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Insert image without conversion

Aspose.PDF Product Family
#1

Hi!

I had a problem. I’m trying to insert image to PDF. That image is tiff stream with CCITT Group 4 compression (monochrome).

But when it’s inserted to PDF - I see that it said that it stored as RGB

Means I expect to see in PDF something like this
/Type/XObject/Subtype/Image/Width 2550/Height 3608/Length 67743/ColorSpace/DeviceGray/BitsPerComponent 1/Filter/CCITTFaxDecode/DecodeParms

But I see
Filter/DCTDecode/Length 563278/Type/XObject/Subtype/Image/Width 2481/Height 3508/ColorSpace/DeviceRGB/BitsPerComponent 8/Name/Im

Any ideas how to insert image objects without extra processing in background?

#2

@vabrutski
Сould you provide the files and code (snippet) with which the problem occurs?
According to the description, it can be assumed that a flag must be set in order to be saved in BW.

#3

Hi Sergey. Thanks.

Which flag do you mean?

My tiff file is in CCITT 4 format (already 1 bit image)

I’m using code from that example https://docs.aspose.com/pdf/net/convert-images-format-to-pdf/#convert-tiff-to-pdf

    public static void TiffToPDF2()
{
    // Initalize new Document
    Document pdf = new Document();

    //Load TIFF image into stream
    Bitmap bitmap = new Bitmap(File.OpenRead(_dataDir+"multipage.tif"));
    // Convert multi page or multi frame TIFF to PDF
    FrameDimension dimension = new FrameDimension(bitmap.FrameDimensionsList[0]);
    int frameCount = bitmap.GetFrameCount(dimension);

    // Iterate through each frame
    for (int frameIdx = 0; frameIdx <= frameCount - 1; frameIdx++)
    {
        Page page = pdf.Pages.Add();

        bitmap.SelectActiveFrame(dimension, frameIdx);

        MemoryStream currentImage = new MemoryStream();
        bitmap.Save(currentImage, ImageFormat.Tiff);

        Aspose.Pdf.Image imageht = new Aspose.Pdf.Image
        {
            ImageStream = currentImage,
            //Apply some other options
            //ImageScale = 0.5
        };
        page.Paragraphs.Add(imageht);
    }

    // Save output PDF file
    pdf.Save(_dataDir + "TifftoPDF.pdf");
}
#4

Ok. I got it. You speaking about IsBlackAndWhite for Image class.
In Documentation it said: “If TIFF image of CCITT subformat is used, this property must be set to true.”

It’s exactly my case.

Interesting that when I set it to true. Process stuck inside PdfDocument.Save(…)

#5

@vabrutski
Is it stuck or does it take a long time?
Perhaps you should wait longer.

#6

I found that it was a bug in my version of Aspose. I need to update and check again.
Thank you for idea with special option. Looks like it’s a right direction

#7

Another related quiestion. Probably you know.

IsBlackWhite is defined in Image class.

Image class I can add to paragraph. And when I do so - it doesn’t tak full widht\heigh of page.
How to do that with Image that I add to Paragrapth to be placed(stretched) full width\height

When I do page.AddImage - it works as expected, but there is no option for IsBaclWhite then

#8

@vabrutski
you need to set FixWidth and FixHeight for the image object.
code snippet

    string inFile = GetInputPath("untitled.png");
    string outFile = GetOutputPath("test.pdf");

    using (var doc = new Aspose.Pdf.Document())
    {
        var image = new Aspose.Pdf.Image
        {
            File = inFile,
            FixWidth = doc.PageInfo.Width,
            FixHeight = doc.PageInfo.Height,
            IsBlackWhite = true
        };

        var page = doc.Pages.Add();
        page.Paragraphs.Add(image);

        doc.Save(outFile);
    }
#9

Thanks. Finally I finf out that I need to do the same for page itsel, not only for image.

#10

@vabrutski
Glad you were able to resolve the issue.