CODEWITHSUNDEEP
c#wpflibtiff.net
Kevin Suppan
Kevin Suppan

Reputation: 232

LibTiff.NET Tiff to WPF Image

I'm using LibTiff.NET to read a multipage Tiff file. It's no problem to convert my Tiff into a System.Drawing.Bitmap, since it's shown on their website, but what I want is a BitmapSource or something comparable to use in WPF. Of course, I can convert the already converted System.Drawing.Bitmap, but since the amount of data is quite big, I am looking for a method to convert directly from the Tiff object.

Any suggestions? Maybe with the ReadRGBAImage method, that returns an int array with the colors?

Edit1:

I tried the following but only get an image consisting of gray stripes:

int[] raster = new int[height * width];
im.ReadRGBAImage(width, height, raster);
byte[] bytes = new byte[raster.Length * sizeof(int)];

Buffer.BlockCopy(raster, 0, bytes, 0, bytes.Length);

int stride = raster.Length / height;
image.Source = BitmapSource.Create(
     width, height, dpiX/*ex 96*/, dpiY/*ex 96*/,
     PixelFormats.Indexed1, BitmapPalettes.BlackAndWhite, bytes, 
     /*32/*bytes/pixel * width*/ stride);

Edit2:

Maybe this helps, it is for conversion to System.Drawing.Bitmap.

Upvotes: 2

Views: 1234

Answers (1)

Dmitry
Dmitry

Reputation: 2062

Ok I've downloaded the lib. The full solution is:

byte[] bytes = new byte[imageSize * sizeof(int)];
int bytesInRow = width * sizeof(int);
//Invert bottom and top
for (int row = 0; row < height; row++)
    Buffer.BlockCopy(raster, row * bytesInRow, bytes, (height - row -1) * bytesInRow, bytesInRow);


//Invert R and B bytes
byte tmp;
for (int i = 0; i < bytes.Length; i += 4)
{
    tmp = bytes[i];
    bytes[i] = bytes[i + 2];
    bytes[i + 2] = tmp;
}

int stride = width * 4;
Image = BitmapSource.Create(
        width, height, 96, 96,
        PixelFormats.Pbgra32, null, bytes, stride);

The solution is a bit more complex. In fact WPF don't support rgba32 format. So to display the image correctly R and B bytes should be swapped. Another tric is that tif image is loaded upside down. This needs some additional manipulation.

Hope this helps.

Upvotes: 1

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