Black magic !
Stunned Philippe
Le 25 sept. 2014 à 21:13, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> a écrit
:
> 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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