On 8/2/22 01:53, John Fine wrote:
On Mon, Aug 1, 2022 at 8:36 PM 'dkloi' via hugin and other free
panoramic software <[email protected]
<mailto:[email protected]>> wrote:
A7m3 does uncompressed 14 bit raw files
https://helpguide.sony.net/ilc/1720/v1/en/contents/TP0001661967.html
<https://helpguide.sony.net/ilc/1720/v1/en/contents/TP0001661967.html>
https://www.sony.co.uk/electronics/support/articles/00229990
<https://www.sony.co.uk/electronics/support/articles/00229990>.
Thanks! I remember long ago seeing that in the documentation and being
annoyed that it wasn't in the camera menu system and concluding it was
about some different model.
But I checked again and it is right there where it is supposed to be.
Somehow I have been failing to notice it all this time.
I quickly took a picture that needs more range than jpg has. Simply
viewing the arw with the microsoft viewer shows just as much noise in
the dark areas as I'm used to. But converting arw to tiff with
rawtherapee gave me much better results than I'm used to. The result
still has more noise than the JPG but only a little bit more. So the
compression seems to be destroying information needed for noise
reduction, and I've been using raw incorrectly all this time.
I've been using RAW ever since I first got my old (no longer working)
Maxxum 7D. I saw advice (I think on this list) saying that the best
quality results came from starting with RAW, sticking with
high-dynamic-range color (16-bit per channel) for all processing, and
only produce a final JPG *when you're done*.
In other words, don't throw away any image information until you no
longer need it - when it's going out the door.
I've occasionally made an "HDR" image from JPGs, but histograms showed
spikes in each chennel, because JPG is missing 8 bits of image data per
channel.
I think it's also best to archive the source RAW files (they're like
negatives from the days of film) and your processing tool's settings
(PP3 files for Rawtherapee) in case I want to go back and rework them.
Perhaps I've learned better how to deal with noise, or adjust
color/contrast/etc since I processed it previously.
Thanks for the links for the online guides, learned a lot more about the
A7R IVA than I might have otherwise. I still want one. :)
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