MATLAB: How to create histograms for L a b channels separately in CIELAB color space.

cielabcolor spaceImage Processing Toolbox

How to create histograms for L a b channels separately in CIELAB color space.

Best Answer

Try this:

labImage = rgb2lab(rgbImage);
LImage = labImage(:, :, 1);
AImage = labImage(:, :, 2);
BImage = labImage(:, :, 3);

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MATLAB: How to code rbg colour intensity of an image????

you can extract all the three color planes using:

R = YourImage(:,:,1); % Red color plane
G = YourImage(:,:,2);   % Green color plane
B = YourImage(:,:,3);   % Blue color plane

MATLAB: Convert grayscale to RGB

Try it like this if you want to pick some color out of the jet colormap:

workspace;  % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Create a jet colormap
c = 128;
map = jet(c);
pO2value=double(109); % 109 is an arbitrary number out of 1:128
r = ceil(map(pO2value,1)*c)
g = ceil(map(pO2value,2)*c)
b = ceil(map(pO2value,3)*c)
% Now let's do it to a gray scale image.
% Read in a standard MATLAB gray scale demo image.
grayImage = imread('cameraman.tif');
handleToFigure2 = figure;
subplot(2,2,1);
imshow(grayImage);
title('Gray Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Convert the gray image into RGB so we can get it into hsv space.
rgbImage = cat(3, grayImage, grayImage, grayImage);
hsv = rgb2hsv(rgbImage);
% Make the hue plane of the hsv image this same hue
hsvOfThisPixel = rgb2hsv([r g b])
hsv(:, :, 1) = hsvOfThisPixel(1);
% Make the saturation 1 so we'll see color.
% Originally it was zero which meant that the image would be gray.
hsv(:, :, 2) = 1;
% Convert back to rgb space.
singleHueRGBImage = uint8(255*hsv2rgb(hsv));
% Display the new, single hue color image.
subplot(2, 2, 2);
imshow(singleHueRGBImage);
title('New, Single Hue Color Image', 'FontSize', fontSize);
message = sprintf('Done with demo.');
uiwait(msgbox(message));

Best Answer

Related Solutions

MATLAB: How to code rbg colour intensity of an image????

MATLAB: Convert grayscale to RGB

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