IM_HISTPLOT(3)

NAME
im_histplot - graph an image of one horizontal or vertical line

SYNOPSIS
#include <vips/vips.h> int im_histplot(in, out)
IMAGE *in, *out;

DESCRIPTION
im_histplot(3) plots a graph of a horizontal or vertical image file with one line. It is suitable for displaying the output of histogram functions such as im_histgr(3) and for displaying line profiles. The input image should be either one horizontal line (Ysize=1) or one vertical line (Xsize=1). If the image is FMTUCHAR, the graph is drawn as 256 by line-length pixels. For all other unsigned integer types, im_histplot(3) finds the image maximum, and draws the graph as max by line-lenth pixels. For signed integer types, im_histplot(3) finds minimum and maximum, moves min up to zero, and draws the graph as min + max by line-lenth pixels. For float types, im_histplot(3) finds minimum and maximum, and scales the image range so as to make the graph square.

RETURNED VALUE
The function returns 0 on success and -1 on error.

SEE ALSO
im_histgr(3), im_extract(3).

COPYRIGHT
National Gallery and Birkbeck College, 1995