convert bitonal TIFF to bitonal PNG in C#

Question

I need to convert bitonal (black and white) TIFF files into another format for display by a web browser, currently we\'re using JPGs, but the format isn\'t crucial. From rea

Answer 1

Trying jaroslav's suggestion for color depth doesn't work:

static void Main(string[] args)
{
        var list = ImageCodecInfo.GetImageDecoders();
        var jpegEncoder = list[1]; // i know this is the jpeg encoder by inspection
        Bitmap bitmap = new Bitmap(500, 500);
        Graphics g = Graphics.FromImage(bitmap);
        g.DrawRectangle(new Pen(Color.Red), 10, 10, 300, 300);
        var encoderParams = new EncoderParameters();
        encoderParams.Param[0] = new EncoderParameter(Encoder.ColorDepth, 2);
        bitmap.Save(@"c:\newbitmap.jpeg", jpegEncoder, encoderParams);

}

The jpeg is still a full color jpeg.

I don't think there is any support for grayscale jpeg in gdi plus. Have you tried looking in windows imaging component?

http://www.microsoft.com/downloads/details.aspx?FamilyID=8e011506-6307-445b-b950-215def45ffffd8&displaylang=en

code example: http://www.codeproject.com/KB/GDI-plus/windows_imaging.aspx

wikipedia: http://en.wikipedia.org/wiki/Windows_Imaging_Component