|  |  |  | GIMP Library Reference Manual |  | 
|---|---|---|---|---|
gboolean gimp_image_convert_rgb (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);
gboolean gimp_image_convert_rgb (gint32 image_ID);
Convert specified image to RGB color
This procedure converts the specified image to RGB color. This process requires an image of type GIMP_GRAY or GIMP_INDEXED. No image content is lost in this process aside from the colormap for an indexed image.
| image_ID: | The image. | 
| Returns : | TRUE on success. | 
gboolean gimp_image_convert_grayscale (gint32 image_ID);
Convert specified image to grayscale (256 intensity levels)
This procedure converts the specified image to grayscale with 8 bits per pixel (256 intensity levels). This process requires an image of type GIMP_RGB or GIMP_INDEXED.
| image_ID: | The image. | 
| Returns : | TRUE on success. | 
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);
Convert specified image to and Indexed image
This procedure converts the specified image to 'indexed' color. This process requires an image of type GIMP_GRAY or GIMP_RGB. The 'palette_type' specifies what kind of palette to use, A type of '0' means to use an optimal palette of 'num_cols' generated from the colors in the image. A type of '1' means to re-use the previous palette (not currently implemented). A type of '2' means to use the so-called WWW-optimized palette. Type '3' means to use only black and white colors. A type of '4' means to use a palette from the gimp palettes directories. The 'dither type' specifies what kind of dithering to use. '0' means no dithering, '1' means standard Floyd-Steinberg error diffusion, '2' means Floyd-Steinberg error diffusion with reduced bleeding, '3' means dithering based on pixel location ('Fixed' dithering).
| image_ID: | The image. | 
| dither_type: | The dither type to use. | 
| palette_type: | The type of palette to use. | 
| num_cols: | The number of colors to quantize to, ignored unless (palette_type == GIMP_MAKE_PALETTE). | 
| alpha_dither: | Dither transparency to fake partial opacity. | 
| remove_unused: | Remove unused or duplicate colour entries from final palette, ignored if (palette_type == GIMP_MAKE_PALETTE). | 
| palette: | The name of the custom palette to use, ignored unless (palette_type == GIMP_CUSTOM_PALETTE). | 
| Returns : | TRUE on success. |