gimp_brightness_contrast ()

gboolean
gimp_brightness_contrast (gint32 drawable_ID,
                          gint brightness,
                          gint contrast);

gimp_levels ()

gboolean
gimp_levels (gint32 drawable_ID,
             GimpHistogramChannel channel,
             gint low_input,
             gint high_input,
             gdouble gamma,
             gint low_output,
             gint high_output);

gimp_levels_auto ()

gboolean
gimp_levels_auto (gint32 drawable_ID);

gimp_levels_stretch ()

gboolean
gimp_levels_stretch (gint32 drawable_ID);

gimp_posterize ()

gboolean
gimp_posterize (gint32 drawable_ID,
                gint levels);

gimp_desaturate ()

gboolean
gimp_desaturate (gint32 drawable_ID);

gimp_desaturate_full ()

gboolean
gimp_desaturate_full (gint32 drawable_ID,
                      GimpDesaturateMode desaturate_mode);

Since: GIMP 2.4

gimp_equalize ()

gboolean
gimp_equalize (gint32 drawable_ID,
               gboolean mask_only);

gimp_invert ()

gboolean
gimp_invert (gint32 drawable_ID);

gimp_curves_spline ()

gboolean
gimp_curves_spline (gint32 drawable_ID,
                    GimpHistogramChannel channel,
                    gint num_points,
                    const guint8 *control_pts);

gimp_curves_explicit ()

gboolean
gimp_curves_explicit (gint32 drawable_ID,
                      GimpHistogramChannel channel,
                      gint num_bytes,
                      const guint8 *curve);

gimp_color_balance ()

gboolean
gimp_color_balance (gint32 drawable_ID,
                    GimpTransferMode transfer_mode,
                    gboolean preserve_lum,
                    gdouble cyan_red,
                    gdouble magenta_green,
                    gdouble yellow_blue);

gimp_colorize ()

gboolean
gimp_colorize (gint32 drawable_ID,
               gdouble hue,
               gdouble saturation,
               gdouble lightness);

Since: GIMP 2.2

gimp_histogram ()

gboolean
gimp_histogram (gint32 drawable_ID,
                GimpHistogramChannel channel,
                gint start_range,
                gint end_range,
                gdouble *mean,
                gdouble *std_dev,
                gdouble *median,
                gdouble *pixels,
                gdouble *count,
                gdouble *percentile);

gimp_hue_saturation ()

gboolean
gimp_hue_saturation (gint32 drawable_ID,
                     GimpHueRange hue_range,
                     gdouble hue_offset,
                     gdouble lightness,
                     gdouble saturation);

gimp_threshold ()

gboolean
gimp_threshold (gint32 drawable_ID,
                gint low_threshold,
                gint high_threshold);