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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Mon May 05, 2008 6:46 pm Post subject: Cool CR Calculator |
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Check out this cool calculator:
http://home1.gte.net/res18h39/contrast.htm
For those of us with bat caves, the room reflectivity of .01 may be a bit too high. I like to put in something between .001-.005.
For those that don't know, the ANSI CR of your CRT is around:
AC - 80-100:1
LC - 120-150:1
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Tue May 06, 2008 12:14 am Post subject: |
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Not to showcase my ignorance, but what do the numbers do for you after you've got 'em?
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deronmoped
Joined: 03 Nov 2006
Posts: 1154
Location: San Diego
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| Posted: Tue May 06, 2008 4:15 pm Post subject: |
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I wonder how they figure out room reflectivity? Are they saying .01% of the light makes it back to the screen?
Deron.
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue May 06, 2008 10:13 pm Post subject: |
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| perisoft wrote: | | Not to showcase my ignorance, but what do the numbers do for you after you've got 'em? |
Well, they don't do much for you per se. You can vary the room reflectivity to see what impact that has.
It is more of an interesting analysis of ANSI CR and on/off CR and how they effect the whole range. It is interesting that a projector with very high on/off CR but bad ANSI CR (like a CRT) has a much greater contrast ratio on low APL scenes vs. a low on/off, high ANSI like a typical digital. You can sort of compare them and see where each has its "bang".
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Dave
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Wed May 07, 2008 1:28 am Post subject: |
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Gotcha. I'd like to see some ansi and on/off cr numbers for 35mm film. I suspect they're similar to crts...
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Wed May 07, 2008 5:41 pm Post subject: |
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Erik Garci came up with this about two years ago. It got a lot of play on the digital forum at AVS. Dave, this was championed by your BFF Darin.
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Wed May 07, 2008 6:10 pm Post subject: |
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| Spanky Ham wrote: | | Erik Garci came up with this about two years ago. It got a lot of play on the digital forum at AVS. Dave, this was championed by your BFF Darin. |
Ahhhhh, my buddy. Actually, I can see why he championed it. Although he has been a digi-boy for a long time, he has always been emphasizing on/off as not inferior to ANSI (as so many of the digi-boys think). This demonstrates its importance of it in low APL scenes quite well.
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Dave
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