Always use RgbJpegSpectralConverter for decompressed jpeg data

src/ImageSharp/Formats/Tiff/Compression/Decompressors/JpegTiffCompression.cs

@@ -73,8 +73,9 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Compression.Decompressors
                     case TiffPhotometricInterpretation.YCbCr:
                     case TiffPhotometricInterpretation.Rgb:
                     {
-                        using SpectralConverter<Rgb24> spectralConverter = this.photometricInterpretation == TiffPhotometricInterpretation.YCbCr ?
-                            new RgbJpegSpectralConverter<Rgb24>(this.configuration) : new SpectralConverter<Rgb24>(this.configuration);
+                        // The jpeg data should treated as RGB color space. If the PhotometricInterpretation is YCbCr,
+                        // the conversion to RGB will be handled in the next step by the YCbCr color decoder.
+                        using SpectralConverter<Rgb24> spectralConverter = new RgbJpegSpectralConverter<Rgb24>(this.configuration);
                         var scanDecoder = new HuffmanScanDecoder(stream, spectralConverter, CancellationToken.None);
                         jpegDecoder.LoadTables(this.jpegTables, scanDecoder);
                         jpegDecoder.ParseStream(stream, spectralConverter, CancellationToken.None);

src/ImageSharp/Formats/Tiff/Compression/Decompressors/RgbJpegSpectralConverter.cs

@@ -8,8 +8,9 @@ using SixLabors.ImageSharp.PixelFormats;
 namespace SixLabors.ImageSharp.Formats.Tiff.Compression.Decompressors
 {
     /// <summary>
-    /// Spectral converter for YCbCr TIFF's which use the JPEG compression.
-    /// The jpeg data should be always treated as RGB color space.
+    /// Spectral converter for TIFF's which use the JPEG compression.
+    /// The compressed jpeg data should be always treated as RGB color space.
+    /// If PhotometricInterpretation indicates the data is YCbCr, the color decoder will handle the conversion.
     /// </summary>
     /// <typeparam name="TPixel">The type of the pixel.</typeparam>
     internal sealed class RgbJpegSpectralConverter<TPixel> : SpectralConverter<TPixel>