标签:photoshop 图像处理 算法 颜色空间 色阶调整
前言:之前在公司做项目的用到photoshop颜色空间的一些相关方法,在此总结一下。下面原理部分是从我的总结文档里截取来的。需要复制的童鞋自己手写一下~
2、程序部分
1)Matlab实验程序。
clc;clear;close all; Image=imread('Fotor_LomoOrg.bmp'); figure(1); imshow(Image); R=double(Image(:,:,1)); G=double(Image(:,:,2)); B=double(Image(:,:,3)); %调整参数 HighLight=238; Shadow=159; Midtones=0.51; Diff=HighLight-Shadow; rDiff=R-Shadow; gDiff=G-Shadow; bDiff=B-Shadow; rDiff(rDiff<0)=0; gDiff(gDiff<0)=0; bDiff(bDiff<0)=0; R=(rDiff/Diff).^(1/Midtones)*255; G=(gDiff/Diff).^(1/Midtones)*255; B=(bDiff/Diff).^(1/Midtones)*255; R(R>255)=255; G(G>255)=255; B(B>255)=255; img(:,:,1)=uint8(R); img(:,:,2)=uint8(G); img(:,:,3)=uint8(B); figure(2); imshow(img); </span>
void LevelAdjustRGB(unsigned char *pSrc, unsigned char *pDest, int nWidth, int nHeight,int nShadow,int nHighLight,double dMidtone) { //局部变量声明 int i = 0; int nLength = nWidth * nHeight; double dDiff = nHighLight-nShadow; int *nRgbDiff = new int[3 * nLength]; for(i = 0;i < 3 * nLength; i++) { nRgbDiff[i] = pSrc[i] - nShadow; if(nRgbDiff[i] < 0) { nRgbDiff[i] = 0; } //此处必须用int作为中间变量 不能用char 会有数据截断 int nTemp = static_cast<int>(pow((nRgbDiff[i] / dDiff),1 / dMidtone) * 255); pDest[i] = CLIP8(nTemp); } //释放空间 if(!nRgbDiff) { delete []nRgbDiff; nRgbDiff = NULL; } }</span>
#define CLIP8(a) (((a) & 0xFFFFFF00) ? (((a) < 0) ? 0 : 255 ) : (a)) ///<判断8位数据范围
3、实验结果,同photoshop处理结果
图1 原图
图2 nShadow=159
nHighLight=238 dMidtone=0.51结果
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标签:photoshop 图像处理 算法 颜色空间 色阶调整
原文地址:http://blog.csdn.net/xingyanxiao/article/details/48034857