无法将TIFF文件读入Bitmap对象 [英] Can't read a TIFF file into a Bitmap object

问题描述

大家好;

请查看
TiffIssue.zip 。这有一个测试程序来显示问题和有问题的tiff文件。 Paint可以打开tiff文件，但是Bitmap类会尝试实例化它。

Please look at TiffIssue.zip. This has a test program to show the issue and the problematic tiff file. Paint can open the tiff file but the Bitmap class throws an exception trying to instantiate it.

知道为什么吗？

谢谢 - 戴夫

过去6个月我们做了什么 -
使世界上最酷的报道和docgen系统更加惊人

What we did for the last 6 months - Made the world's coolest reporting & docgen system even more amazing

推荐答案

嗨DavidThi808，

Hi DavidThi808,

感谢您发布此处。

对于您的问题，如果您想阅读带有位图的TIFF，请尝试以下代码。

For your question, if you want to read TIFF with Bitmap, please try the code below.

 class TIFF_to_Bitmap
    {
        static void Main(string[] args)
        {
            string filename = "1.jpg";
            Bitmap oBmp = TiffToBitmap("image1.tif");
            oBmp.Save(filename);
            Bitmap bmp = new Bitmap(new FileStream(filename, FileMode.Open, FileAccess.Read));
            Console.Out.WriteLine("open successful");
            Console.ReadKey();
        }
        private static Bitmap TiffToBitmap(string asTiffFile)
        {
            Bitmap bmp = null;
            try
            {
                bmp = (Bitmap)Bitmap.FromFile(asTiffFile);
                return bmp;
            }
            catch
            {
            }
            Tiff tif = Tiff.Open(asTiffFile, "r");
            if (tif == null)
            {
                return null;
            }
            // Find the width and height of the image
            FieldValue[] value = tif.GetField(TiffTag.IMAGEWIDTH);
            int width = value[0].ToInt();

            value = tif.GetField(TiffTag.IMAGELENGTH);
            int height = value[0].ToInt();

            // Read the image into the memory buffer
            int[] raster = new int[height * width];

            if (!tif.ReadRGBAImage(width, height, raster))
            {
                tif.Close();
                tif.Dispose();
                return null;
            }
            tif.Close();
            tif.Dispose();
            // bitmap 
            bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
            Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
            BitmapData bmpdata = bmp.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
            byte[] bits = new byte[bmpdata.Stride * bmpdata.Height];

            for (int y = 0; y < bmp.Height; y++)
            {
                int rasterOffset = y * bmp.Width;
                int bitsOffset = (bmp.Height - y - 1) * bmpdata.Stride;

                for (int x = 0; x < bmp.Width; x++)
                {
                    int rgba = raster[rasterOffset++];
                    bits[bitsOffset++] = (byte)((rgba >> 16) & 0xff);
                    bits[bitsOffset++] = (byte)((rgba >> 8) & 0xff);
                    bits[bitsOffset++] = (byte)(rgba & 0xff);
                }
            }
            Marshal.Copy(bits, 0, bmpdata.Scan0, bits.Length);
            bmp.UnlockBits(bmpdata);
            return bmp;
        }

我将.tif文件转换为.jpg文件然后读取它。我显示.jpg文件。

I convert the .tif file to .jpg file and then read it. I show the .jpg file.

最好的问候，

Wendy

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