formats <- gdkPixbufGetFormats()
writeable_formats <- formats[sapply(formats, gdkPixbufFormatIsWritable)]
If error is set, FALSE will be returned. Possible errors include
those in the GDK_PIXBUF_ERROR domain and those in the G_FILE_ERROR domain.
The variable argument list should be NULL-terminated; if not empty,
it should contain pairs of strings that modify the save
parameters. For example:
# (R does not require vararg lists)
pixbuf$save(handle, "jpeg", "quality", "100")
Currently only few parameters exist. JPEG images can be saved with a
"quality" parameter; its value should be in the range [0,100].
Text chunks can be attached to PNG images by specifying parameters of
the form "tEXt::key", where key is an ASCII string of length 1-79.
The values are UTF-8 encoded strings. The PNG compression level can
be specified using the "compression" parameter; it's value is in an
integer in the range of [0,9].
ICC color profiles can also be embedded into PNG and TIFF images.
The "icc-profile" value should be the complete ICC profile encoded
into base64.
gchar *contents;
gchar *contents_encode;
gsize length;
g_file_get_contents ("/home/hughsie/.color/icc/L225W.icm", &contents, &length, NULL);
contents_encode = g_base64_encode ((const guchar *) contents, length);
gdk_pixbuf_save (pixbuf, handle, "png", &error,
"icc-profile", contents_encode,
NULL);
TIFF images recognize a "compression" option which acceps an integer value.
Among the codecs are 1 None, 2 Huffman, 5 LZW, 7 JPEG and 8 Deflate, see
the libtiff documentation and tiff.h for all supported codec values.
ICO images can be saved in depth 16, 24, or 32, by using the "depth"
parameter. When the ICO saver is given "x_hot" and "y_hot" parameters,
it produces a CUR instead of an ICO.