site_archiver@lists.apple.com Delivered-To: pro-apps-dev@lists.apple.com On Dec 23, 2009, at 2:32 PM, Robert Monaghan wrote: Darrin -- Darrin Cardani dcardani@apple.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... I am working on a FxPlug Filter. I have created a simple filter that uses both r408 and r4fl. Currently, the filter takes incoming r408 (or r4fl) bytes, converts them to RGB, does some work, and then back to r408. I am having a really difficult time trying to get the r408 image to match the r4fl image. The r4fl is always darker than the r408. I am on Snow Leopard, testing with Final Cut Pro 7.0.1. I am using a scale value of 255/219 on the incoming Y channel, and a value of 219/255 to scale back out. The formula looks something li The odd part about this, is that the code that I normally use in my QuickTime component to convert from r408/r4fl to RGB (and back) doesn't work with this API. I get color shifting with r408 and luminance problems with r4fl. Can anyone suggest some ways of tweaking the YCbCr <-> RGB code to get a match? (Or better yet, post a recommended C code sample for both r408 and r4fl). Can you be more specific? What matrices are you using for the conversion? Are you checking to see whether you're getting Rec 601 or Rec 709? Are both cases broken? This email sent to site_archiver@lists.apple.com