[argyllcms] Re: colprof
- From: <graxx@xxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Sun, 2 Feb 2020 17:22:01 -0500
Gerard,
The outFile300 -> XYZ Lux + Matrix profile 'stats' are as follows :
peak err = 0.888202, avg err = 0.244000, RMS = 0.285845
This is way better than the '-as' Matrix+shaper profile stats:
peak err = 2.220396, avg err = 0.642870, RMS = 0.747308
One comment.
A quick look at the TRC tags reveals an important difference in the -ag
compared to the -as encoding.
The -ag encoding starts at 0 where the -as encoding does not. That's an
important difference.
This is the two TRCs, side by side:
https://1drv.ms/u/s!AkD78CVR1NBqkt5kI8ghbh-oLaUrag?e=UZnTch
And this is the two TRCs superimposed, in Layer -> Difference mode, in
Photoshop:
https://1drv.ms/u/s!AkD78CVR1NBqkt5lUjeEEs0z2WWdaQ?e=SLL8eO
/ Roger
From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On
Behalf Of Gerhard Fuernkranz
Sent: Sunday, February 2, 2020 4:51 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: colprof
Am 02.02.20 um 22:40 schrieb Gerhard Fuernkranz:
Am 02.02.20 um 21:41 schrieb graxx@xxxxxxxxxxxx <
mailto:graxx@xxxxxxxxxxxx>
:
[...]
-as:
peak err = 2.220396, avg err = 0.642870, RMS = 0.747308
versus -ag:
peak err = 8.525457, avg err = 2.160119, RMS = 2.613240
These numbers are already an indication, that a power function ("gamma") has
only a limited capability to describe the display's TRC accurately.
Regards,
Gerhard
Other related posts:
