Re: questions on pixel formats
Re: questions on pixel formats
- Subject: Re: questions on pixel formats
- From: Darrin Cardani <email@hidden>
- Date: Mon, 4 Feb 2008 08:21:28 -0800
On Feb 3, 2008, at 12:02 PM, Steve Christensen wrote:
I don't remember seeing these specifically addressed so I figured
I'd ask so I can make sure I'm doing everything correctly. I'm
currently interested in the software rendering case, but if there
some differences in the hardware case, that'd be nice to know as well.
1. So far all the images or video I load into a project for testing
use 32-bit ARGB/RGBA for the pixel format. If I've read the docs
correctly, I should also expect to see 128-bit floating point ARGB/
RGBA pixels in some circumstances. If that's so, what can I do to
get that to happen so I can test that I'm handling that case
correctly?
In FCP, I think it's this:
1) select your sequence in the browser, or click on the timeline window
2) From the "Sequence" menu, select "Settings..."
3) Click on the "Video Processing" tab
4) Click on the "Render all YUV material in high-precision YUV"
In Motion:
1) From the "Edit" menu, select "Project Properties"
2) Change the "Bit Depth" popup from "8 Bit" to "32 Bit".
2. Can I assume that the input and output images will always have
the same sized pixels, i.e., I shouldn't expect to see a 32-bit
pixel in the input image(s) and a 128-bit pixel in the output image?
Correct. Input and output should always be the same bit depth and
channel order. Note that there is a bug in Motion in which the output
bitmap will claim to be RGBA, when it's really ARGB, just like the
input (when working in software). It's safe to ignore it and output
ARGB.
Darrin
--
Darrin Cardani
email@hidden
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