CODEWITHSUNDEEP
matlabimage-processingbrightnesscontrastindexed-image
E. Zahra
E. Zahra

Reputation: 165

Adjusting brightness and contrast for indexed images

I am changing the image brightness for an indexed image in MATLAB. For that I created m, a 3x256 ones matrix, then I multiply it with a number, then I add m to x (the map for my image). My question now how to return one if the result is bigger than one.

[im3,x]=imread('corn.tif');
m=ones(256,3)
m=m.*50
[im33 c]=deal(im3,x+m)

Upvotes: 0

Views: 333

Answers (1)

Cris Luengo
Cris Luengo

Reputation: 60474

Setting values in the array x larger than the value a to a is variously called clamping, clipping or saturating. The simplest method is using min:

x = min(x,a);

For example, given your color map x:

[im3,x] = imread('corn.tif');

subplot(1,2,1)
imshow(im3,x)

x = x + 0.2;
x = min(x,1);

subplot(1,2,2)
imshow(im3,x)

Upvotes: 3

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