Hi Marcelo,
The imImageCopyAttributes function does not depend on the alpha flag. So
switching with imImageAddAlpha would not produce the expected result.
imImageCopyAttributes will blindly copy all attributes.
Actually the alpha layer (we cal it plane) information is stored together
with the color planes data, not in the metadata information. And it is not
being copied because imImageCreateBased does not copy any data.
So if you need to copy just the alpha plane then after
calling imImageCreateBased, call the imImageCopyPlane function with
src_plane=dst_plane=alpha_plane. For instance:
if (src_image->has_alpha)
{
int alpha_plane = src_image->depth;
imImageCopyPlane(src_image, alpha_plane, dst_image, alpha_plane);
}
Best Regards,
Antonio Scuri
2014-07-10 15:33 GMT-03:00 Marcelo Ghelman <[email protected]>:
> Hi Scuri,
>
> The *imImageCreateBased* function has a bug.
> If the source image has transparency, the function don't copy the alpha
> layer.
> To fix it, just swap lines, calling *imImageAddAlpha* before
> *imImageCopyAttributes*.
>
> Best regards,
> Ghelman
> --
> *Marcelo Ghelman*
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