使用Libtiff.net将BitmapSource保存为Tiff编码的JPEG

问题描述

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我正在尝试编写一个例程，该例程将使用LibTiff.net将WPF BitmapSource保存为JPEG编码的TIFF.使用LibTiff提供的示例，我得出以下结论:

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");
    }

这将转换图像，我可以看到JPEG图像，但是颜色混乱了.我猜我缺少TIFF的一个或两个标签，或者像光度学解释这样的错误，但是对于需要什么尚不完全清楚.

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.

干杯

推荐答案

目前尚不清楚您所说的颜色弄乱了"是什么意思，但可能应该将BitmapSource的BGR样本转换为LibTiff期望的RGB样本.净

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.

我的意思是，在将像素提供给WriteScanline方法之前，请确保颜色通道的顺序是RGB(很可能不是).

I mean, make sure the order of color channels is RGB (most probably, it's not) before feeding pixels to WriteScanline method.

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