Correction. I do believe the histogram visible now is exactly the same
as I saw before. I was confused by the lack of gaps in the bright bits.
There are none visible in the overall luminosity histogram but they
are very visible in the individual RGB channels. That is what I recall
seeing and what I described in my first mail.
Chuck Norcutt
On 4/29/2011 8:43 PM, Chuck Norcutt wrote:
> I never saw a histogram as you show for "Top is as it came off the web".
> If I did I would never have described it as having spikes and gaps.
> The histogram that I saw looked (and still does look) similar to the
> levels manipulation in the middle. Perhaps Jim has been toying with the
> image since it still looks similar to but not quite as bad as what I
> recall seeing the first time.
>
> Yes, the bottom is what I would call smooth but even the top isn't bad.
> I just never saw that histogram before. Check the image now and
> you'll see that the top histogram doesn't match the current image. I
> recall the original as having gaps in the bright bits. Now there are
> lots of short fat spikes in the bright bits.
>
> Chuck Norcutt
>
>
> On 4/29/2011 7:24 PM, Moose wrote:
>> On 4/29/2011 8:33 AM, Chuck Norcutt wrote:
>>> I don't normally look at histograms of photos other than my own.
>>> However, this image struck me as looking not quite smooth and I didn't
>>> understand why. That's when I looked at the histogram and saw what I
>>> considered to be lots of 8-bit luminance bending due to the spikes in
>>> the shadows and holes in the bright bits.
>>
>> Perhaps it's a matter of degree. Here are three histograms from the Rhody
>> image.
>> <http://galleries.moosemystic.net/MooseFoto/index.php?gallery=Tech/Misc&image=RhodyHist.jpg>
>>
>> Top is as it came off the web. Most of us interpreted it as pretty smooth
>> overall, with some signs of extensive
>> manipulation. I assume (Yes, risky.) that you are referring to the smallish
>> spikey protrusions in the middle and spiky
>> troughs up higher?
>>
>> Middle is a simple manipulation with Levels in 8 bit. This is what I think
>> of from your description "spikes in the
>> shadows and holes in the bright bits."
>>
>> I suppose the bottom is closer to what you would call smooth, and likely not
>> altered in 8-bit?
>>
>> Moose
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|
