gimpconvert

gimpconvert — Conversions between RGB, indexed, and grayscale modes.

Synopsis




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);

Description

Conversions between RGB, indexed, and grayscale modes.

Details

gimp_image_convert_rgb ()

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.

gimp_image_convert_grayscale ()

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.

gimp_image_convert_indexed ()

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.