Get an individual pagesize from a multipage tiff

Questions, comments and suggestions concerning VintaSoft Imaging .NET SDK.

Moderator: Alex

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philip.y
Posts: 12
Joined: Tue May 31, 2011 11:09 pm

Get an individual pagesize from a multipage tiff

Post by philip.y » Wed Oct 28, 2015 7:54 pm

Hi

Is it possible to obtain the page size (in bytes) of individual pages in a tiff file?

I'm wanting to determine the collective size of all colour pages within a tiff, ignoring non-colour so was looking to do something like:

Code: Select all

Using tif As New Vintasoft.Imaging.Codecs.Tiff.TiffFile(sourceFile)
                For Each page In tif.Pages
                    If (page.BitsPerPixel) >= 24 Then
                        lColourSize = lColourSize + page.Length
                    End If
                Next
            End Using
"page.length" always returns zero. Is there a way to do this without copying the page out?

Cheers

Phil

Alex
Site Admin
Posts: 1474
Joined: Thu Jul 10, 2008 2:21 pm

Re: Get an individual pagesize from a multipage tiff

Post by Alex » Sat Oct 31, 2015 5:20 pm

Hi Phil,

Length, in bytes, of TIFF image data can be calcuated from TIFF image metadata.

Here is an example that shows how to get length, in bytes, of TIFF image data:

Code: Select all

using System;
using Vintasoft.Imaging.Codecs.ImageFiles.Tiff;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(string.Format("'strips.tif', page 0, image data length in bytes: {0}", GetTiffImageDataLengthInBytes("strips.tif", 0)));
            Console.WriteLine(string.Format("'tiles.tif', page 0, image data length in bytes: {0}", GetTiffImageDataLengthInBytes("tiles.tif", 0)));

            Console.WriteLine("Press any key...");
            Console.ReadKey();
        }

        /// <summary>
        /// Gets the length, in bytes, of TIFF image data.
        /// </summary>
        /// <param name="filename">Name of TIFF file.</param>
        /// <param name="pageIndex">Zero-based index of page in TIFF file.</param>
        /// <returns></returns>
        static uint GetTiffImageDataLengthInBytes(string filename, int pageIndex)
        {
            // length, in bytes, of image data
            uint imageDataLengthInBytes = 0; 
            
            // open TIFF file
            using (TiffFile tiffFile = new TiffFile(filename))
            {
                // get TIFF tag collection of specified TIFF page
                TiffTagCollection tags = tiffFile.Pages[pageIndex].IFD.Tags;

                // get StripByteCounts tag
                TiffTag stripByteCountsTag = tags.Find(TiffTagId.StripByteCounts);
                // if tag is found image data are stored in strips
                if (stripByteCountsTag != null)
                {
                    object stripByteCountsTagData = stripByteCountsTag.Data;
                    uint[] stripByteCountTagAsUIntArray = stripByteCountsTagData as uint[];
                    if (stripByteCountTagAsUIntArray != null)
                    {
                        for (int i = 0; i < stripByteCountTagAsUIntArray.Length; i++)
                            imageDataLengthInBytes = stripByteCountTagAsUIntArray[i];
                    }
                }

                // get TileByteCounts tag
                TiffTag tileByteCountsTag = tags.Find(TiffTagId.TileByteCounts);
                // if tag is found image data are stored in tiles
                if (tileByteCountsTag != null)
                {
                    object tileByteCountsTagData = tileByteCountsTag.Data;
                    uint[] tileByteCountsTagAsUIntArray = tileByteCountsTagData as uint[];
                    if (tileByteCountsTagAsUIntArray != null)
                    {
                        for (int i = 0; i < tileByteCountsTagAsUIntArray.Length; i++)
                            imageDataLengthInBytes = tileByteCountsTagAsUIntArray[i];
                    }
                }
            }

            return imageDataLengthInBytes;
        }
    }
}
Best regards, Alexander

philip.y
Posts: 12
Joined: Tue May 31, 2011 11:09 pm

Re: Get an individual pagesize from a multipage tiff

Post by philip.y » Mon Nov 02, 2015 2:48 pm

That's exactly what I needed!

Thanks (as always) for your reply.

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