我正在尝试将多个.tif
文件合并为一个,但合并后,新.tif
文件的图像质量非常低。
如何提高质量?
我希望新的合并文件质量为原始质量。我正在使用此代码合并tif文件
string[] sa = path;
ImageCodecInfo info = null;
foreach (ImageCodecInfo ice in ImageCodecInfo.GetImageEncoders())
if (ice.MimeType == "image/tiff")
info = ice;
Encoder enc = Encoder.SaveFlag;
EncoderParameters ep = new EncoderParameters(1);
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
Bitmap pages = null;
int frame = 0;
foreach (string s in sa)
{
// using (FileStream fileStream = System.IO.File.Open(s, FileMode.Open))
{
if (frame == 0)
{
pages = (Bitmap)Image.FromFile(s);
//save the first frame
pages.Save(filepath, info, ep);
}
else
{
//save the intermediate frames
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
Bitmap bm = (Bitmap)Image.FromFile(s);
pages.SaveAdd(bm, ep);
}
if (frame == sa.Length - 1)
{
//flush and close.
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
pages.SaveAdd(ep);
}
frame++;
}
}
答案 0 :(得分:0)
不是100%肯定这个,但我相信默认情况下使用G3编码多帧TIFF。只是尝试一下,改变一下:
Encoder enc = Encoder.SaveFlag;
EncoderParameters ep = new EncoderParameters(1);
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
到此:
Encoder enc = Encoder.SaveFlag;
Encoder encComp = Encoder.Encoder.Compression;
EncoderParameters ep = new EncoderParameters(2);
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
ep.Param[1] = new EncoderParameter(encComp, (long)EncoderValue.CompressionLZW);
再试一次(您也可以使用CompressionNone
代替CompressionLZW
,但LZW无损,因此不应降低质量)