img=imread('rzeczka.jpg');
#-------------------------------
img_dbl = double(img);
img_r = img_dbl(:, :, 1);
vector = reshape(img_r, size(img_r,1)*size(img_r,2),1);
minimalna=min(vector);
wspKierunkowy = (200 - minimalna)/(255 - minimalna);
b = minimalna - (wspKierunkowy * minimalna);
for x= 1:size(img_dbl, 2)
for y = 1:size(img_dbl, 1)
if img_dbl(y,x,1) <= minimalna;
img_dbl(y,x,1)= 10;
else
img_dbl(y,x,1) > minimalna;
img_dbl(y,x,1)= img_dbl(y,x,1)*wspKierunkowy + b;
endif
endfor
endfor
img = img_dbl;
#-------------------------------
imshow(img_dbl/255);
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