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Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-01T13:58:54-07:00
by NicolasRobidoux
henriwho: Do you think that the apartments image would look better if I clipped the histogram, bringing "up" the black point and moving "down" the white point? Or manipulated the colour histogram somehow?
I believe you mentioned that my processing was somewhat lacking in contrast, and I think I agree. Given that I am not an expert at raw conversion, it could be that I processed too conservatively.
P.S. I'm thinking of bringing the black point up to about 2885.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-01T14:10:31-07:00
by NicolasRobidoux
I actually think that the white point is just fine. And black point at 2585.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-01T14:19:48-07:00
by NicolasRobidoux
henriwho: I'm just going to do it: black point up to 3035 and up the contrast from 5 (default) to 8.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-01T18:35:15-07:00
by NicolasRobidoux
I think this last one was overdoing it. Maybe it looks better, but it is less "natural".
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-01T19:41:48-07:00
by NicolasRobidoux
Henry: I decided to keep the one I had before trying to tweak.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T01:21:16-07:00
by henrywho
Actually, the color of "apartment.tif" is a bit off, kinda green-cast there. What something like:
Code: Select all
LibRaw-0.14.6\bin\dcraw_emu.exe -w +M -H 2 -fbdd 1 -dcbe -q 10 -o 1 -g 1 1 -6 apartment.rw2
ImageMagick\convert.exe apartment.rw2.ppm -set colorspace sRGB -crop 2520x2520+530+1249 +repage -define filter:filter=Jinc -define filter:window=Jinc -define filter:lobes=3 -define filter:blur=0.9891028367558475 -distort resize 840x840! -alpha off +repage -gamma 2.2 -depth 16 -quality 95% apartment_jj3.png
Actually, I am not sure whether I am using the gamma operators correctly. What does dcraw's "-o 1 -g 1 1" mean? It is linear RGB or gamma-expanded sRGB?
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T04:06:49-07:00
by NicolasRobidoux
henrywho wrote:Actually, the color of "apartment.tif" is a bit off, kinda green-cast there.
I noticed. I'll see if I can fix. (Quickly, because supercomputer runs hopefully start today.)
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T05:03:22-07:00
by NicolasRobidoux
(deleted B/C wrong)
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T06:25:49-07:00
by NicolasRobidoux
henrywho wrote:Code: Select all
LibRaw-0.14.6\bin\dcraw_emu.exe -w +M -H 2 -fbdd 1 -dcbe -q 10 -o 1 -g 1 1 -6 apartment.rw2
This command, used in linux, gives me
Code: Select all
1: No such file or directory
-dcbe: No such file or directory
-q: No such file or directory
10: No such file or directory
-o: No such file or directory
1: No such file or directory
-g: No such file or directory
1: No such file or directory
1: No such file or directory
-6: No such file or directory
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T07:48:05-07:00
by NicolasRobidoux
henriwho: Are you aware that the colour profile of the GX1 with dcraw was revised with dcraw 9.12?
P.S. Not sure that this is actually correct.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T08:11:09-07:00
by NicolasRobidoux
henriwho: I think the green tinge is gone if I use
Code: Select all
dcraw -v -w -q 1 -f -H 2 -6 -o 1 -T P1030330.RW2
The result appears OK when imported with sRGB v2 Perceptual.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T08:28:37-07:00
by NicolasRobidoux
henriwho: Yours will be the only image downsampled with Jinc Lanczos.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T08:34:45-07:00
by NicolasRobidoux
henriwho: I'm replacing the apartments.tif image with the dcraw/Jinc Lanczos version.
I hope that you fell that it's better now. I do.
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-03T08:36:54-07:00
by NicolasRobidoux
No: I can't have the 3-lobe sharpening artifacts. Reverting to Jinc Lanczos 2. (These images are primarily for numerical testing, not for viewing enjoyment.)
Re: [SOLVED] Donate a high quality raw image to science?
Posted: 2012-06-04T03:58:06-07:00
by henrywho
"-q 1" is VNG ... um....
http://www.libraw.org/articles/bayer-moire.html
Perhaps rawtherapee with LMMSE or AMaZE using "neutral" BW? It seems to have linux binary distributions.