Yahoo Groups archive

Digital BW, The Print

Index last updated: 2026-04-28 22:56 UTC

Message

RE: [Digital BW] difference in Gamma 1.8 and Gamma 2.2 numbers

2004-03-24 by Paul D. DeRocco

> From: Johnny Eades [mailto:jeades1@...]
> 
> There has been something I have noticed when I changed from Gray 
> Gamma 2.2 to Gray Gamma 1.8. When I have the 21 step grayscale which 
> has the density marked in percentages,and I pass the eyedropper tool 
> over the 50% square and am using GG 1.8; the number of the percentage 
> is 58% and the number relative to 0 to 255 is 148. If I reset the 
> Gray Gamma to 2.2 the numbers match the grayscale markings.I have 
> come to realize the grayscale was intended to be viewed at GG 2.2. 
> Does anyone have a grayscale that is calibrated with the numbers to 
> be viewed at GG 1.8. Even the grayscale from PiezographyBW is marked 
> like the GG 2.2 scale and Jon Cones recommends the monitor and the 
> workspace of Photoshop both be GG 1.8. Has anyone else dealt with 
> this question and resolved it to their satisfaction yet? If so please 
> share with this group. I wouldn't think I was the only one noticing 
> this anomaly.

Just assign the 1.8 profile, instead of converting to it.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@...

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.