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May 2017

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2017.05.11 17:35 "JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka
2017.05.11 18:15 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Kemp Watson
2017.05.11 18:32 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka
2017.05.11 18:45 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by <jcupitt@gmail.com>
2017.05.11 18:55 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Even Rouault
2017.05.11 19:37 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka
2017.05.11 20:48 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by <jcupitt@gmail.com>
2017.05.22 11:53 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka
2017.05.22 13:13 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by <jcupitt@gmail.com>
2017.05.22 13:39 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Bob Friesenhahn
2017.05.22 16:41 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka
2017.05.22 15:31 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Kemp Watson
2017.05.22 16:42 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka
2017.05.22 19:18 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Roger Leigh
2017.05.22 19:42 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by Yakov Galka

2017.05.11 18:45 "Re: JPEG compressed RGB tiled TIFF with chroma subsampling", by <jcupitt@gmail.com>

Hi, this took me a while to work out too.

Just set TIFFTAG_JPEGCOLORMODE to JPEGCOLORMODE_RGB. This is a
pseudo-tag -- it means you are going to supply RGB data, but that the
encoder is free to convert to YCBCR and subsample in the usual way.

You need to set it on decompress too I think to make libjpg convert
the YCBCR back to RGB for you.

John