MATLAB: Help for ‘imread’

image processingimread

Hi dear, Can someone help me telling me what this means?

img = imread('imgs/lego.png');

blue = img(:,:,1);

What return in 'blue'?

Best Answer

If imgs/lego.png is an RGB color image, then "blue" will hold the red channel information. If imgs/lego.png is a grayscale image, then "blue" will hold the brightness information. If imgs/lego.png is an indexed (pseudocolor) image, then "blue" will hold the index information but there will be no information available about what color each distinct index is to correspond to.

The first pane, (:,:,1) of an RGB image is the Red information. The second pane, (:,:,2) is the Green information. The third pane, (:,:,3) is the Blue information.

Related Solutions

MATLAB: How to get back the rgb image from r g b component

Exactly the opposite of how you pulled out the data;

im = imread(...);
red = im(:,:,1);
grn = im(:,:,2);
blu = im(:,:,3);
original_mk2 = zeros(size(im));
original_mk2(:,:,1) = red;
original_mk2(:,:,2) = grn;
original_mk2(:,:,3) = blu;
fiugre; imshow(original_mk2);

MATLAB: Read three different RGB band and Swap the Band

Try this:

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Now swap around in any way you want.
newRedChannel = greenChannel;
newGreenChannel = blueChannel; 
newBlueChannel = redChannel;
% Recombine separate color channels into a single, true color RGB image.
NewRgbImage = cat(3, newRedChannel, newGreenChannel, newBlueChannel);

Best Answer

Related Solutions

MATLAB: How to get back the rgb image from r g b component

MATLAB: Read three different RGB band and Swap the Band

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