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12/05/2004 06:04:53 PM · #1 |
Hi Everybody,
I noticed that, when voting, at the bottom of the screen is a horizontal series of small squares ranging from pure white on the left that gradually fades to pure black on the right. What is the purpose of this? Is it a way of checking that your monitor is properly calibrated? Should I be able to discern differences between any two adjoining squares? I recently calibrated my monitor, but the three or four squares at the far right of the series all look totally black to me.
Thanks for your help. |
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12/05/2004 06:18:39 PM · #2 |
The last 3 look totally black on mine too
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12/05/2004 06:24:27 PM · #3 |
Year are supposed to be able to see differences in each square, yes.
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12/05/2004 08:22:52 PM · #4 |
you should be able to discern the difference between the last two squares (and all the others), but with the lighter background they are a bit harder to see. Here is a thread I started a few months back, "Monitor Calibration Revisted", in which I found a reason for the problem.
Note that it is not the only reason. Some monitors are not capable of being calibrated, but that didn't seem to be the case for mine since I was able to calibrate properly. However, some monitors (including mine) must compress the dynamic range of brightness in order to display all distinctly. For example, Gordon (in the above linked thread) stated he was able to see them clearly on the page, so he obviously has a monitor that is capable of seeing a larger dynamic range than mine is. In order to get my monitor to distinquish between all squares I have to compress the dynamic range quite a bit. This screenshot of the last step of a calibration shows the compressed dynamic range in the curve:
Yeah, I know -- I need a new monitor.
So, bottom line is they should be visible, but a lot of monitors are not capable of the dynamic range required for this.
David
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12/06/2004 01:28:55 PM · #5 |
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12/06/2004 03:11:31 PM · #6 |
| Same here, the 3-4 darkest squares are indistinguishable, but only when I calibrate to a gamma of 2.2. When I use my PowerBook's native gamma of just over 1.8 then I can see all the individual squares. Can somebody explain why 2.2 became the industry standard?!? |
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12/07/2004 01:04:17 AM · #7 |
Originally posted by magnus:
Same here, the 3-4 darkest squares are indistinguishable, but only when I calibrate to a gamma of 2.2. When I use my PowerBook's native gamma of just over 1.8 then I can see all the individual squares. Can somebody explain why 2.2 became the industry standard?!? |
Here is a link to the W3 article on sRGB, which includes a discussion on Gamma and why 2.2 was chosen. (sRGB)
David
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12/07/2004 01:21:18 AM · #8 |
The normal problem with not being able to see differences between the darkest squares is not the gamma setting but rather the black level.
If the monitor is not setup correctly it can go to full dark when the drive is above zero. This needs to be adjusted. At the darkest level the gamma has less effect then the black level adjustment.
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