| Image Processing Toolbox | |
Displaying RGB Images
RGB images, also called truecolor images, represent color values directly, rather than through a colormap.
To display an RGB image, the most basic syntax is
RGB is m-by-n-by-3 array. For each pixel (r,c) in RGB, imshow displays the color represented by the triplet (r,c,1:3).
Systems that use 24 bits per screen pixel can display truecolor images directly, because they allocate 8 bits (256 levels) each to the red, green, and blue color planes. On systems with fewer colors, MATLAB displays the image using a combination of color approximation and dithering. See Working with Different Screen Bit Depths for more information.
The Image and Axes Properties of an RGB Image
When you display an RGB image, imshow sets the Handle Graphics properties that control how colors display, as follows:
CData property is set to the data in RGB. The data will be three-dimensional. When CData is three-dimensional, MATLAB interprets the array as truecolor data, and ignores the values of the CDataMapping, CLim, and Colormap properties.
CDataMapping property is ignored.
CLim property is ignored.
Colormap property is ignored.
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