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Photo Retouching "Improving" photos, post-production, correction, etc.

32 band grey?

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  #1  
Old 07-21-2014, 10:42 AM
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juliewood juliewood is offline
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32 band grey?

I've seen a couple references to using a 32 band grey technique which sounds very useful, but searching through the forums and tutorials I can't find an explanation. Can anyone please point me in the right direction? Thank you!
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Old 07-21-2014, 12:23 PM
skoobey skoobey is offline
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Re: 32 band grey?

What is that???

32 bit? Maybe? It's not a technique, it's an image depth.
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Old 07-21-2014, 01:19 PM
insmac insmac is offline
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Re: 32 band grey?

Never heard of it.
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Old 07-21-2014, 02:36 PM
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Tony W Tony W is offline
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Re: 32 band grey?

Any chance you could point to the references or the context of such a technique being useful?

Not a clue really and the closest I can imagine is posterisation of an image to 32 levels, but cannot imagine if that was the case what you would do with it.
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Old 07-21-2014, 02:46 PM
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Re: 32 band grey?

32bit Grayscale?
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Old 07-21-2014, 02:54 PM
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Re: 32 band grey?

32 bit HDR?
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Old 07-21-2014, 05:23 PM
skoobey skoobey is offline
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Re: 32 band grey?

Is it a bird? Is it a plane?
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Old 07-23-2014, 02:26 AM
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Re: 32 band grey?

I know of a 32 step gray card to calibrate the monitor before the days of hardware based monitor calibration.

If you are able to distinguish among the 32 levels of the gray card (image), then the brightness and contrast on your monitor are correct.

It was useful way to make sure that the monitor is setup correctly.

Back then, some photo centric sites had a gray scale band either on the top or bottom of the opening page for users to validate that their monitor was set correctly to be able to view the pictures correctly.

Sounds like 32 shades of gray
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Old 07-23-2014, 08:43 AM
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Re: 32 band grey?

Quote:
Originally Posted by Aladdin View Post
I know of a 32 step gray card to calibrate the monitor before the days of hardware based monitor calibration.
If you are able to distinguish among the 32 levels of the gray card (image), then the brightness and contrast on your monitor are correct
Not necessarily (we can go there if you want).
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Old 07-24-2014, 09:53 AM
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juliewood juliewood is offline
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Re: 32 band grey?

I will look for the original references again. It sounded like they had split the luminosity of the image out into the 32 steps of the gray card Aladdin referenced. One person mentioned a way to fix blemishes or restoration spots that involved selecting the level (channel?) they were on and lightening it until the blemishes matched the surrounding grays. The other reference was along the lines of "a retoucher's toolbox includes dodge&burn, frequency separations, noise reduction, 32 band gray, degrunge, etc." I believe both posters were Senior Member level so I thought "oh, this must be a common thing I just haven't heard of yet."

Just realized, I wonder if search knows that gray=grey. That may be why I can't find it. I will report back. Now it's a quest!
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