![]() The number of distinct colors that can be produced by the screen. We often use the variable name RGB to represent an RGB image in memory. In MATLAB, an RGB image is represented by an m-by-n-by-3 array of class uint8, uint16, or double. This term is synonymous with the term "grayscale".Īn image in which each pixel is specified by three values - one each for the red, blue, and green components of the pixel's color. We often use the variable name I to represent an intensity image in memory. ![]() While intensity images are not stored with colormaps, MATLAB uses a system colormap to display them. In MATLAB, intensity images are represented by an array of class uint8, uint16, or double. Briefly describe an algorithm in MATLAB to read an image, whether color, gray-scale or black and white, and find its negative. We often use the variable name X to represent an indexed image in memory, and map to represent the colormap.Īn image consisting of intensity (grayscale) values. ind2gray then replaces the indices in the image X with the corresponding grayscale intensity values in the gray colormap. Use of a shared library preserves performance optimizations but limits the target platforms for which code can be. ind2gray converts the colormap to NTSC coordinates using rgb2ntsc, and sets the hue and saturation components ( I and Q) to zero, creating a gray colormap. Note that if you choose the generic MATLAB Host Computer target platform, imadjust generates code that uses a precompiled, platform-specific shared library. The colormap is always an m-by-3 array of class double. imadjust supports the generation of C code (requires MATLAB Coder). In MATLAB, an indexed image is represented by an array of class uint8, uint16, or double. The methods of approximation discussed in this chapter are colormap mapping, uniform quantization, and minimum variance quantization.Īn image whose pixel values are direct indices into an RGB colormap. The method by which the software chooses replacement colors in the event that direct matches cannot be found. For more explanation of this table and others like it, see Words You Need to Know in the Preface.
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