Hi, I currently try to simulate old color-film-processes. Esp. Technicolor Systems 1,2,3 and 4. I always liked the chromatic appearance of these and wondered, if it would be possible to change DV material to fake these old film stocks...
For system 1 (and 2...) it's easy. The transformation matrix is: R = R G = (G+B)/2 B = G This gives only red and cyan tones. For system 4 its easy, too, as this is a trichromatic system, just with a (very) high saturation (somewhat calculated differently than the saturation in RGB usually is calculated...): R = 1.5 * R - 0.5 * B G = 1.5 * G - 0.25 * R - 0.25 * B B = 1.5 * B - 0.5 * R But system 3 (which is/was the most advanced bi-chromatic system), it is not so easy. The best approximation I have found so far is this one: R = R G = 0.70 * G + 0.30 * B B = 0.75 * B + 0.75 * G - 0.50 * R I have not included chromatic shifts towards red-yellow (system 4) and magenta (system 3) for the matrices... What would you make to come more close to these? Esp. system 3 (often erroneously referred to as "two-stripe-Technicolor" - there never have been more than one stripe except for system 4...)? cu Stefan PS: would there be demand for an "old-film-look-filter" in the Tools? ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
