Method

GimpDrawablehistogram

since: 2.10

Declaration [src]

gboolean
gimp_drawable_histogram (
  GimpDrawable* drawable,
  GimpHistogramChannel channel,
  gdouble start_range,
  gdouble end_range,
  gdouble* mean,
  gdouble* std_dev,
  gdouble* median,
  gdouble* pixels,
  gdouble* count,
  gdouble* percentile
)

Description [src]

Returns information on the intensity histogram for the specified drawable.

This tool makes it possible to gather information about the intensity histogram of a drawable. A channel to examine is first specified. This can be either value, red, green, or blue, depending on whether the drawable is of type color or grayscale. Second, a range of intensities are specified. The gimp_drawable_histogram() function returns statistics based on the pixels in the drawable that fall under this range of values. Mean, standard deviation, median, number of pixels, and percentile are all returned. Additionally, the total count of pixels in the image is returned. Counts of pixels are weighted by any associated alpha values and by the current selection mask. That is, pixels that lie outside an active selection mask will not be counted. Similarly, pixels with transparent alpha values will not be counted. The returned mean, std_dev and median are in the range (0..255) for 8-bit images or if the plug-in is not precision-aware, and in the range (0.0..1.0) otherwise.

Available since: 2.10

Parameters

channel

Type: GimpHistogramChannel

The channel to query.

start_range

Type: gdouble

Start of the intensity measurement range.

end_range

Type: gdouble

End of the intensity measurement range.

mean

Type: gdouble*

Mean intensity value.