Add BigTiff decoder tests

5 years ago · ae577bba87
15 changed files with 353 additions and 20 deletions
--- a/tests/ImageSharp.Tests/Formats/Tiff/BigTiffDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/BigTiffDecoderTests.cs
@ -0,0 +1,35 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+// ReSharper disable InconsistentNaming
+using System;
+using SixLabors.ImageSharp.PixelFormats;
+
+using Xunit;
+
+using static SixLabors.ImageSharp.Tests.TestImages.BigTiff;
+
+namespace SixLabors.ImageSharp.Tests.Formats.Tiff
+{
+    [Collection("RunSerial")]
+    [Trait("Format", "Tiff")]
+    [Trait("Format", "BigTiff")]
+    public class BigTiffDecoderTests : TiffDecoderBaseTester
+    {
+        [Theory]
+        [WithFile(BigTIFF, PixelTypes.Rgba32)]
+        [WithFile(BigTIFFLong, PixelTypes.Rgba32)]
+        [WithFile(BigTIFFLong8, PixelTypes.Rgba32)]
+        [WithFile(BigTIFFMotorola, PixelTypes.Rgba32)]
+        [WithFile(BigTIFFMotorolaLongStrips, PixelTypes.Rgba32)]
+        [WithFile(BigTIFFSubIFD4, PixelTypes.Rgba32)]
+        [WithFile(BigTIFFSubIFD8, PixelTypes.Rgba32)]
+        public void TiffDecoder_CanDecode<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
+
+        [Theory]
+        [WithFile(BigTIFFLong8Tiles, PixelTypes.Rgba32)]
+        public void ThrowsNotSupported<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel> => Assert.Throws<NotSupportedException>(() => provider.GetImage(TiffDecoder));
+    }
+}
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderBaseTester.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderBaseTester.cs
@ -0,0 +1,32 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+// ReSharper disable InconsistentNaming
+using SixLabors.ImageSharp.Formats;
+using SixLabors.ImageSharp.Formats.Tiff;
+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
+using SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs;
+
+using Xunit;
+
+namespace SixLabors.ImageSharp.Tests.Formats.Tiff
+{
+    public abstract class TiffDecoderBaseTester
+    {
+        protected static TiffDecoder TiffDecoder => new TiffDecoder();
+
+        protected static MagickReferenceDecoder ReferenceDecoder => new MagickReferenceDecoder();
+
+        protected static void TestTiffDecoder<TPixel>(TestImageProvider<TPixel> provider, IImageDecoder referenceDecoder = null, bool useExactComparer = true, float compareTolerance = 0.001f)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            using Image<TPixel> image = provider.GetImage(TiffDecoder);
+            image.DebugSave(provider);
+            image.CompareToOriginal(
+                provider,
+                useExactComparer ? ImageComparer.Exact : ImageComparer.Tolerant(compareTolerance),
+                referenceDecoder ?? ReferenceDecoder);
+        }
+    }
+}
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
@ -4,12 +4,9 @@
 // ReSharper disable InconsistentNaming
 using System;
 using System.IO;
-using SixLabors.ImageSharp.Formats;
-using SixLabors.ImageSharp.Formats.Tiff;
 using SixLabors.ImageSharp.Metadata;
 using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
-using SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs;

 using Xunit;

@ -19,20 +16,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
 {
    [Collection("RunSerial")]
    [Trait("Format", "Tiff")]
-    public class TiffDecoderTests
+    public class TiffDecoderTests : TiffDecoderBaseTester
    {
        public static readonly string[] MultiframeTestImages = Multiframes;

-        private static TiffDecoder TiffDecoder => new TiffDecoder();
-
-        private static MagickReferenceDecoder ReferenceDecoder => new MagickReferenceDecoder();
-
        [Theory]
        [WithFile(RgbUncompressedTiled, PixelTypes.Rgba32)]
        [WithFile(MultiframeDifferentSize, PixelTypes.Rgba32)]
        [WithFile(MultiframeDifferentVariants, PixelTypes.Rgba32)]
        public void ThrowsNotSupported<TPixel>(TestImageProvider<TPixel> provider)
-        where TPixel : unmanaged, IPixel<TPixel> => Assert.Throws<NotSupportedException>(() => provider.GetImage(TiffDecoder));
+            where TPixel : unmanaged, IPixel<TPixel> => Assert.Throws<NotSupportedException>(() => provider.GetImage(TiffDecoder));

