On Mon, 7 Sep 2009, IOhannes m zmoelnig wrote:
Miha Tomi wrote:
On Linux using Gem 0.92 from SVN I am using [pix_video] with Logitech QuickCam 4000 and v4l driver but the red and blue colours are swapped. Is there a way to instruct [pix_video] to use different colorspace (BGR instead of RGB)? If not what is the cheapest way to convert from one colorspace to the other.
a simple _hack_ is to use YUV-colorspace with [pix_video] and then (if you really need it) [pix_rgba] to convert to RGBA.
Do you mean that the BGR thing is a bug in Gem or what? Because if it isn't, then YUV might as well be YVU, in which case you'd still use [pix_colormatrix], but possibly with different constants... what is [pix_colormatrix] supposed to do on a YUV image ? are its coefficients still RGB-wise in that case?
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