Re: Re Gamma, dithering and device calibration
Re: Re Gamma, dithering and device calibration
- Subject: Re: Re Gamma, dithering and device calibration
- From: Thomas Schierle <email@hidden>
- Date: Sun, 04 Aug 2002 17:44:12 +0200
On 2002-08-03 22:20 +0200, michael shaffer wrote:
>
Bruce writes ...
>
>
>
> If your display is truly set to gamma 2.2, then the brightness of the
>
> "squinty" dithered pattern should look the same as a solid patch of pixel
>
> value 186. (In gamma 2.2, a pixel value of 186 has half as much
>
> *energy* as a pixel value of 255.)
>
>
It would therefore be interesting if someone responded with the answer as
>
to why then does resampling such a pattern yield the numeric average (128)
>
rather than the value predicted by the gamma space (186)??? (PS v.6.02)
>
Physics ... for single white pixel, the monitors electron ray won't reach
full intensity, therefore the dithered pattern is displayed *much* too dark.
Working in Photoshop 6.01 Adobe RGB, for me a horizontal line pattern
0,0,0 / 256,256,256 equals a solid patch 186,186,186 pretty good -- whereas
a dithered pattern roughly equals 128,128,128 and btw sports a heavy
green/blue color cast.
--
Thomas Schierle, Munich, Germany
PGP key [DSS/DH] 0xA23CDA1D available at various public key servers
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