        [Theory]
        [InlineData(RgbUncompressed, 24, 256, 256, 300, 300, PixelResolutionUnit.PixelsPerInch)]
@ -397,16 +390,5 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
            image.DebugSaveMultiFrame(provider);
            image.CompareToOriginalMultiFrame(provider, ImageComparer.Exact, ReferenceDecoder);
        }
-
-        private static void TestTiffDecoder<TPixel>(TestImageProvider<TPixel> provider, IImageDecoder referenceDecoder = null, bool useExactComparer = true, float compareTolerance = 0.001f)
-            where TPixel : unmanaged, IPixel<TPixel>
-        {
-            using Image<TPixel> image = provider.GetImage(TiffDecoder);
-            image.DebugSave(provider);
-            image.CompareToOriginal(
-                provider,
-                useExactComparer ? ImageComparer.Exact : ImageComparer.Tolerant(compareTolerance),
-                referenceDecoder ?? ReferenceDecoder);
-        }
    }
 }
--- a/tests/ImageSharp.Tests/TestImages.cs
+++ b/tests/ImageSharp.Tests/TestImages.cs
@ -672,5 +672,20 @@ namespace SixLabors.ImageSharp.Tests

            public static readonly string[] Metadata = { SampleMetadata };
        }
+
+        public static class BigTiff
+        {
+            public const string BasePath = "Tiff/BigTiff/";
+
+            public const string BigTIFF = BasePath + "BigTIFF.tif";
+            public const string BigTIFFLong = BasePath + "BigTIFFLong.tif";
+            public const string BigTIFFLong8 = BasePath + "BigTIFFLong8.tif";
+            public const string BigTIFFLong8Tiles = BasePath + "BigTIFFLong8Tiles.tif";
+            public const string BigTIFFMotorola = BasePath + "BigTIFFMotorola.tif";
+            public const string BigTIFFMotorolaLongStrips = BasePath + "BigTIFFMotorolaLongStrips.tif";
+
+            public const string BigTIFFSubIFD4 = BasePath + "BigTIFFSubIFD4.tif";
+            public const string BigTIFFSubIFD8 = BasePath + "BigTIFFSubIFD8.tif";
+        }
    }
 }
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFF.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFF.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ddb202145a9bce7670cc372ee578de5a53cd52cc8d5ae8a9ebdc9f9c4f4a7e81
+size 12480
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFLong.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFLong.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:90178643a159ec50335e9314836df924233debeb100763af0f77cd1be3cf58ab
+size 12480
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFLong8.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFLong8.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b38e61ccb01e10e26fb10c335fc6fca9ad087b0fb0df833e54bb02d1246e20d5
+size 12480
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFLong8Tiles.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFLong8Tiles.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a2d92b0c430cefc390f13961e00950ee7246b013335594dd249ba823eb3c3fdb
+size 12564
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFMotorola.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFMotorola.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ace8a27dbed9f918993615e545a12310b84ad94bc6af8e256258e69731f1c7ce
+size 12480
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFMotorolaLongStrips.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFMotorolaLongStrips.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2c5ebdc3774955d3b47644f57bd023e764a93ca2271118152ae920b34c1784bb
+size 12480
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFSamples.html
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFSamples.html
@ -0,0 +1,239 @@
+<html>
+  <head>
+  </head>
+  <body>
+    <p>
+      These images were created by <a href="http://www.awaresystems.be/">AWare Systems</a>.
+    </p>
+    <h1>Index</h1>
+    <p>
+      <a href="#classic">Classic.tif</a><br>
+      <a href="#bigtiff">BigTIFF.tif</a><br>
+      <a href="#bigtiffmotorola">BigTIFFMotorola.tif</a><br>
+      <a href="#bigtifflong">BigTIFFLong.tif</a><br>
+      <a href="#bigtifflong8">BigTIFFLong8.tif</a><br>
+      <a href="#bigtiffmotorolalongstrips">BigTIFFMotorolaLongStrips.tif</a><br>
+      <a href="#bigtifflong8tiles">BigTIFFLong8Tiles.tif</a><br>
+      <a href="#bigtiffsubifd4">BigTIFFSubIFD4.tif</a><br>
+      <a href="#bigtiffsubifd8">BigTIFFSubIFD8.tif</a><br>
+    </p>
+    <h1 id="classic">Classic.tif</h1>
+    <p>
+      Classic.tif is a basic Classic TIFF file. All files in this package have the same actual image content,
+      so this TIFF file serves as a reference.
+    </p>
+    <p>
+      Format: Classic TIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 12302<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+    </p>
+    <h1 id="bigtiff">BigTIFF.tif</h1>
+    <p>
+      BigTIFF.tif ressembles Classic.tif as close as possible. Except that it's a BigTIFF, that is...
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 12304<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 16<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+    </p>
+    <h1 id="bigtiffmotorola">BigTIFFMotorola.tif</h1>
+    <p>
+      BigTIFFMotorola.tif reverses the byte order.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Motorola<br>
+      Ifd Offset: 12304<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 16<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+    </p>
+    <h1 id="bigtifflong">BigTIFFLong.tif</h1>
+    <p>
