Use the Image > Pseudo Color... command to change the active image's color table, or to define a new color table. You can use pseudo color tables to have gray-value images displayed in color. Then every intensity value in an image will be allotted a hue.
Prerequisite: This command is only available when the active document is a gray-value image.
Note: You don't change any image data when you use this function. The image will only be displayed differently on your monitor. The color table will be saved along with the image, if you save the image in the TIF or VSI format.
Image types and color tables
You cannot define a color table for true-color images. For this reason, the Image > Pseudo Color... command is not available for this type of image.
To display a 16-bit gray-value image on your monitor, you always need a special color table that maps the 16 bit gray values of the image to 256 gray values. The reason for this is that your monitor can display far fewer gray values, only (256), than a 16-bit image contains, (65535).
In addition to this color table which is always active, you can also have a 16-bit gray-value image displayed in color. A color table always refers to the gray-value image that is currently being displayed on your monitor, and which contains only 256 gray values.
Time stacks can be made up of gray-value images. You can also display these multi-dimensional images with a color table. This is especially valid for multi-channel images. All of the frames will then be displayed with the same color table.
See also
Changing the way an image is displayed
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