site_archiver@lists.apple.com Delivered-To: pro-apps-dev@lists.apple.com Hi Gabe (and Trevor) Hi Trevor, Gabe Noise Industries, LLC On Feb 12, 2007, at 2:04 PM, Trevor Anderson wrote: I'm relatively new to FxPlug programming, but I did notice something strange. It seems that in Final Cut, it reduces the red and blue channels in my image giving it a green color cast. Once I noticed this I stripped the plugin down and found that even when I simply send out exactly the pixel values it sent in to me, it still does it. It does it whether I ask for RGB or YUV. If I switch codecs in Final Cut to something like Video, then it doesn't do it, but if I'm in any of the DV codecs, it does. Is this a QuickTime bug? Something to do with color space conversion on rendering? Any help or suggestions would be appreciated, Trevor _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/gds%40noiseindustries.co... _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/emilet%40borisfx.com -- Emile Tobenfeld, Ph. D. Video Producer Image Processing Specialist Video for your HEAD! Boris FX http://www.foryourhead.com http://www.borisfx.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.ap... Is this color shift only seen on NTSC out? I'm not seeing it on my computer screen. At 3:49 PM -0500 2/12/07, Gabriele de Simone wrote: I can confirm your findings, and offer a workaround. That color shift is only there during 8 bit RGB or YUV processing. If that's all your plug-in supports, then you're out of luck. But if you can write your plug-in to support floating point rendering, the unwanted color shift will not be there when you are *rendering*, as long as the "Render all YUV material in high-precision YUV" setting is ON in your sequence setting. Even if your plug-in supports 32 bit float rendering only in RGB, you will still benefit from that the "high-precision" option, since FCP appears to do the float YUV to RGB conversion for you. Obviously, if you plug-in supports 32 bit YUV rendering ('r4fl') you're in the best position for limiting the damage. As a side note: the sequence setting only affects rendering, so there's no way to get rid of that color shift during preview. You'll have to document this fact with your users... This email sent to gds@noiseindustries.com This email sent to emilet@borisfx.com "Now, here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run at least twice as fast as that!" -- The Red Queen This email sent to site_archiver@lists.apple.com