[argyllcms] dispcal & BT.1886
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 01 Aug 2012 11:04:05 +1000
BT.1886 is an ITU-R standard EOTF (Electro-Optical Transfer Function)
<http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.1886-0-201103-I!!PDF-E.pdf>
for flat panel displays used in HDTV studio production, and is
therefore of interest to those setting up displays used for
displaying Video and Film. It is one of the first standards
to acknowledge that real displays can't display a perfect black,
and complements the ITU-R BT.709 standard for signal encoding (ie. camera's).
BT.1886 allows for a non-zero display black as an input offset,
thereby maintaining dark contrast. This can be achieved with
"dispcal -f0". BT.1886 then has a simple exponent shape with a value
of 2.40. This can be achieved with "dispcal -G 2.4".
So in summary, dispcal has been supporting the BT.1886 EOTF for
many years before it was invented :-)
Graeme Gill.
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