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Re: [OM] And for a change of pace - Spinning Girl

Subject: Re: [OM] And for a change of pace - Spinning Girl
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 25 Sep 2014 15:13:34 -0400
From CH's reply I have to say not all the time. But if it's bad it certainly does. If the histogram is drawn from a JPEG it will have 256 bars for each shade of each color. If the posterization is bad it will show spaces where some bars are totally missing. You can't create posterization by reducing brightness but you can easily create it by pushing shadows up too far. For example: Take 3 low brightness values: 3, 4 and 5. Push them up by 2 stops which requires multiplying by 4. The result is 12, 16 and 20. What were previously contiguous values now have gaps in between... holes in the histogram.

Chuck Norcutt


On 9/25/2014 2:55 PM, Philippe wrote:
Does posterization really show in a histogram?

Amities
Philippe, always eager to learn.

Le 25 sept. 2014 à 15:06, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> a écrit 
:

If there's posterization it's pretty minor.  If I load it into PS and view the 
histogram (even by individual color channel) there's nothing that jumps out at 
me.

And, by the way, Ken, I liked those severely punished pixels.

Chuck Norcutt


On 9/24/2014 7:20 PM, C.H.Ling wrote:
Nice! I like the color and tone. It seems to have some posterization,
don't know if this can be avoided.

C.H.Ling

----- Original Message ----- From: "Ken Norton" <ken@xxxxxxxxxxx>


Enough of the tie dye stuff. Here is an artistic shot from a photo
shoot last year that the model has finally signed off on.

Processed as a combination of Lightroom and Picasa. This is a heavily
cropped shot from the Panasonic DMC-L1. I think the lens was the
14-42.

http://zone-10.com/tope2/main.php?g2_itemId=14577

Oh, and Chuck, the pixels have been severely punished, so don't expect
to figure out the quality of the lens, sensor, yada yada.

AG

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