On 5/14/2016 6:49 PM, Stanley Halpin wrote:
On May 14, 2016, at 5:40 PM, Godfrey DiGiorgi <[email protected]> wrote:
On some cameras, lens corrections are embedded in the raw files and
automatically applied by raw converters that honor the lens correction
metadata. Not all raw converters allow you to disable the lens corrections. Nor
should you, because such cameras and lenses are designed to be used with lens
correction as part of the total imaging system and won't perform as well
without it.
Noise reduction in-camera usually means two things:
- "Long exposure noise reduction" is most typically dark frame subtraction
where beyond a certain exposure length the camera makes the exposure, then immediately
collects noise data from the sensor without opening the shutter in a similar length
exposure in order to model the noise alone. It uses that to subtract out the noise in the
captured image.
- "Noise filtering" is normally a post-capture process applied to the RGB/JPEG
rendering process. It operates much as noise reduction processing does in various image
processing apps in post.
On many cameras, filtering can be adjusted for strength and both can be turned
off entirely. On others, there are no such options.
When I have the option, I usually leave long exposure noise reduction on but
turn off noise filtering. Long exposure noise reduction can be a serious pain
when you're working with very long exposures, however.
G
On May 14, 2016, at 2:11 PM, Paul Stenquist <[email protected]> wrote:
I think you have it right. I don't know if I turned those corrections off, but I figure
since I shoot RAW it doesn't matter. I think noise reduction affects RAW but not sure. I
leave it on "auto." I think the Pentax engineers are smarter than me.
—
With respect to lens corrections, I have assumed that Pentax supplies Adobe and
others with information about their lenses. Which is why I am able to do
post-processing with a lens-correction option in LR. If this is the case, then
it seems that my computer rather than the camera is the place for these
corrections to be applied to captured files…
stan
If I understand what Godfrey was saying, the camera doesn't apply the
lens correction, it adds the information needed to do it to meta-data in
the RAW file and the computer (raw convertor) does make the correction.
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