Generate an indexed image

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How do I create an indexed image to import into Matlab?. Thanks

Accepted Answer

Image Analyst
Image Analyst on 1 Dec 2021
Try this:
% Demo by Image Analyst
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
markerSize = 40;
% Read in original RGB image and display it.
originalImage = imread('peppers.png');
subplot(2, 1, 1);
title('Original Image', 'FontSize', fontSize)
% Create indexed image with 6 colors.
numColors = 6;
[indexedImage, cmap] = rgb2ind(originalImage, numColors);
% Save it to disk.
imwrite(indexedImage, cmap, 'indexedImage.png');
% Read indexed image back in from disk.
[recalledImage, storedColorMap] = imread('indexedImage.png');
% Display it.
subplot(2, 1, 2);
imshow(recalledImage, 'Colormap', storedColorMap);
caption = sprintf('Indexed Image with %d Colors', numColors);
title(caption, 'FontSize', fontSize)
% Display color bar and adjust range from 0-255 to 0-numColors.
caxis([0, numColors])
% Maximize figure window.
g = gcf;
g.WindowState = 'maximized';

More Answers (1)

Benjamin Kraus
Benjamin Kraus on 1 Dec 2021
Are you trying to create an indexed image in MATLAB? Or are you asking what programs (aside from MATLAB) can be used to create indexed image?
Some resources that may help:
If those links don't help, I think you are going to need to add a lot more detail to your question to get a helpful answer.
Claudia Lucia Silva Olvera
Hi Benjamin
The truth did not know that the transformation could be done in MATLAB.
Nice day

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