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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Tue Apr 01, 2008 2:23 am Post subject: |
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| AFryia wrote: | | I don't know. Chris Wiggles says 2.5, others say 2.22. all I know for sure is my PJ looks a hell of a lot better now at ~2.2 then it did at 1.9. I was getting readings in the 2.35-2.38 range I'll need to make another custom color and try and get 2.5 |
So which way is more gamma? Bigger numbers I'm assuming?
| Quote: | Delta E is the deviation from the target color. In this case grey scale. The smaller the number the better.
A color shift less than 3 is considered undetectable I believe. |
Perfect! Thanks for the info!
Kal
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My basement/HT/bar/brewery build 2.0
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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Tue Apr 01, 2008 1:26 pm Post subject: |
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YOur low end looks like it could use some more tweaking.
The lower the gamma the brighter more washed out the picture will appear. It's hard to say which gamma is correct, some say 2.22 others say 2.5 and again others say in between 2.2 and 2.5 is good.
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Thanks
Walter
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Tue Apr 01, 2008 10:47 pm Post subject: |
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| kal wrote: | [
So which way is more gamma? Bigger numbers I'm assuming?
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I have a 50/50 chance of being right!
In layman's terms the bigger the number is more gamma. Technically I could be wrong. All I know is more was better.
I was reading a post over at the other place and my head was spinning as people argued about inverse transforms, logarithmic values and yes 2.2 vs. 2.5 gamma.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Tue Apr 01, 2008 10:58 pm Post subject: |
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Bigger gamma numbers mean darker shadow details. Boards that give a "gamma boost" (brightening low-end shadow detail) are actually effectively producing a LOWER gamma number.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Tue Apr 01, 2008 11:42 pm Post subject: |
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| garyfritz wrote: | | Bigger gamma numbers mean darker shadow details. Boards that give a "gamma boost" (brightening low-end shadow detail) are actually effectively producing a LOWER gamma number. |
Thanks. That's what I thought.... just wanted to confirm. Something in my head made me think it was backwards from what seemed to make sense. 
Kal
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Wed Apr 02, 2008 1:29 am Post subject: |
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Gamma is an exponent, where basically output = input^gamma. Input is 0.0 - 1.0. So full input is 1.0 at any gamma, and higher values of gamma result in the output dropping off faster as you go down from 100IRE. See the attached pic for an example of several values of gamma. You can see that e.g. 2.25 and 2.5 are very similar, but they do have some definite differences -- especially in the low-IRE areas.
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kal
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Location: Ottawa, Canada
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