ImageMagick error: no decode delegate for this image format `PBM' @
>>   error/constitute.c/ReadImage/504
>>   (This happens with all image formats not just .pbm)
>
> Indeed, I experience this with DocView as well (when resizing), which
> leads to:
>
>   ImageMagick error: no decode delegate for this image format `PNG' @ 
> error/constitute.c/ReadImage/504
>
> Could it be a CLI change in ImageMagick?  The package was upgraded in
> 87a9c53b7ca08bd490c94fe5579c3f26c19be78c.
>
> Ludo’.

I believe the bug was introduced in
030030f4416b54285dcdd58bddb863c0e6bda4c4. It appears to be a known bug
in ImageMagick (https://github.com/ImageMagick/ImageMagick/issues/825),
which was already present in version 6.9.9-15.
It has been fixed in version 6.9.9-18
(https://github.com/ImageMagick/ImageMagick/blob/ImageMagick-6/ChangeLog).

Diego






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