Hi Mdm/Sir,

How do I set the image property to black and white (monochrome) when convert from PDF to Tiff using PdfConverter?

Thank You.

Kind Regards,

Caymond

Hello Caymond,

Thanks for considering Aspose.

I am sorry to inform you that currently PdfConverter has no such property that can be used for converting Pdf to Monochrome Tiff. As a work around this can be done through code.

First convert the Pdf to Tiff, than we need to convert Tiff to BMP (as we cannot convert Colored Tiff to Monochrome Tiff directly) & than convert the BMP to Monochrome and save as Tiff.

Please see the following code snippet developed in C#.Net

PdfConverter converter = new PdfConverter();
converter.BindPdf(@"C:\Temp\UpdaetdFormated.pdf");
converter.DoConvert();
converter.SavaAsTIFF(@"C:\Temp\Converted.tiff");

// Code to convert Tiff file to BMP

Guid myGuid;
FrameDimension myDimension;
int myPageCount;
Image myImage;

FileStream fs = new FileStream("C:\\Temp\\Converted.tiff", FileMode.Open);
myImage = Image.FromStream(fs);
myGuid = myImage.FrameDimensionsList[0];
myDimension = new FrameDimension(myGuid);
myPageCount = myImage.GetFrameCount(myDimension);

for (int i = 0; i < myPageCount; i++)
{
myImage.SelectActiveFrame(myDimension, i);
myImage.Save("C:\\temp\\ConvertedtoBMP.BMP", ImageFormat.Bmp);
}
fs.Close();

// Code to convert BMP to Monochrome and Save in Tiff Format

Image img = new Bitmap("C:\\temp\\ConvertedtoBMP.BMP");
Bitmap bm = new Bitmap(img.Width, img.Height);
Graphics g = Graphics.FromImage(bm);
ColorMatrix cm = new ColorMatrix(new float[][]{ new float[]{0.5f,0.5f,0.5f,0,0},
new float[]{0.5f,0.5f,0.5f,0,0},
new float[]{0.5f,0.5f,0.5f,0,0},
new float[]{0,0,0,1,0,0},
new float[]{0,0,0,0,1,0},
new float[]{0,0,0,0,0,1}});

ImageAttributes ia = new ImageAttributes();

ia.SetColorMatrix(cm);
g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, ia);
g.Dispose();
bm.Save("C:\\Temp\\Monochrome.tiff", ImageFormat.Tiff);

For conversion of BMP to monochrome we have used ColorMatrix Class.