Re: Color shifting with r408
Re: Color shifting with r408
- Subject: Re: Color shifting with r408
- From: Darrin Cardani <email@hidden>
- Date: Wed, 23 Dec 2009 14:54:48 -0800
On Dec 23, 2009, at 2:32 PM, Robert Monaghan wrote:
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?
Darrin
--
Darrin Cardani
email@hidden
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