Incorrect Frame Length

Aspose.Imaging Product Family
1

Hi Team,

The below variable pagesCount should have value a 6 but it coming 7.

NOPHI_6.7z (312.8 KB)

 using (TiffImage MultiFrameImage = (TiffImage)Image.Load("NOPHI_6.tif"))
 {
 			pagesCount = MultiFrameImage.Frames.Length;
 }
2

@Gpatil , we will review your request and answer you shortly!

3

Hi, @Gpatil !
Thank you for being so interested in Aspose.Imaging.
Considering your case it turns out the following:

  • This is not a bug
  • Your TIFF actually contains 7 frames, and some of the image viewers show that (e.g. IrfanViewer)
  • But Windows viewer shows only 6 because the image has a tag TiffTags.PageNumber with defined page count.

The following code could help you to understand this issue and work around such a case.

int pagesCount, frameLength;
int scanPageCount = 0;
using (TiffImage MultiFrameImage = (TiffImage)Image.Load("NOPHI_6.tif"))
{
	// Take the real page count this way,
	pagesCount = MultiFrameImage.PageCount;
	// or this way
	final TiffFrame[] frames = MultiFrameImage.Frames;
	frameLength = frames.Length;

	// TIFF specific processing...
	// if the first page has the PageNumber tag, we count only pages containing this tag.
	TiffDataType tagWithPageNumbers = frames[0].FrameOptions.GetTagByType(TiffTags.PageNumber);
	if (tagByType != null)
	{
		int[] value = (int[]) tagByType.Value;
		// second value is the total count of scanned pages, the first one is the index starting from zero
		scanPageCount = value[1];
	}

	if (scanPageCount != 0)
	{
		// this code will export only pages with the PageNumber tag
		foreach (TiffFrame frame in frames)
		{
			TiffDataType pageNumber = frame.FrameOptions.GetTagByType(TiffTags.PageNumber);
			if (pageNumber == null)
			{
				continue;
			}
			int[] pageNumbers = (int[]) pageNumber.Value;
			frame.Save("page_" + pageNumbers[0] + ".jpg", new JpegOptions());
		}
	}
	else
	{
		// this code will export all pages really stored in TIFF
		int i = 0;
		foreach (TiffFrame frame in frames)
		{
			frame.Save("page_" + i + ".jpg", new JpegOptions());
			i++;
		}
	}
}
Console.WriteLine("pagesCount = {0}", pagesCount);
Console.WriteLine("frameLength = {0}", frameLength);
Console.WriteLine("scanPageCount = {0}", scanPageCount);
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