前记：前前后后一年时间，有时间就扒资料，终于弄出来了。这个程序是读取一个彩色tiff图，将其像素提取出来，赋给新建的tiff文件。拷贝运行此程序前，先配置好libtiff环境（网上有很多资源，也可以下载我收藏的的源码文件：http://download.csdn.net/download/fx_odyssey/9838235，直接拷贝到工程目录下。），另外将lena.tif彩色文件放置在工程目录下。
#include <iostream> #include <stdlib.h> #include <Windows.h> #include "tiffio.h" using namespace std; void CreatTiffFile(const char *FileName, unsigned char *Buf, uint32 width, uint32 height); int main() { TIFF *tifFile = TIFFOpen("lena.tif", "r"); //提前在工程目录下放入 lena.tif 的文件，“r”表示读写权限为“读” int width, height; TIFFGetField(tifFile, TIFFTAG_IMAGEWIDTH, &width); TIFFGetField(tifFile, TIFFTAG_IMAGELENGTH, &height); int pixelCount = width * height; unsigned int *image = new unsigned int[pixelCount]; TIFFReadRGBAImage(tifFile, width, height, image, 1); unsigned char *R = new unsigned char[pixelCount]; unsigned char *G = new unsigned char[pixelCount]; unsigned char *B = new unsigned char[pixelCount]; unsigned char *A = new unsigned char[pixelCount]; for (int i = 0; i < pixelCount; i++) { R[i] = 0x00; G[i] = 0x00; B[i] = 0x00; A[i] = 0x00; } unsigned int *rowPointerToSrc = image + width * (height - 1); unsigned char *rowPointerToR = R; unsigned char *rowPointerToG = G; unsigned char *rowPointerToB = B; unsigned char *rowPointerToA = A; for (int y = 0; y < height; y++) { unsigned int *colPointerToSrc = rowPointerToSrc; unsigned char *colPointerToR = rowPointerToR; unsigned char *colPointerToG = rowPointerToG; unsigned char *colPointerToB = rowPointerToB; unsigned char *colPointerToA = rowPointerToA; //cout << "第 " << y+1 << " 行：" << endl; for (int x = 0; x < width; x++) { colPointerToR[0] = (unsigned char)TIFFGetR(colPointerToSrc[0]); colPointerToG[0] = (unsigned char)TIFFGetG(colPointerToSrc[0]); colPointerToB[0] = (unsigned char)TIFFGetB(colPointerToSrc[0]); colPointerToA[0] = (unsigned char)TIFFGetA(colPointerToSrc[0]); //cout << "\tR:" << (int)colPointerToR[0] << "\tG:" << (int)colPointerToG[0] << "\tB:" << (int)colPointerToB[0] << "\tA:" << (int)colPointerToA[0] << endl; colPointerToSrc++; colPointerToR++; colPointerToG++; colPointerToB++; colPointerToA++; } rowPointerToSrc -= width; rowPointerToR += width; rowPointerToG += width; rowPointerToB += width; rowPointerToA += width; } delete image; uint32 pixel = height * width * 3; BYTE *pic = new BYTE[pixel]; for (uint32 i = 0; i < pixelCount; i++) { pic[i*3] = R[i]; pic[i*3+1] = G[i]; pic[i*3+2] = B[i]; } delete R; delete G; delete B; delete A; const char *fileName = "test.tif"; CreatTiffFile(fileName, pic, width, height); return 0; } void CreatTiffFile(const char *FileName, unsigned char *Buf, uint32 width, uint32 height) { TIFF *imageTest = TIFFOpen(FileName, "w"); if (imageTest == NULL) { printf("Could not open output.tif for writing\n"); cout << "open is failed.\n"; system("pause"); exit(1); } TIFFSetField(imageTest, TIFFTAG_IMAGEWIDTH, width); TIFFSetField(imageTest, TIFFTAG_IMAGELENGTH, height); TIFFSetField(imageTest, TIFFTAG_BITSPERSAMPLE, 8);// bits per channel (sample) 每个通道（样本） TIFFSetField(imageTest, TIFFTAG_SAMPLESPERPIXEL, 3);// samples per pixel 每像素采样 TIFFSetField(imageTest, TIFFTAG_ROWSPERSTRIP, height); // rows per strip of data 每条数据行（写入像素的高度限制） //TIFFSetField(imageTest, TIFFTAG_COMPRESSION, COMPRESSION_CCITTFAX4); TIFFSetField(imageTest, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB); TIFFSetField(imageTest, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB); TIFFSetField(imageTest, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG); TIFFSetField(imageTest, TIFFTAG_XRESOLUTION, 600.0); TIFFSetField(imageTest, TIFFTAG_YRESOLUTION, 600.0); TIFFSetField(imageTest, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH); //Write the information to the file TIFFWriteEncodedStrip(imageTest, 0, Buf, width * height * 3); TIFFClose(imageTest); //return true; }
如果是想写灰度图，将TIFFSetField(imageTest, TIFFTAG_SAMPLESPERPIXEL, 3);中3改为1，Buf的数据大小改为width*height即可。
