Hi Corinna,
The alpha transparency data is ok as
far as I can see, but the RGB data is
mangled ... presumably I've misunderstood
how the copy_and_convert_pixels() works.
The default converter for converting a rgba value into anything will
multiply the alpha value to all other channels. That's why the rgb
data looks incorrect.
I suggest you have your own color converter. Here is some code:
#include
using namespace boost;
using namespace gil;
class convert_rgba_to_rgb
{
public:
void operator() ( const rgba8_pixel_t& src
, rgb8_pixel_t& dst
) const
{
get_color(dst,red_t()) = get_color(src,red_t());
get_color(dst,green_t()) = get_color(src,green_t());
get_color(dst,blue_t()) = get_color(src,blue_t());
}
};
int main()
{
rgba8_image_t img( 640, 480 );
fill_pixels( view( img ), rgba8_pixel_t( 255, 128, 10, 99 ));
rgba8_planar_image_t dst_planar_image(img.dimensions());
rgb8_image_t dst_rgb_image(img.dimensions() );
copy_and_convert_pixels( view( img ), view( dst_rgb_image ),
convert_rgba_to_rgb() );
rgba8_pixel_t v = *view( img ).xy_at( 0, 0 );
rgb8_pixel_t p = *view( dst_rgb_image ).xy_at( 0, 0 );
return 0;
}
I'm new to the boost::gil library, and am
finding the documentation a little
hard to get to grips with, so any hints
you could give would be greatly appreciated.
Let me know if you have some more issues.
Regards,
Christian
