[Qt-interest] QImageWriter says JPEG supported, but won't write JPEG Files

[Rainer Wiesenfarth]

From: Josiah Bryan
> I can't seem to get QImageWriter to write out JPEG files, even though 
> the supportedImageFormats() list gives jpeg/jpg as a 
> supported format! 
> (Qt "4.7.0" and 4.5.2 both exhibit this problem)
> 
> I don't get any errors from the QImageWriter API, but the 
> message on the 
> console is:
> 
> QJpegHandler: unable to write image of format 7
> [...]

I took a look at QImage's documentation and it tells me that "format 7" is
QImage::Format_RGB16 (16bit/pixel, 5-6-5). Probably you have to convert your
image to a "more standard" format like QImage::Format_RGB32, using
QImage::convertToFormat().

Best Regards / Mit freundlichen Grüßen
Rainer Wiesenfarth

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