I want to get a* layer to continue processing.
MATLAB: How to convert rgb to Lab and display only a* layer with matlab
Image Processing Toolboxrgb to lab
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You need to have some way to tell the function what color should get mapped to what gray level. The colors are a 2D array with columns for red green, and blue in the range 0-1, and one row for each gray level or range of gray levels. There are several built-in color maps to select from - see the help for colormap. For example you could do
rgbImage = ind2rgb(grayImage, jet(256));colorbar;jet() is a function that builds a colormap of a certain pattern with the number of gray levels you specify. There are others too. Or you could make up your own colormap completely customized.
Try this:
rgbImage = imread('peppers.png');labImage = rgb2lab(rgbImage);lImage = labImage(:, :, 1);aImage = labImage(:, :, 2);bImage = labImage(:, :, 3);% Display everything
subplot(2, 2, 1);imshow(rgbImage);fontSize = 20;title('RGB Image', 'FontSize', fontSize);subplot(2, 2, 2);imshow(lImage, []);title('L Image', 'FontSize', fontSize);% Display everythingsubplot(2, 2, 3);imshow(aImage, []);title('A Image', 'FontSize', fontSize);% Display everythingsubplot(2, 2, 4);imshow(bImage, []);title('B Image', 'FontSize', fontSize);
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