Hi Laurent, On Mon, Dec 18, 2017 at 12:50 PM, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > On Monday, 18 December 2017 13:46:22 EET Tomi Valkeinen wrote: >> On 18/12/17 13:36, Laurent Pinchart wrote: >> > The problem with PNG (or any other format really) is that you not only >> > need to encode the image into the target format (PNG or JPG would require >> > external libraries, simpler formats such as BMP or PNM could be handled >> > internally), but you also need to convert the image to a particular RGB >> > or YUV format depending on what the output format requires. >> >> Yes, that's the "hassle" part I was referring to =). >> >> Maybe we need to invent a new file format that can store all kinds of >> formats? (https://xkcd.com/927/) >> >> > If you want to do so, I would like to reuse code from the v4l2convert >> > library. The code should be moved to a library that doesn't depend on >> > V4L2, as the current API encapsulate conversion in other operations. >> > Other tools such as raw2rgbpnm could then be ported to use that library; >> >> Yep, so I agree that doing color format conversions shouldn't really be >> kms++'s job, but at the same time I'd like to be able to export >> framebuffers. >> >> And I'm fine with adding dependencies to kms++, as long as all those are >> optional. >> >> Aren't there "big" image conversion libraries that would do the job? >> Imagemagick? Or something? I have used "convert" command to do some >> conversions, that comes from ImageMagick. > > That's an option too. I had a look at the code once to find out how > ImageMagick was performing scaling and gave up with a headache soon > afterwards. We need more formats than what ImageMagick currently supports > (it's mostly focused on image file formats instead of raw image formats), with > all kind of RGB, YUV (and ideally Bayer) formats, and I don't think extending > ImageMagick would be the way to go. netpbm is your friend. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
