[SOLVED] Donate a high quality raw image to science?

[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.

[NicolasRobidoux]

I actually think that the white point is just fine. And black point at 2585.

[NicolasRobidoux]

henriwho: I'm just going to do it: black point up to 3035 and up the contrast from 5 (default) to 8.

[NicolasRobidoux]

I think this last one was overdoing it. Maybe it looks better, but it is less "natural".

[NicolasRobidoux]

Henry: I decided to keep the one I had before trying to tweak.

[henrywho]

Actually, the color of "apartment.tif" is a bit off, kinda green-cast there. What something like:

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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?

[NicolasRobidoux]

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.)

[NicolasRobidoux]

(deleted B/C wrong)

[NicolasRobidoux]

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

[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.

[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.

[NicolasRobidoux]

henriwho: Yours will be the only image downsampled with Jinc Lanczos.

[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.

[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.)

[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.