版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/fengxianghui01/article/details/85075994
反色的实际含义是将 R、G、B 值反转。若颜色的量化级别是 256,则新图的 R、G、B 值为255 减去原图的 R、G、B 值。这里针对的是所有图,包括真彩图、带调色板的彩色图(又称为伪彩色图)、和灰度图。针对不同种类有不同的处理。
#include <Windows.h>
#include <stdlib.h>
#include <stdio.h>
int main(int* argc, char** argv)
{
FILE* fp = fopen("./01.bmp", "rb");
if (fp == 0)
return 0;
BITMAPFILEHEADER fileHead;
fread(&fileHead, sizeof(BITMAPFILEHEADER), 1, fp);
BITMAPINFOHEADER infoHead;
fread(&infoHead, sizeof(BITMAPINFOHEADER), 1, fp);
int width = infoHead.biWidth;
int height = infoHead.biHeight;
int biCount = infoHead.biBitCount;
RGBQUAD *pColorTable;
pColorTable = new RGBQUAD[256];
fread(pColorTable, sizeof(RGBQUAD), 256, fp);
int pColorTableSize = 1024;
int lineByte = (biCount*width / 8 + 3) / 4 * 4;
unsigned char *pBmpBuf;
pBmpBuf = new unsigned char[lineByte*height];
fread(pBmpBuf, lineByte*height, 1, fp);
fclose(fp);
unsigned char *pBmpBuf1;
pBmpBuf1 = new unsigned char[lineByte*height];
for (int i = 0; i < width; ++i){
for (int j = 0; j < height; ++j){
*(pBmpBuf1 + lineByte*i + j) = 255;
}
}
for (int i = 0; i < height; ++i){
for (int j = 0; j < width; ++j){
*(pBmpBuf1 + lineByte*i + j) = 255-*(pBmpBuf + lineByte*i + j);
}
}
FILE* fop = fopen("./reverse.bmp", "wb");
fwrite(&fileHead, sizeof(BITMAPFILEHEADER), 1, fop);
fwrite(&infoHead, sizeof(BITMAPINFOHEADER), 1, fop);
fwrite(pColorTable, sizeof(RGBQUAD), 256, fop);
fwrite(pBmpBuf1, lineByte*height, 1, fop);
fclose(fop);
system("pause");
return 0;
}
实验结果:
原图 反转图
实验结果分析:实验图为灰度图,且反转的方式并不是对调色板反转,而是直接对位图数据反转(即T=255-T),实验结果为负片
后续持续更新用C语言实现图像处理算法,敬请期待,欢迎关注。