使用libtiff库生成tif文件，格式转换。

一、说明

该代码主要使用libtiff库，将T.6 格式文件转换成 T.4格式。

 

二、代码 

int  tiff2tiff(char *pSrcFile, char *pDstFile)
{
	TIFF* intiff;
	TIFF* outiff;

	uint32 width, height;
	uint16 bitspersample = 1;
	uint16 samplesperpixel = 1;
	uint16 compession = 1;

	float  xresolution, yresolution; //分辨率
	int    nTotalFrame;
	uint16 pageNum;

	tsize_t stripSize;
	uint32  imageOffset, result;
	int     stripMax, stripCount;
	char    *buffer;
	uint32  bufferSize;

	if ((intiff = TIFFOpen(pSrcFile, "r")) == NULL)
	{	
		return 0;
	}

	if ((outiff = TIFFOpen(pDstFile, "w")) == NULL)
	{		
		return 0;
	}
	//获取源文件的配置信息
	TIFFGetField(intiff, TIFFTAG_IMAGEWIDTH, &width);                // 图片得到宽度
	TIFFGetField(intiff, TIFFTAG_IMAGELENGTH, &height);              // 图片得到高度
	TIFFGetField(intiff, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel); // bits per channel (sample) 每个通道（样本）（1bit或者8bit）
	TIFFGetField(intiff, TIFFTAG_BITSPERSAMPLE, &bitspersample);     // samples per pixel 每像素采样（1通道或者3通道）
	TIFFGetField(intiff, TIFFTAG_XRESOLUTION, &xresolution);         // x分辨率          
	TIFFGetField(intiff, TIFFTAG_YRESOLUTION, &yresolution);         // y分辨率 
	nTotalFrame = TIFFNumberOfDirectories(intiff);                   // 获取文件总页数

																	 // Read in the possibly multiple strips
	stripSize = TIFFStripSize(intiff);
	stripMax = TIFFNumberOfStrips(intiff);
	bufferSize = TIFFNumberOfStrips(intiff) * stripSize;

	if ((buffer = (char*)malloc(bufferSize)) == NULL)
	{
		//CONV_Assert(__LINE__, "Could not allocate enough memory for the uncompressed image\n");
		return 0;
	}

	//将fax4图片信息分页写入到fax3中
	for (pageNum = 0; pageNum < nTotalFrame; pageNum++)
	{
		TIFFSetDirectory(intiff, pageNum);
		TIFFSetDirectory(outiff, pageNum);

		imageOffset = 0;
		for (stripCount = 0; stripCount < stripMax; stripCount++)
		{
			if ((result = TIFFReadEncodedStrip(intiff, stripCount, buffer + imageOffset, stripSize)) == -1)  //获取此页面数据
			{
				free(buffer);
				//CONV_Assert(__LINE__, "Read error on input strip number %d\n", stripCount);
				return 0;
			}
			imageOffset += result;
		}

		TIFFSetField(outiff, TIFFTAG_PAGENUMBER, pageNum);                           //页面数
		TIFFSetField(outiff, TIFFTAG_IMAGEWIDTH, width);
		TIFFSetField(outiff, TIFFTAG_IMAGELENGTH, height);
		TIFFSetField(outiff, TIFFTAG_BITSPERSAMPLE, bitspersample);
		TIFFSetField(outiff, TIFFTAG_SAMPLESPERPIXEL, samplesperpixel);
		TIFFSetField(outiff, TIFFTAG_ROWSPERSTRIP, height);
		TIFFSetField(outiff, TIFFTAG_COMPRESSION, COMPRESSION_CCITT_T4);       //压缩格式
		TIFFSetField(outiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
		TIFFSetField(outiff, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
		TIFFSetField(outiff, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
		TIFFSetField(outiff, TIFFTAG_XRESOLUTION, xresolution);                //像素分辨率-X
		TIFFSetField(outiff, TIFFTAG_YRESOLUTION, yresolution);                //像素分辨率-Y
		TIFFSetField(outiff, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
		TIFFWriteEncodedStrip(outiff, 0, buffer, bufferSize);                   //写文件
		TIFFWriteDirectory(outiff);
	}

	//关闭文件
	TIFFClose(outiff);
	TIFFClose(intiff);
	free(buffer);
	return 1;
}