I have read that the manufacturer's raw converters are all very
conservative... they simply give up and consider all channels blown if
one is blown. It's their competition like ACR which attempt to figure
out (apparently from the local context) what was probably there.
Chuck Norcutt
Candace Lemarr wrote:
> Hi Ken,
>
> Well, I know that you have much more knowledge about how these programs
> work than I. The only thing I can say is that there is a noticeable
> difference to my untrained eye as to how these different RAW converters
> handle highlight recovery. I have read many times that it is supposedly
> "impossible" to recover blown highlights from (to use the list
> terminology) these "E-thingies".
> However, I have recovered things I never thought possible in the past
> using ACR with CS3 and E-300, E-330, and E-510 ORFs. I was extremely
> surprised based on what I'd read. Now I have the E-30 and cannot recover
> those highlights with Master. It seems the option is to use ACR in PSE
> 8.0 and save as .DNG, and then open in CS3 to edit and convert to 8 bit
> JPEG.
>
> I have used the method you mention with JPEGs in CS3 to varying degrees
> of success.
>
> Candace
>
>
>
> Ken Norton wrote:
>> There is nothing magical to "highlight recovery". It is nothing more than
>> automated curves adjustment. If you convert to 48-bit format and apply
>> curves to that you can end up with the same result--just not as easily.
>> Highlight recovery does not actually do anything in the process of
>> converting the RAW file itself, but applies the settings to the RAW to
>> internal format after the conversion algorithm has been run.
>>
>> In nearly any converter you can just do your conversion to protect the
>> highlights (essentially underexposing the picture) and then apply a single
>> upward arching curve adjustment to bring the midtones back to proper
>> exposure. This is the poor-man's highlight recovery method.
>>
>> AG
>>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|