[PD] blue and yellow alpha

IOhannes m zmoelnig zmoelnig at iem.at
Mon Oct 1 17:39:24 CEST 2007

henrik wurster wrote:
> hihi this happened to me with GEM and quicktime movies...still didnt 
> figure out how to use alpha blending yet !

oh, for alpha blending you obviously need the data in a format that 
understands alpha!
[pix_film] on os-x outputs YUV by default, where there is now 
alpha-channel, so you cannot apply an alpha-mask.
make sure that you get your data in RGBA colorspace, either by sending 
the [pix_film] a [colorspace RGBA( message or explicitely by using 


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