bug#38310: 27.0.50; (image-convert "data" t) doesn't work

[Lars Ingebrigtsen]

Katsumi Yamaoka <yamaoka@jpl.org> writes:

> Whereas (image-convert "file") works, (image-convert "data" t)
> causes an error as follows:
>
> (let ((image-converter 'graphicsmagick))
>   (image-convert "data" t))
> =>
> image-convert: /usr/bin/gm convert: Unable to open file (-) [No such
> file or directory].

Yeah, but that's not a valid call format.  As the doc string says

---
If IMAGE-FORMAT is non-nil, IMAGE is a string containing the
image data, and IMAGE-FORMAT is a symbol with a MIME format name
like "image/webp".
---

So you have to say

(image-convert "data" 'image/webp)

I'll rephrase the doc string, because it's not very well-written.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no