Color shifting with r408
Color shifting with r408
- Subject: Color shifting with r408
- From: Robert Monaghan <email@hidden>
- Date: Wed, 23 Dec 2009 14:32:01 -0800
Hi everyone,
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).
Thanks,
bob.
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