Color Image - Adjust Image Brightness

Navigation: Analyses Commands > Color Image > Adjust Image Brightness

Adjust Image Brightness

Page Contents

Description

This feature adjusts the brightness of the color image bitmap, which can be useful for bringing out features in pixels with less signal or for raising the ceiling in saturated images. The default brightness value is 1. A lower brightness value (relative to 1) will dim the image while a larger value will brighten the image. When calculating the color image, the tristimulus values of each pixel are scaled by the ratio of (brightness/Y_max) prior to converting from XYZ tristimulus to RGB, where Y_max is the maximum Y tristimulus value in the image.

Navigation

This command can be accessed in the following ways:

•Perform a color image analysis ( Menu > Analysis > Color Image ) and select the appropriate analysis surface.

•Right click in the resulting color image analysis window and select Adjust Image Brightness from the drop-down menu.

Controls

Control	Inputs / Description	Defaults
Brightness	Scaling factor for relative image brightness. Values larger than one correspond to making the image brighter. Values less than one correspond to making the image dimmer.	1
Report number of out-of-gamut colors	Check to report number of out-of-gamut colors, which refer to those colors that cannot be represented by the current color space.	Unchecked
Update	Update the image brightness and leave the dialog box open.
OK	Update the image brightness and close the dialog box.
Cancel	Discard all image brightness changes and close the dialog box.
Help	Access this Help page.