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  1. PO
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    <p>Here is my attempt to subclass BuilderExtension, override DecodeStream, and glue in libtiff.net.</p> <p>Here are my two test tiffs <a href="http://minus.com/lbch5irLumoSQQ" rel="nofollow">different size pages</a> &amp; <a href="http://minus.com/lboR49aXnS7tlZ" rel="nofollow">pages with different colour space</a>. I've compiled against ImageBuilder v3.2.2.</p> <p>I'm getting a fault when I use the ConsoleApplication project in the ImageResizer v3.2.2 source with the following code. I've run out of time to fix this issue at the moment, so I thought I'd put my progress here in case anyone else wants to take this further.</p> <p><strong>My test code</strong> </p> <p>I think is failing at <code>ImageResizer.ImageBuilder.PrepareDestinationBitmap()</code> on line <code>s.destBitmap = ...</code> with a <em>Parameter is not valid.</em> error. The dimensions are w=9994,h=7102 and I suspect this might be a memory issue - however if I decode the tiff using <code>DecodeTiffTo32BitBitmap()</code> first and pass that to ImageResizer as a memory stream the error does not exist. Also, this failure appears for both v3.2.2 and v3.2.3.</p> <pre><code>var Path = @"[whatever]\TiffDecoderTests\"; var c = new Config(); new TiffDecoder().Install(c); c.BuildImage(Path + "different_page_sizes.TIF", Path + "different_page_sizes-page2-TiffReader.png", "format=png&amp;page=2&amp;decoder=tiffdecoder"); </code></pre> <p><strong>My TiffDecoder class:</strong></p> <pre><code>namespace ImageResizer.Plugins.TiffDecoder { using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.Globalization; using System.IO; using System.Linq; using BitMiracle.LibTiff.Classic; using ImageResizer; using ImageResizer.Configuration; using ImageResizer.Resizing; public class TiffDecoder : BuilderExtension, IPlugin, IFileExtensionPlugin { private static readonly string[] supportedExtensions = new[] { ".tiff", ".tif", ".tff" }; public IPlugin Install(Config c) { c.Plugins.add_plugin(this); return this; } public bool Uninstall(Config c) { c.Plugins.remove_plugin(this); return true; } public IEnumerable&lt;string&gt; GetSupportedFileExtensions() { return supportedExtensions; } public override Bitmap DecodeStream(Stream s, ResizeSettings settings, string optionalPath) { var requested = "tiffdecoder".Equals(settings["decoder"], StringComparison.OrdinalIgnoreCase); if (!string.IsNullOrEmpty(settings["decoder"]) &amp;&amp; !requested) { return null; // Don't take it away from the requested decoder } // If a tiff is coming in, try first, before Bitmap tries to parse it. if (requested || (optionalPath != null &amp;&amp; supportedExtensions.Any(ext =&gt; optionalPath.EndsWith(ext, StringComparison.OrdinalIgnoreCase)))) { return this.Decode(s, settings); } return null; } public override Bitmap DecodeStreamFailed(Stream s, ResizeSettings settings, string optionalPath) { // Catch tiff files not ending in an expected extension try { return this.Decode(s, settings); } catch { return null; } } public Bitmap Decode(Stream s, ResizeSettings settings) { return DecodeTiffTo32BitBitmap(s, settings["page"]); } private static Bitmap DecodeTiffTo32BitBitmap(Stream s, string page) { s.Position = 0; using (var image = Tiff.ClientOpen(string.Empty, "r", s, new TiffStream())) { SetDirectory(image, page); // Find the width and height of the image var value = image.GetField(TiffTag.IMAGEWIDTH); var width = value[0].ToInt(); value = image.GetField(TiffTag.IMAGELENGTH); var height = value[0].ToInt(); // Read the image into the memory buffer var raster = new int[height * width]; if (!image.ReadRGBAImage(width, height, raster)) { return null; } // Caller needs to handle disposing the bitmap. var bmp = new Bitmap(width, height, PixelFormat.Format32bppRgb); var rect = new Rectangle(0, 0, bmp.Width, bmp.Height); var bmpdata = bmp.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format32bppRgb); var bits = new byte[bmpdata.Stride * bmpdata.Height]; for (var y = 0; y &lt; bmp.Height; y++) { var rasterOffset = y * bmp.Width; var bitsOffset = (bmp.Height - y - 1) * bmpdata.Stride; for (var x = 0; x &lt; bmp.Width; x++) { var rgba = raster[rasterOffset++]; bits[bitsOffset++] = (byte)((rgba &gt;&gt; 16) &amp; 0xff); bits[bitsOffset++] = (byte)((rgba &gt;&gt; 8) &amp; 0xff); bits[bitsOffset++] = (byte)(rgba &amp; 0xff); bits[bitsOffset++] = (byte)((rgba &gt;&gt; 24) &amp; 0xff); } } System.Runtime.InteropServices.Marshal.Copy(bits, 0, bmpdata.Scan0, bits.Length); bmp.UnlockBits(bmpdata); return bmp; } } /// &lt;summary&gt; /// Sets the TIFF directory to the first that matches the requested page number, otherwise: /// - If page not set OR less than 0, use the first page in the TIFF. /// - If tiff has no directories with the "PAGE" tag, use the first frame in the TIFF. /// &lt;/summary&gt; /// &lt;param name="image"&gt;The image.&lt;/param&gt; /// &lt;param name="page"&gt;The page.&lt;/param&gt; /// &lt;remarks&gt; /// From what I can tell a TIFF image can store any pages in any directory, so the 1st dir /// might not hold the 1st page - this is why we first iterate all frames looking for a PAGE tag. /// &lt;/remarks&gt; private static void SetDirectory(Tiff image, string page) { var pageIndex = GetAdjustedPage(page); var numberOfDirectories = image.NumberOfDirectories(); for (short dirNumber = 0; dirNumber &lt; numberOfDirectories; ++dirNumber) { image.SetDirectory(dirNumber); // Ignore pages that might be thumbnails var subFileType = image.GetField(TiffTag.SUBFILETYPE); if (subFileType == null || subFileType[0].ToString().ToUpper() != "PAGE") { continue; } // Stop if page found if (pageIndex == int.Parse(image.GetField(TiffTag.PAGENUMBER)[0].ToString())) { return; } } // Default to the first frame if the page wasn't found. image.SetDirectory(0); } private static int GetAdjustedPage(string page) { var pageIndex = 1; if (!string.IsNullOrEmpty(page)) { int.TryParse(page, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out pageIndex); } // So users can use 1-based numbers return Math.Max(1, pageIndex) - 1; } } } </code></pre>
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    1. POWhy does ImageResizer not handle extraction of tiff pages if the tiff has pages of differing image types?
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    1. USmeataxe
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      1. VTUpMod
    1. COFurther testing seems to indicate the `WicBuilder` plugin resolves this issue.
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    2. COI believe the error you're getting actually is caused by memory constraints; the given dimensions require 283MB of **contiguous** RAM; and even if you have gigabytes of free ram, it may be sufficiently fragmented to cause this problem. Rebooting and running the code immediately would probably work.
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      1. USLilith River
    3. COAlso, FreeImageDecoder now supports multi-page TIFF files, which should be another solution as well.
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