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Old July 21st, 2011, 08:44 PM
Russ Russ is offline
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Lets compare contrast values

Lets compare contrast values

I have NO idea where to place this thread, so I'll place it here where it will generally be seen by the most eyes. I'll rationalize that its germaine to viewing and critiquing the brightness and/or contrast levels on viewed images. I've posted this before elsewhere but it gives an interesting perspective .

I've long suspected that what one of us views as dark is another's just right, or vice versa. I've tried to think of ways to somehow equalize what one of us sees vs another but that's preposterous. But perhaps we can all agree on a relative standard, ie how high is high or, in this case, when is detail in blacks (or shadows) or whites (or highlights) discernable.

I've created two test strips, each merely a row of integers from 0 to 9 and then repeated, below which there is a row denoting 10's. In combination, if you the first discernable number coming out of the whitest or blackest areas is a 7 between the 10 and the 20, then its 17.

The strips, one a white to light gray gradient and the other a black to dark gray gradient, should tell us whether our screens and/or eyesight is the same or different than others.

Note: there is NO point in faking it or getting a "better" score, its pointless. All this may do is tell us whether what I state as "too dark" is because of a difference in our respective monitor settings or eyesight OR a difference in our own perception of what constitutes too dark (or bright).

In each case, what is the 1st number (reading left to right and adding the 10's below) that you can clearly, completely discern (without guessing or fudging) from the background?




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Last edited by Russ; July 21st, 2011 at 08:50 PM.
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Old July 21st, 2011, 08:49 PM
Russ Russ is offline
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Re: Lets compare contrast values

While I can make out numbers partially at lower/higher values, I can truly see ALL of black background 10 and white 22 on my Viewsonic 17" CRT. Note that room lighting can have an impact on where the dropoff is. Try it with and without daylight and/or artificial lighting.
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Old July 24th, 2011, 12:38 AM
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Re: Lets compare contrast values

I'm on a Dell 2410 monitor calibrated with the Spyder2, Russ, just for baselining.

I can just start making out a 6 on the dark scale, and I start too lose detail between 23 and 24. If I move around a bit, I can barely discern to 26.

Right now, it's dark, except for the monitor. My back is to a window, though, and I'd bet during the day the band would be significantly narrower.
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Old July 24th, 2011, 12:50 AM
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Re: Lets compare contrast values

On my Acer laptop spyder 2 calibrated.

26 on the white scale
12 on the dark scale.
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Old July 24th, 2011, 05:47 AM
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Re: Lets compare contrast values

Twenty three on the white, and 16 on the dark, but only just.pith
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Old July 24th, 2011, 06:44 AM
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Re: Lets compare contrast values

23 on the white
7 on the black
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Old July 25th, 2011, 08:34 PM
G D Hickey G D Hickey is offline
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Re: Lets compare contrast values

23 on the white......4 on the black......on my 17.3" laptop. It's all I use anymore,desktop retired.
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Old July 26th, 2011, 11:02 AM
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Re: Lets compare contrast values

In daylight: 27" imac
white: 27 clearly, 28 and 29 are blobs
black: 9 clearly, 8 is a blob.
I'll try again in the dark.
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Old July 26th, 2011, 12:00 PM
Russ Russ is offline
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Re: Lets compare contrast values

Allowing for the probability that what one of us terms "well defined" vs another person accounts for some differences in our respective findings, the more probable condition is that some monitors are displaying a wider range of contrast than others, ie the range from the discernable blacks against black to whites against white. I would interpret anyone who has a lower reading on BOTH ends (or higher on both) simply needs to adjust their brightness/contrast controls to "center" their monitor.

For people with a shorter contrast range, I'd imagine the problem is that images tweaked on a wider range monitor are inevitably going to show up with blocked up shadows and blown highlights. Conversely, I'd assume that images tweaked on a shorter range monitor will appear "muddy", ie flat, lacking crisp blacks and whites.
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Old July 26th, 2011, 01:07 PM
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Re: Lets compare contrast values

I have no idea what this thread is about, but it looks like fun.
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