[PD] [pix_crop] offY incoherence

[Mathieu Bouchard]

On Mon, 7 Jun 2010, patko wrote:

> yes In the project I'm working on I have to manage three different 
> coordinates systems , the picture size in pixels, the blob from 
> [pix_blob] between 0 and 1, and openGL coordinates, between something 
> like 10.66, and something else like 8, depending on view parameters.

well, most likely, that 8 is exactly 8, and the 10.66 is exactly 8*4/3, 
because of your aspect ratio.

Note that if you normalise your coords to the [0;1] interval, you will get 
anamorphic pixels, because your scale factor is not the same in both axes.
This can be more trouble than keeping the original coords.

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| Mathieu Bouchard, Montréal, Québec. téléphone: +1.514.383.3801