[cairo] Pixels data mismatch while loading image with OpenCv and CairoGraphics

[Deepak Kumar JAIN]

Thanks Maarten for the advice. OpenCV loads the image in RGB format but
Cairo Loads in PRGB(Pre multiplied with Alpha channele). hence while loading
the image, I convert the 3 channel image to 4 channel in OpenCV and then
pass the resulting image to Cairo and then I get the perfect result.

Thanks all for the advice. But still I can't find how can I check for the
format of the image as I create the surface from data and its need to have
format as parameter.

Thanks for the advices.

Deepak

On Wed, Sep 14, 2011 at 6:18 PM, Maarten Bosmans <mkbosmans at gmail.com>wrote:

> 2011/9/14 Deepak Kumar JAIN <deepak19dec at gmail.com>:
> > Hello All,
> >
> > When I load the same png image in OpenCV and cairoGraphics, I see that
> the
> > data of the image is not same.
> >
> >
> > http://postimage.org/image/vlpntz38/
> >
> > Image can be seen here. I see that every 4th data entry in after I get
> data
> > from surface has value of 255. I dont know why.
> >
> > Can anyone give the explanation of this?
>
> OpenCV is probably expecting RGB, while cairo is providing ARGB data.
>
> Try constructing a 24bpp ImageSurface.
>
> Maarten
>
> > Thanks,
> > Deepak
> >
> >
> >
> > --
> >
> > Thanks & Regards,
> > Deepak Kumar JAIN
> > Internship student,
> > Orange Labs,France Telecom,
> > Rennes, France
> > Contact: +33(0)6 31 15 44 66
> > www.deepakkumarjain.co.cc
> >
> > "I err therefore I am "- Saint Augustine
> >
> >
> > --
> > cairo mailing list
> > cairo at cairographics.org
> > http://lists.cairographics.org/mailman/listinfo/cairo
> >
>



-- 

Thanks & Regards,
Deepak Kumar JAIN
Internship student,
Orange Labs,France Telecom,
Rennes, France
Contact: +33(0)6 31 15 44 66
www.deepakkumarjain.co.cc

"*I err therefore I am *"- Saint Augustine
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