MATLAB: How to invert the colors in an image

grayscaleimage analysisImage Processing Toolboxmatrix

Hi, I want to invert the colors in a grayscale image that i am reading with matlab. Whenever the image is black, matlab gives me 0 values, and whenever the image is white matlab gives me certain values. I want to invert this so whenever is black matlab gives me the values and whenever is white matlab gives me 0 values. Can you help me with this? Thank you!

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 doc imcomplement

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MATLAB: How can i invert colors in an character image

I suppose you already converted the grayscale image to binary using im2bw(). Then, all you have to do is:

Img1 = bwmorph(1-Img,'skel',Inf);

The expression 1-Img converts all ones to zeros and vice versa.

Good luck!

Elyo Ravuna

MATLAB: Converting Colors to Other Colors

Load image

RGB = imread('image.png');

Image is stored as a nxmx3 matrix, where the 3 layers are red, green and blue pixel intensity and nxm is the resolution. Find pure red colors by finding the indices with strong red channels (1st layer close to 255) and weak green/blue channels (2nd and 3rd channels clsoe to zero).

mask = RGB(:,:,1)>230 & RGB(:,:,2)<1 & RGB(:,:,3)<1;

then you can use this mask to change the colors of your image

RGB(repmat(~mask,1,1,3)) = 0;
RGB(repmat(mask,1,1,3)) = 255;

imshow(RGB)

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Related Solutions

MATLAB: How can i invert colors in an character image

MATLAB: Converting Colors to Other Colors

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