MATLAB: Setting Display Range for RGB Colors

imshowrgb

Hi,

The function imshow(I,[low high]) allows you to set the display range for a grayscale color based on the parameters low and high. Can the same be done for an RGB color without manually editing the array?

Thanks!

Best Answer

No, it can't. It happens automatically. Even for 16 (48) bit color images, it automatically scales them to 8(24) bit for display on your 8(24 or 32) bit computer monitor. If you didn't want that or like how that looks you'll have to actually change your array before you display it.

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MATLAB: Graphing colors

You can use the few matlab built in colors ('red','green,'blue,'black','white','cyan','magenta','yellow'),

plot(...,'color','green',...)

but you could also just declare a variable that is that vector, i.e.

g = [0 0 1]
plot(...,'color',g,...)

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)

Best Answer

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