Following up my own reply with better links to colorspace information. Colorspace faq in more readable formats (html, pdf). http://www.inforamp.net/~poynton/ColorFAQ.html Links to more information on color technology. http://www.inforamp.net/~poynton/Poynton-color.html -----Original Message----- From: John Stebbins [mailto:stebbins@xxxxxxxxxxxxx] Sent: Friday, March 22, 2002 7:26 AM To: 'video4linux-list@xxxxxxxxxx' Subject: Colorspace FAQ (was Re: editing?) You mentioned below that you are prodding Vektor to write something up on color spaces. Have you looked at the colorsapce FAQ? If not, here's a link. http://www.faqs.org/faqs/graphics/colorspace-faq/ -----Original Message----- From: Erik Walthinsen [mailto:omega@xxxxxxxxxxxxxxxxxx] Sent: Friday, March 22, 2002 12:48 AM To: video4linux-list@xxxxxxxxxx Subject: Re: Re: editing? On Fri, 2002-03-22 at 00:27, Gerd Knorr wrote: > > Application writers need to either get over the fact that they should > > be building a lib since none of the kernel folks have. libcolorspace is > > a step in that direction. > URL? libcolorspace is a project that's part of the http://codecs.org/ stuff, most of which is software I've been writing over the last year or so. libcolorspace is a recent addition, with the current code in CVS having been written as a prototype by Wim Taymans, who's also a GStreamer hacker. vektor and wtay and I were hashing out stuff in IRC today, trying to figure out what we really mean by libcolorspace. My initial plan was for it to be a repository for high-speed color conversion routines, such as yuv2rgb for MPEG decoding, etc. I've written a very fast MMX conversion routine I'd love to a) compare against others, and b) see people use. So have others. Where things get nasty is when you realize how much there is to color on its own, not even taking into account the various aspects of sampling and packing. vektor is our resident expert on the color issues, and I've been prodding him to write a page or 3 on what all the color issues are as they're relevant to computer video and graphics, written for someone who has a decent idea of the basics, and CS in general. I've talked with the gcms author, who sounds like he's interested in getting the whole ICC profile stuff integrated as well. The trick in all this is to keep in mind that the end goal of the library is to convert images from one colorspace/format to another. Quickly. To that end there will have to be a large collection of predefined colorspaces, and fast mechanisms to select the appropriate hand-coded conversion routine if it exists, or pick the best of the more general routines. There's a devel mailing list on codecs.org that people can subscribe to (http://lists.sourceforge.net/lists/listinfo/codecs-devel) if they want to discuss libcolorspace or any of the other projects on codecs.org. It's silent now, maybe we can fix that <g> Erik Walthinsen <omega@xxxxxxxxxxxxxxxxxx> - System Administrator __ / \ GStreamer - The only way to stream! | | M E G A ***** http://gstreamer.net/ ***** _\ /_ _______________________________________________ Video4linux-list mailing list Video4linux-list@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/video4linux-list _______________________________________________ Video4linux-list mailing list Video4linux-list@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/video4linux-list
