[PD] [GEM] Flatten Alpha for storage, then restore it

Spencer Russell spencer.f.russell at gmail.com
Sat Aug 2 06:55:08 CEST 2008

the help file of pix_write says that it takes a picture of the frame
buffer, whereas I want to capture the current pix frame. I need to
capture from a camera without displaying it to the screen. I'm looking
into it, though, because I seem to be having lots of segfaults with
pix_record, especially trying with more than one of them.


On Fri, Aug 1, 2008 at 8:58 PM, Jack <jack at rybn.org> wrote:
> You can use [pix_write].
> ++
> Jack
> Le 2 août 08 à 02:25, Spencer Russell a écrit :
>> I'm mixing video by background subtracting it and then setting the
>> background transparent (alpha = 0), then texturing each video onto
>> overlapping rectangles to achieve a compositing effect.
>> I need to record the different videos with [pix_record] and then play
>> them back later while preserving the alpha somehow, so I was thinking
>> that I could just replace all the transparent part with bright pink or
>> something and store it as regular photo jpeg frames, and then later
>> set all the bright pink parts to transparent when I read the video
>> back.
>> I'm having trouble with both sides of the conversion, though. Perhaps
>> there's a better approach entirely?
>> thanks,
>> spencer
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