MATLAB: IMAGE 3D into 2D

image processing 3d 2d

I need to change a 3D image into 2D. However the image should stay as coloured, not gray. Because I need to generate the histogram; and imhist() only works on 2D coloured image.

Best Answer

[indI, cmapI] = rgb2ind(I);
imhist(indI, cmapI)

Related Solutions

MATLAB: Trouble using imhist in image

You're passing in a color image and imhist() is not set up for that. If you want 3 histograms, extract each color channel independently,

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

like in the attached demo, and histogram each color channel one at a time. Or if you don't care which color channel, then just lump them all together with (:)

imhist(rgbImage(:));

MATLAB: 8 bit depth RGB image(gif)

Copy and paste this example code:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;
% Change the filename to your filename!
[gifImage cmap] = imread('C:\Users\yourname\Pictures\whatever.gif');
% Display indexed GIF image.
subplot(2,3, 1);
imshow(gifImage);
% Convert to true color RGB image.
rgbImage = ind2rgb(gifImage, cmap);
title('GIF Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
subplot(2,3, 2);
imshow(rgbImage);
title('After conversion to RGB', 'FontSize', fontSize);
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Display the three component color channels.
subplot(2,3, 4);
imshow(redChannel);
title('Red Channel', 'FontSize', fontSize);
subplot(2,3, 5);
imshow(greenChannel);
title('Green Channel', 'FontSize', fontSize);
subplot(2,3, 6);
imshow(blueChannel);
title('Blue Channel', 'FontSize', fontSize);

Best Answer

Related Solutions

MATLAB: Trouble using imhist in image

MATLAB: 8 bit depth RGB image(gif)

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