Question

Is it possible to disable ‘Chroma Subsampling’ during resampling or resizing a JPG image?

Disabling Chroma Subsampling is same as YCbCr filter 4x4x4 as far as I understand.

Is there a library for .NET which I can use to do it?

Thanks for reading friends.

Answer 1

I don’t know of a way to do it natively but there are libraries out there such as FreeImage that have options to change the subsampling.

EDIT

Here’s a sample with OR’d together flags:

    Using I = New FreeImageAPI.FreeImageBitmap("c:\input.jpg")
        I.Save("c:\output.jpg", FreeImageAPI.FREE_IMAGE_FORMAT.FIF_JPEG, FreeImageAPI.FREE_IMAGE_SAVE_FLAGS.JPEG_SUBSAMPLING_444 Or FreeImageAPI.FREE_IMAGE_SAVE_FLAGS.JPEG_QUALITYSUPERB)
    End Using