Re: gdk_pixbuf_composite leaves artifacts in the dest pixbuf, if, dest_x is > 0. Help please?

[Todor Todorov <ttodorov gmx net>]

That did not work either, so I uploaded the 2 images on the Net and here 
are  the links for the interested:

[no artifacts]  http://www.inselpix.com/img/833790624900.jpg

[artifacts] http://www.inselpix.com/img/478403985121.jpg

I hope someone can tell me, what I missed/did wrong when composing the 
target image.

Kind regards,

Todor

On 11/10/2009 06:49 PM, Todor Todorov wrote:
> OK, something happened to the attached images, so let's see about 
> inlining them ...
>
> offset is zero, no artifacts offset is zero, no artifacts
>
> offset is 16, artifacts at the right side of the imageoffset is 16, 
> artifacts at the right side of the image
>
> On 11/10/2009 06:39 PM, Todor Todorov wrote:
> > Hello list,
> >
> > I am trying to create a thumbnail from a digital image, which should 
> > not exceed 128 px width or height. After loading the image, I apply 
> > the EXIF orientation information, if available. In order to prettify 
> > the resulting display, I would like to place the pixbuf horizontally 
> > centered onto another transparent pixbuf with dimensions 128x128 px. 
> > Here is (part of) the code I use (removed the error checking for 
> > simplification):
> >
> > gchar *imgSrcName;
> > GdkPixbuf *src, *interm, *result;
> > guint width, height, xOffset;
> > int i = 0;
> > ...
> > src = gdk_pixbuf_load_from_file_at_scale( imgSrcName, 128, 128, TRUE, 
> > NULL );
> > result = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 
> > gdk_pixbuf_get_bits_per_sample( src ), 128, 128 );
> >
> > interm = gdk_pixbuf_apply_embedded_orientation( src );
> > gdk_pixbuf_unref( src );
> > width = gdk_pixbuf_get_width( interm );
> > height = gdk_pixbuf_get_height( interm );
> > while ( i < 2 )
> > {
> >         gchar *save;
> >
> >         gdk_pixbuf_fill( result, 0xffffff00 );
> >         xOffset = i++ * ( 128 - width ) / 2;
> >         gdk_pixbuf_composite( interm, result, xOffset, 0, width, 
> > height, 0, 0, 1.0, 1.0, GDK_INTERP_NEAREST, 255 );
> >
> >         save = g_strdup_printf( "test%d.jpg", i );
> >         gdk_pixbuf_save( result, save, "jpeg", NULL, "quality", 
> > "100", NULL );
> >         g_free( save );
> > }
> > gdk_pixbuf_unref( interm );
> > gdk_pixbuf_unref( result );
> >
> > As you can see in the attached images, the result is OK only if the 
> > xOffset on translation is 0. The centered version shows artifacts on 
> > the right border of the image. And it does not make a speck of 
> > difference, if the interpolation type is _BILINEAR or _HYPER ...
> >
> > Could anyone please help in solving this ?
> >
> > Regards
> >
> > Todor
> >
> >
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
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