User Guide

Chapter Finish
11 - 195
Color Correction Editor
Histogram
The Histogram shows the distribution and frequency of the RGB values contained in an image. It
has no spatial relationship to the associated image.
Color correction using the Histogram (HistoMatch) is described elsewhere:
page 11-212.
Histogram Display
w A field is displayed for each channel (red, green, blue).
w The values are plotted from left to right on the X axis (0 to 255), the scale is divided by 10
scale marks along the upper horizontal lines.
w The two inner dotted red lines indicate the edges of the permissible range (approximately
as per CCIR 601) and the outer dotted lines represent 0 and 255. See “Legalizer” on page
11-198.
w The Y axis (from bottom to top) represents the number of pixels for each point along the
X axis. The Y axis is scaled so that the full height of the scale always represents the maxi-
mum value detected, the others adapt accordingly.
w The histogram for a reference source is dark blue; wherever values overlap, the green his-
togram of the current image is somewhat brighter.