应用CCITT COM pression我的TIFF文件后，它产生的图像具有坚实的黑色背景 [英] After applying CCITT compression on my Tiff File, it produces an image with a solid black background
问题描述
创建TIFF文件，与LZW COM pression（默认）： -
Creating tiff file, with LZW compression (default):-
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(800, 1000);
Graphics g = Graphics.FromImage(bitmap);
g.DrawString("Name: " + Name.Text, outputFont, Brushes.Black, new PointF(0, 20));
g.DrawString("Date Of Birth: " + Date_Of_Birth.Text, outputFont, Brushes.Black, new PointF(0, 40));
g.DrawString("Address: " + Address.Text, outputFont, Brushes.Black, new PointF(0, 60));
g.DrawString("City: " + City.Text, outputFont, Brushes.Black, new PointF(0, 80));
g.DrawString("State: " + State.Text, outputFont, Brushes.Black, new PointF(0, 100));
g.DrawString("Zip Code: " + Zip_Code.Text, outputFont, Brushes.Black, new PointF(0, 120));
g.DrawString("Phone: " + Phone.Text, outputFont, Brushes.Black, new PointF(0, 140));
g.DrawString(" ID: " + ID.Text, outputFont, Brushes.Black, new PointF(0, 160));
fileName = saveDirectory + id + ".tif";
bitmap.Save(fileName, ImageFormat.Tiff);
所以，我想它的COM pression改为CCITT： -
So I am trying to change its compression to CCITT:-
Bitmap myBitmap;
myBitmap = new Bitmap(fileName);
ImageCodecInfo myImageCodecInfo;
myImageCodecInfo = GetEncoderInfo("image/tiff");
System.Drawing.Imaging.Encoder myEncoder;
myEncoder = System.Drawing.Imaging.Encoder.Compression;
EncoderParameters myEncoderParameters;
myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter;
myEncoderParameter = new EncoderParameter(myEncoder,(long)EncoderValue.CompressionCCITT4);
myEncoderParameters.Param[0] = myEncoderParameter;
myBitmap.Save(new_fileName, myImageCodecInfo, myEncoderParameters);
private static ImageCodecInfo GetEncoderInfo(String mimeType)
{
int j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
}
return null;
}
这个过程是我可以看到我的TIFF文件的COM pression类型是否正确被修改为CCITT（通过右击输出文件和检查属性）。
然而，当我尝试打开它，在黑色的..没有了整幅图像就可以了。
The process works and I can see that the compression type of my tiff file has correctly been modified to CCITT (by right clicking on the output file and checking properties). However when I try to open it, the whole image in black.. nothing is on it.
当我更改COM pression类型LZW或无或RLE那么TIFF文件又是一次的可视图像。
When I change the compression type to LZW or None or RLE then the tiff file is once again a viewable image.
不幸的是我只需要CCITT格式。谁能帮我算出这个？
Unfortunately I need the CCITT format only. Can anyone help me figure this out?
更新：
尽管方法现在在我的Windows作品使用Visual Studio 2010。一旦发布到Windows 2008的服务器7 32位操作系统，该解决方案不起作用（仅适用于CCITT COM pression技术）。下面的链接解释了原因。
Even though the method now works on my windows 7 32 bit OS using Visual studio 2010.. Once published to the Windows 2008 server, the solution doesn't work (only for CCITT compression techniques). The following link explains why.
<一个href=\"http://social.msdn.microsoft.com/Forums/vstudio/en-US/1585c562-f7a9-4cfd-9674-6855ffaa8653/parameter-is-not-valid-for-com$p$pssionccitt4-on-windows-server-2003-and-2008?forum=netfxbcl\" rel=\"nofollow\">http://social.msdn.microsoft.com/Forums/vstudio/en-US/1585c562-f7a9-4cfd-9674-6855ffaa8653/parameter-is-not-valid-for-com$p$pssionccitt4-on-windows-server-2003-and-2008?forum=netfxbcl
根据这篇文章，这就是我想，但不能得到COM pression应用到原始图像： -
As per this article, this is what I am trying but can't get the compression to apply to the original image:-
int width = 800;
int height = 1000;
int stride = width/8;
byte[] pixels = new byte[height*stride];
// Try creating a new image with a custom palette.
List<System.Windows.Media.Color> colors = new List<System.Windows.Media.Color>();
colors.Add(System.Windows.Media.Colors.Red);
colors.Add(System.Windows.Media.Colors.Blue);
colors.Add(System.Windows.Media.Colors.Green);
BitmapPalette myPalette = new BitmapPalette(colors);
// Creates a new empty image with the pre-defined palette
BitmapSource image = BitmapSource.Create(
width,
height,
96,
96,
System.Windows.Media.PixelFormats.BlackWhite,
myPalette,
pixels,
stride);
FileStream stream = new FileStream(Original_File, FileMode.Create);
TiffBitmapEncoder encoder = new TiffBitmapEncoder();
encoder.Compression = TiffCompressOption.Ccitt4;
encoder.Frames.Add(BitmapFrame.Create(image));
encoder.Save(stream);
不过，我最终的结果是正确的COM pression一个文件，而是一个坚实的黑色背景。似曾相识。
However, my end result is a file with the correct compression, but a solid black background. Deja Vu.
推荐答案
编辑code这样，你就可以使用所需的COM pression没有黑色背景填充：
Edit your code as such, and you will be able to use your desired compression without the black background fill:
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(800, 1000);
Graphics g = Graphics.FromImage(bitmap);
/* Add this */ g.FillRectangle(Brushes.White, new Rectangle(0,0, 800, 1000));
g.DrawString("Name: " + Name.Text, outputFont, Brushes.Black, new PointF(0, 20));
g.DrawString("Date Of Birth: " + Date_Of_Birth.Text, outputFont, Brushes.Black, new PointF(0, 40));
g.DrawString("Address: " + Address.Text, outputFont, Brushes.Black, new PointF(0, 60));
g.DrawString("City: " + City.Text, outputFont, Brushes.Black, new PointF(0, 80));
g.DrawString("State: " + State.Text, outputFont, Brushes.Black, new PointF(0, 100));
g.DrawString("Zip Code: " + Zip_Code.Text, outputFont, Brushes.Black, new PointF(0, 120));
g.DrawString("Phone: " + Phone.Text, outputFont, Brushes.Black, new PointF(0, 140));
g.DrawString(" ID: " + ID.Text, outputFont, Brushes.Black, new PointF(0, 160));
fileName = saveDirectory + id + ".tif";
bitmap.Save(fileName, ImageFormat.Tiff);
这篇关于应用CCITT COM pression我的TIFF文件后，它产生的图像具有坚实的黑色背景的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
