CODEWITHSUNDEEP
c#bitmaplibtifflibtiff.net
Jim
Jim

Reputation: 16022

LibTiff.Net color image conversion

I am using Bit Miracle LibTiff.Net.

I cannot find any sample code to take a 32bpp ARGB colour image and write the bitmap to a TIFF using this library.

Has anyone else attempted this?

Here is my sample code. It produces a file, but it cannot be viewed by any software that I have.

EDIT: The code now works, but the colors are wrong!

public static void WriteTiff(Image image, string fileName)
{
    Bitmap target = image as Bitmap;
    BitmapData bmd = target.LockBits(
        target.GetRectangle(),
        ImageLockMode.ReadOnly,
        PixelFormat.Format32bppArgb);
    var bits = new byte[bmd.Stride * bmd.Height];
    Marshal.Copy(bmd.Scan0, bits, 0, bits.Length);
    target.UnlockBits(bmd);

    Tiff tiff = Tiff.Open(fileName, "w");
    tiff.SetField(TiffTag.IMAGEWIDTH, target.Width);
    tiff.SetField(TiffTag.IMAGELENGTH, target.Height);
    tiff.SetField(TiffTag.COMPRESSION, Compression.NONE);
    tiff.SetField(TiffTag.PHOTOMETRIC, Photometric.RGB);
    tiff.SetField(TiffTag.BITSPERSAMPLE, 8);
    tiff.SetField(TiffTag.SAMPLESPERPIXEL, 4);
    tiff.SetField(TiffTag.ROWSPERSTRIP, target.Height);
    tiff.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);

    tiff.WriteEncodedStrip(0, bits, bits.Length);
    tiff.Close();
}

Thanks

Upvotes: 1

Views: 2873

Answers (1)

Bobrovsky
Bobrovsky

Reputation: 14246

EDIT The latest build of LibTiff.Net contains samples for conversion of a System.Drawing.Bitmap to 32-bit or 24-bit color LZW compressed TIFF images.

There is also samples for conversion of a TIFF image to 32-bit or 24-bit System.Drawing.Bitmaps. /EDIT

You may also want to review "Graphics programming with LibTiff.Net" (part 1, part 2) article in documentation. It should give you basic information about creating color TIFF files.

Disclaimer: I am one of the maintainers of the library.

Upvotes: 1

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