Moose is probably asleep so I'll answer. You can find LCE (Local
Contrast Enhancement) described on Luminous Landscape here:
<http://www.luminous-landscape.com/tutorials/contrast-enhancement.shtml>
It's done using unsharp mask with unlikely parameters for typical
unsharp masking: Amount — 20%, Radius — 50, Threshold — 0
But the description here (while not invented by him) actually originates
from Thomas Knoll who is the chief author of PhotoShop and ACR so it is
not unusual to find that it is now in ACR as well. There it is known as
the "clarity" slider. But my view of its effect in ACR is that it's
much subdued there relative to using the parameters above. Moose uses
LCE on a separate layer so that he can control the strength of the
effect with the layer's opacity control.
According to Bruce Fraser and Jeff Schewe writing in "Real World Camera
Raw with Adobe PhotoShop CS3" the clarity slider's effect can be
simulated in PhotoShop by using unsharp mask on a separate layer with
parameters: Amount — 15%, Radius — 100
"Then in the layer's Blend If option (double-click the layer icon),
select This Layer and split the highlight and shadows sliders to set the
blend range so that shadows blend from 0/100 and the highlights blend
from 127-255."
Chuck Norcutt
Michael Wong wrote:
> Moose,
> Thanks for your comment.
>
> What is LCE? Is it included in PS?
>
> Thanks.
>
>
> ---
> Michael
>
>
>
>
> 2009/1/4 Moose <olymoose@xxxxxxxxx>
>
>> Michael Wong wrote:
>>> http://www.fotop.net/MichaelWong/Rollei35sBW
>>>
>>> Although it's not very good, the first step is successful ^_^
>>>
>> Michael Wong wrote:
>>> I missed the info from the website (
>> http://www.digitaltruth.com/devchart.html ) & it recommends 9 mins
>> developing time for Lucky 100 by TMAX developer. I made it less 2 mins,
>> maybe it caused to low contrast :-(
>> It's been something like 40 years since I developed a roll of B&W, so I
>> have no idea what the short development time would do.
>>
>> But it's only been a couple of weeks since I scanned some B&W film. It's
>> impossible to tell from here how much of the results is from
>> film/development and how much from scanner, scanning software and
>> operator settings.
>>
>> Using IMG3605 as an example, overall contrast is fine, in the sense that
>> neither highlight or shadow detail is lost at the ends of the histogram.
>> However, the image overall looks flat and lifeless, especially for a
>> subject so busy and full of life. As I see it, the problem is at least
>> partially in local contrast and sharpness, with lesser problems of tonal
>> distribution.
>>
>> Although this is a film image originally, I am seeing it as a digital
>> capture, since it was scanned. Possibly as a result of the development,
>> local contrast, tonal differentiation at the edges between areas of
>> different tonal value, is very low. Also, detail actually captured by
>> lens and film is lost in the digital process. ALL digitally captured
>> images need sharpening if one wishes to see all the detail. It's nothing
>> to do with the source or the nominal resolution of the sensor/scanner,
>> but with the nature of scanning of an analog image with a fixed grid.
>> I've tried to explain the reason in clear, simple terms on Zone-10.
>> <
>> http://zone-10.com/cmsm/index.php?option=com_content&task=view&id=149&Itemid=1&limit=1&limitstart=1
>> Here are a couple of versions of how I think the image "should" look.
>> <http://www.moosemystic.net/Gallery/Others/MWong/IMG3605.htm>
>>
>> I first applied noise reduction, mostly so that LCE and sharpening
>> wouldn't accentuate the grain. Then I applied LCE, Curves and
>> Sharpening. I also did use masks, so those tools were applied in
>> different amounts to different parts of the image.
>>
>> It may well be that the right film/developer combination will get you
>> negs that will print perfectly with the right paper and darkroom
>> technique. You will still need LCE and/or sharpening to get a similar
>> effect on the web for scanned images.
>>
>> All the above assumes a desire for the kind of result I linked to. There
>> may well be others for whom the soft, almost dreamy quality af the image
>> as-is will be preferable.
>>
>> Moose
>> --
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