I'm trying to write a routine that will save a WPF BitmapSource as a JPEG encoded TIFF using LibTiff.net. Using the examples provided with LibTiff I came up with the following:
private void SaveJpegTiff(BitmapSource source, string filename)
{
if (source.Format != PixelFormats.Rgb24) source = new FormatConvertedBitmap(source, PixelFormats.Rgb24, null, 0);
using (Tiff tiff = Tiff.Open(filename, "w"))
{
tiff.SetField(TiffTag.IMAGEWIDTH, source.PixelWidth);
tiff.SetField(TiffTag.IMAGELENGTH, source.PixelHeight);
tiff.SetField(TiffTag.COMPRESSION, Compression.JPEG);
tiff.SetField(TiffTag.PHOTOMETRIC, Photometric.RGB);
tiff.SetField(TiffTag.ROWSPERSTRIP, source.PixelHeight);
tiff.SetField(TiffTag.XRESOLUTION, source.DpiX);
tiff.SetField(TiffTag.YRESOLUTION, source.DpiY);
tiff.SetField(TiffTag.BITSPERSAMPLE, 8);
tiff.SetField(TiffTag.SAMPLESPERPIXEL, 3);
tiff.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);
int stride = source.PixelWidth * ((source.Format.BitsPerPixel + 7) / 8);
byte[] pixels = new byte[source.PixelHeight * stride];
source.CopyPixels(pixels, stride, 0);
for (int i = 0, offset = 0; i < source.PixelHeight; i++)
{
tiff.WriteScanline(pixels, offset, i, 0);
offset += stride;
}
}
MessageBox.Show("Finished");
}
This converts the image and I can see a JPEG image but the colours are messed up. I'm guessing I'm missing a tag or two for the TIFF or something is wrong like the Photometric interpretation but am not entirely clear on what is needed.
Cheers,
It's not clear what do you mean by saying " colours are messed up" but probably you should convert BGR samples of BitmapSource
to RGB ones expected by LibTiff.Net.
I mean, make sure the order of color channels is RGB (most probably, it's not) before feeding pixels to WriteScanline
method.
来源:https://stackoverflow.com/questions/12557127/saving-bitmapsource-as-tiff-encoded-jpeg-using-libtiff-net