+      All previous TIFFs specify DataType Short for StripOffsets and StripByteCounts tags. This BigTIFF instead specifies DataType Long, for these tags.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 12304<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Long): 16<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Long): 12288<br>
+    </p>
+    <h1 id="bigtifflong8">BigTIFFLong8.tif</h1>
+    <p>
+      This next one specifies DataType Long8, for StripOffsets and StripByteCounts tags.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 12304<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Long8): 16<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Long8): 12288<br>
+    </p>
+    <h1 id="bigtiffmotorolalongstrips">BigTIFFMotorolaLongStrips.tif</h1>
+    <p>
+      This BigTIFF has Motorola byte order, plus, it's divided over two strips. StripOffsets and StripByteCounts tags have DataType Long, so their actual value fits inside the IFD.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Motorola<br>
+      Ifd Offset: 12304<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (2  Long): 16, 6160<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (2  Long): 6144, 6144<br>
+    </p>
+    <h1 id="bigtifflong8tiles">BigTIFFLong8Tiles.tif</h1>
+    <p>
+      BigTIFFLong8Tiles.tif is a tiled BigTIFF. TileOffsets and TileByteCounts tags specify DataType Long8.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 12368<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;TileWidth (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;TileLength (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;TileOffsets (4  Long8): 16, 3088, 6160, 9232<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;TileByteCounts (4  Long8): 3072, 3072, 3072, 3072<br>
+    </p>
+    <h1 id="bigtiffsubifd4">BigTIFFSubIFD4.tif</h1>
+    <p>
+      This BigTIFF contains two pages, the second page showing almost the same image content as the first, except that the black square is white, and text color is black.
+      Both pages point to a downsample SubIFD, using SubIFDs DataType TIFF_IFD.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 15572<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 3284<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SubIFDs (1  IFD): 3088<br>
+      SubIfd Offset: 3088<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;NewSubFileType (1  Long): 1<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 16<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 3072<br>
+      Ifd Offset: 31324<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 19036<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SubIFDs (1  IFD): 18840<br>
+      SubIfd Offset: 18840<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;NewSubFileType (1  Long): 1<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 15768<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 3072<br>
+    </p>
+    <h1 id="bigtiffsubifd8">BigTIFFSubIFD8.tif</h1>
+    <p>
+      BigTIFFSubIFD4.tif is very much the same as BigTIFFSubIFD4.tif, except that the new DataType TIFF_IFD8 is used for the SubIFDs tag.
+    </p>
+    <p>
+      Format: BigTIFF<br>
+      Byte Order: Intel<br>
+      Ifd Offset: 15572<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 3284<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SubIFDs (1  IFD8): 3088<br>
+      SubIfd Offset: 3088<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;NewSubFileType (1  Long): 1<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 16<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 3072<br>
+      Ifd Offset: 31324<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 19036<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 64<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 12288<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SubIFDs (1  IFD8): 18840<br>
+      SubIfd Offset: 18840<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;NewSubFileType (1  Long): 1<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageWidth (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;ImageLength (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;BitsPerSample (3  Short): 8, 8, 8<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;PhotometricInterpretation (1  Short): RGB<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripOffsets (1  Short): 15768<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;SamplesPerPixel (1  Short): 3<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;RowsPerStrip (1  Short): 32<br>
+      &nbsp;&nbsp;&nbsp;&nbsp;StripByteCounts (1  Short): 3072<br>
+    </p>
+  </body>
+</html>
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFSubIFD4.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFSubIFD4.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:85c8da46abc2284f0ddac10bd03a7c98ee51024840b7e43f41f1c6a09bc02e7e
+size 31520
--- a/tests/Images/Input/Tiff/BigTiff/BigTIFFSubIFD8.tif
+++ b/tests/Images/Input/Tiff/BigTiff/BigTIFFSubIFD8.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:93e5ac30f507bec7936746ad6e109631c09f9b2332081e986063219ad2452a4a
+size 31520
--- a/tests/Images/Input/Tiff/BigTiff/Classic.tif
+++ b/tests/Images/Input/Tiff/BigTiff/Classic.tif
@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cfa7fcf6927be5de644beb238067479e8d834d0cbe2257b00302f5dde84a1c1a
+size 12404
--- a/tests/Images/Input/Tiff/BigTiff/readme.md
+++ b/tests/Images/Input/Tiff/BigTiff/readme.md
@ -0,0 +1,3 @@
+BigTIFF samples.  
+
+Downloaded from AWARE SYSTEMS: https://www.awaresystems.be/imaging/tiff/bigtiff.html