gimpconvert
gboolean gimp_image_convert_rgb (gint32 image_ID);
gint32 image_ID
gboolean gimp_image_convert_grayscale (gint32 image_ID);
gboolean gimp_image_convert_indexed (gint32 image_ID, GimpConvertDitherType dither_type, GimpConvertPaletteType palette_type, gint num_cols, gboolean alpha_dither, gboolean remove_unused, const gchar *palette);
GimpConvertDitherType dither_type
GimpConvertPaletteType palette_type
gint num_cols
gboolean alpha_dither
gboolean remove_unused
const gchar *palette
gboolean gimp_image_convert_set_dither_matrix (gint width, gint height, gint matrix_length, const guint8 *matrix);
gint width
gint height
gint matrix_length
const guint8 *matrix
Since: GIMP 2.4