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Jpeg encoder writes zeroed chrominance quantization table for grayscale images and RGB encoding #1713

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@br3aker
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  • I have written a descriptive issue title
  • I have verified that I am running the latest version of ImageSharp
  • I have verified if the problem exist in both DEBUG and RELEASE mode
  • I have searched open and closed issues to ensure it has not already been reported

Description

Current implementation of the JpegEncoderCore writes Block8x8F chroma = default (i.e. zeroed) table to the DQT marker for grayscale images. While ITU spec doesn't forbid it - encoder writes proper marker length so everything works fine but it would be extra nice if there's no 01 + x64 00 bytes in the binary.

This is super unimportant so it can be marked as 'Future' without a doubt.

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