Add test for jpeg compressed tiff, which is actually RGB colorspace

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -640,6 +640,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
 
         [Theory]
         [WithFile(RgbJpegCompressed, PixelTypes.Rgba32)]
+        [WithFile(RgbJpegCompressed2, PixelTypes.Rgba32)]
         [WithFile(RgbWithStripsJpegCompressed, PixelTypes.Rgba32)]
         [WithFile(YCbCrJpegCompressed, PixelTypes.Rgba32)]
         [WithFile(YCbCrJpegCompressed2, PixelTypes.Rgba32)]

tests/ImageSharp.Tests/TestImages.cs

@@ -780,6 +780,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string RgbDeflatePredictor = "Tiff/rgb_deflate_predictor.tiff";
             public const string RgbDeflateMultistrip = "Tiff/rgb_deflate_multistrip.tiff";
             public const string RgbJpegCompressed = "Tiff/rgb_jpegcompression.tiff";
+            public const string RgbJpegCompressed2 = "Tiff/twain-rgb-jpeg-with-bogus-ycbcr-subsampling.tiff";
             public const string RgbWithStripsJpegCompressed = "Tiff/rgb_jpegcompressed_stripped.tiff";
             public const string RgbJpegCompressedNoJpegTable = "Tiff/rgb_jpegcompressed_nojpegtable.tiff";
             public const string RgbLzwPredictor = "Tiff/rgb_lzw_predictor.tiff";

tests/Images/Input/Tiff/twain-rgb-jpeg-with-bogus-ycbcr-subsampling.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d7a559d36e3852265ab4f82e43d28cc0bfc310813a5ced08e51c1366d8e323f9
+size 146853