https://bugs.kde.org/show_bug.cgi?id=376950
--- Comment #11 from Boudewijn Rempt <b...@valdyas.org> ---
Okay, gimp also assumes that EXTRASAMPLE_UNSPECIFIED is alpha:
/* test if the extrasample represents an associated alpha channel... */
if (extra > 0 && (extra_types[0] == EXTRASAMPLE_ASSOCALPHA))
{
alpha = TRUE;
tsvals.save_transp_pixels = FALSE;
extra--;
}
else if (extra > 0 && (extra_types[0] == EXTRASAMPLE_UNASSALPHA))
{
alpha = TRUE;
tsvals.save_transp_pixels = TRUE;
extra--;
}
else if (extra > 0 && (extra_types[0] == EXTRASAMPLE_UNSPECIFIED))
{
/* assuming unassociated alpha if unspecified */
g_message ("alpha channel type not defined for file %s. "
"Assuming alpha is not premultiplied",
gimp_file_get_utf8_name (file));
alpha = TRUE;
tsvals.save_transp_pixels = TRUE;
extra--;
}
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