If the input is the name of a color, a search is done to find a matching name, and the corresponding RGB triple is returned. If the input is a color index (1-21), it is converted to an RGB triple If the input is an RGB triple with elements in, it is scaled by The calling program without modification. If the input is an RGB triple with elements in, it is returned to RGB is a length-3 vector of RGB components that can be used as a color specifier with any of the Matlab graphics functions. See the code for the list of color names. Note that some colors have more than one name, in which case any of these may be used. index_or_name can be a color index (whole number from 1-21), a string containing the name of a color in lower case, an RGB triple with elements in, or an RGB triple with elements in. For eight of these colors that have more than one common name, the program accepts alternative names, reducing the memory burden on the user. RGB() allows the user to access a set of 21 colors via their common English names. Imwrite(imgRGB, 'myImage.The Matlab function RGB() converts a color index (whole number from 1-21), English name of a color (string), or RGB triple with whole number components in into an RGB triple with real-valued components in. Now you can use the function cat to put the three color components into an N-by-M-by-3 RGB image matrix, then save the image to an RGB24 bitmap file using the function imwrite: imgRGB = cat(3, imgR, imgG, imgB) % Concatenate along the third dimension This will give you three color component matrices the same size as img: imgR = uint8((255/31).*bitshift(bitand(img, 63488), -11)) % Red component The label2rgb function picks colors from the entire range of the colormap. The label2rgb function determines the color to assign to each object based on the number of objects in the label matrix. If the bitdepth is 1 then the image is intentionally binary. RGB label2rgb (L) converts a label image, L into an RGB color image for the purpose of visualizing the labeled regions. Next, you can use the function bitshift and multiplication by a scale factor to scale the red, green, and blue values to a range of 0 to 255, then convert them to an unsigned 8-bit integer using the function uint8. One test that can be made is to use imfinfo and examine the file's bitdepth property. The intensities must be in the range 0, 1. First, you can use the function bitand to extract the bits for the red, green, and blue components, whose positions in the 16-bit integer are illustrated here: What I have done thus far to create RGB images is to just load a white image and seperate the red green and blue components from this image and combine them. An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of a color. Let's assume you've done all that, and you now have an N-by-M matrix img of unsigned 16-bit integers. Since I don't know what format your text file is in, I can only suggest that you will probably need to use the function fscanf to read in all of your values (probably of type uint16), then you will likely have to reshape the values into an N-by-M image matrix using the function reshape. You first have to read your data from the text file into a matrix in MATLAB.
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