Re: questions on pixel formats
Re: questions on pixel formats
- Subject: Re: questions on pixel formats
- From: Steve Christensen <email@hidden>
- Date: Mon, 4 Feb 2008 15:12:21 -0800
On Feb 4, 2008, at 8:21 AM, Darrin Cardani wrote:
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".
Thanks. I've already started testing in Motion, and the FCP info will
come in handy since I wouldn't necessarily associated that with
floating-point pixels.
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.
1. So the input bitmaps are advertised with the correct channel order?
2. Is this separate from what the formatsFloatRGBABitmapsAsARGB
selector in FxHostCapabilities returns?
3. Or in the Motion case are all bitmaps ARGB, independent of the
pixel depth?
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