Re: Using GdkPixbuf buffers with GraphicsMagick

[Luka Napotnik <luka napotnik gmail com>]

Hello.

Well I need a dither filter for my image buffer. That's why I'm looking
at GraphicsMagick.

Greets,
Luka

Dne 06.01.2009 (tor) ob 13:48 +0200 je Dov Grobgeld zapisal(a):
> The data of a GdkPixbuf is layed out as a continous allocated chunk of
> memory in one of the following format RGBRGBRGB for 24-bit images, or
> RGBARGBARGBA, for 32-bit images, where R,G,B,A stands for the red,
> green, blue, and alpha components respectively. Lines may be also
> padded to row_stride bytes. Since you don't describe what
> GraphicsMagic() expects and how you extracts the relevent info from
> the pixbuf, it is impossible to say what went wrong.
>
> In any case you can use any library, e.g. cairo, agg, OpenCV, or
> access the pixels straight in the GdkPixbuf.
>
> Regards,
> Dov
>
> 2009/1/6 Luka Napotnik <luka napotnik gmail com>
>         Hello.
>         
>         I'm trying to use GraphicsMagic (the successor of ImageMagick)
>         to
>         manipulate a GdkPixbuf image buffer. The problem is that the
>         program
>         segfaults, probably due to the raw nature of the buffer which
>         the Magick
>         API doesn't handle very good.
>         I'm opening the image buffer with MagickReadImageBlob() and
>         then apply
>         some filters.
>         
>         Does anyone have experiences using GdkPixbuf together with
>         GraphicsMagick or can anyone suggest alternatives to
>         GraphicsMagick
>         which works well with GdkPixbuf?
>         
>         Greets,
>         Luka
>         
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-- 
lp,
Luka