[TYPO3] imgResource returns jpg

[JoH]

> I use imgResource in TypoScript to produce small thumbnails from
> jpegs. Thumbnail has a jpg extension but it is gif file (with ugly
> dither).
>
> ... {
>  file.width = 120c
>  file.height = 120c
>  file.maxH = 120
>  file.maxW = 120
> }

This is a known bug of the cropscale feature (which is triggered by the c 
behind the size value).
It's currently based on a GIFBUILDER setup which is hardcoded as a PHP array 
so you can't get rid of it unless you use a patch from the bugtracker.

HTH

Joey