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gboolean gimp_brightness_contrast (gint32 drawable_ID,gint brightness,gint contrast);
gboolean gimp_levels (gint32 drawable_ID,GimpHistogramChannel channel,gint low_input,gint high_input,gdouble gamma,gint low_output,gint high_output);
gboolean
gimp_levels_auto (gint32 drawable_ID);
gimp_levels_auto is deprecated and should not be used in newly-written code.
Use gimp_levels_stretch() instead.
gboolean
gimp_levels_stretch (gint32 drawable_ID);
gimp_levels_stretch is deprecated and should not be used in newly-written code.
gboolean gimp_desaturate_full (gint32 drawable_ID,GimpDesaturateMode desaturate_mode);
Since: GIMP 2.4
gboolean gimp_curves_spline (gint32 drawable_ID,GimpHistogramChannel channel,gint num_points,const guint8 *control_pts);
gboolean gimp_curves_explicit (gint32 drawable_ID,GimpHistogramChannel channel,gint num_bytes,const guint8 *curve);
gboolean gimp_color_balance (gint32 drawable_ID,GimpTransferMode transfer_mode,gboolean preserve_lum,gdouble cyan_red,gdouble magenta_green,gdouble yellow_blue);
gboolean gimp_colorize (gint32 drawable_ID,gdouble hue,gdouble saturation,gdouble lightness);
Since: GIMP 2.2
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);
gboolean gimp_hue_saturation (gint32 drawable_ID,GimpHueRange hue_range,gdouble hue_offset,gdouble lightness,gdouble saturation);