How to change brightness of selected points of an image?
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I know that I can change brightness of an image using following instruction:
I=(readimage);
I1 = I - 100;
imshow(I1);
But I want to know that How can I change brightness of the image just in some specified points? For example a square of the image?
2 comentarios
Kevin Chng
el 18 de Oct. de 2018
Indexing your I will do
I([10 50],[10 50],:) = I([10 50],[10 50],:) - 100;
Respuestas (1)
Image Analyst
el 18 de Oct. de 2018
Try ginput():
uiwait(helpdlg('Click a point'));
[x, y] = ginput(1);
row = round(y);
col = round(x);
thisGrayLevel = grayImage(row, col);
grayImage(row, col) = thisGrayLevel ^2;
Beware that if your image is uint8 and the square goes beyond 255, it will clip to 255.
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