clc;
clear all;
close all;
addpath('E:\PhotoShop Algortihm\Image Processing\PS Algorithm');
I=imread('4.jpg');
Image=double(I)/255;
[height, width, depth]=size(Image);
rNW=1.0; gNW=0.0; bNW=0.0;
rNE=1.0; gNE=1.0; bNE=0.0;
rSW=0.0; gSW=0; bSW=1.0;
rSE=0.0; gSE=1.0; bSE=0.0;
Img_new=Image;
for ii=1:height
for jj=1:width
fx = jj / width;
fy = ii / height;
p = rNW + (rNE - rNW) * fx;
q = rSW + (rSE - rSW) * fx;
r = ( p + (q - p) * fy );
r = min(max(r, 0), 1);
p = gNW + (gNE - gNW) * fx;
q = gSW + (gSE - gSW) * fx;
g = ( p + (q - p) * fy );
g = min(max(g, 0) ,1);
p = bNW + (bNE - bNW) * fx;
q = bSW + (bSE - bSW) * fx;
b = ( p + (q - p) * fy );
b = min(max(b, 0), 1);
Img_new(ii, jj, 1)=r;
Img_new(ii, jj, 2)=g;
Img_new(ii, jj, 3)=b;
end
end
imshow(Img_new);
imwrite(Img_new, 'out.jpg');
参考来源:http://www.jhlabs.com/index.html
效果图: