Pixel shift may actually be a winner...

**tduell** · 11-01-2015, 10:25 PM

Originally posted by jbinpg

[snip] What I like about dcrawps is that you can tune the detection of pixel motion by command arguments and it will smooth out any detected pixel aberrations before compositing the final image.

Does dcrawps do that?
I see two dcrawps options that are related to PS, but neither suggest that dcrawps does any smoothing of the final image.

-G <num> Green channel PS artifact detect threshold %% (default = disabled)
-X Mark green channel PS artifacts with a purple marker in the output

Can you elaborate on how you get dcrawps to smooth the final image?

Cheers,
Terry

**jbinpg** · 11-02-2015, 05:11 PM

Yes, dcrawps does pixel smoothing. Here is the readme from the author's webpage:

-G 1-99 1 detects the lightest artifacts (1% change in green level)
99 detects only the largest artifacts (99% change)
default is 100, artifact detection/repair disabled.

-X highlight artifacts in the output. If -G is not set it is set to 20%.

So you would need to set -G 100 (the default) to disable repair. Any other -G setting would enable repair. So using neither argument would disable repair and show you up to 20% of artifacts. This allows you to play with -X to see how many artifacts are in the image, then use -G xx to actually do the repair once you have found the sweetspot.

Jack

**tduell** · 11-02-2015, 05:32 PM

Originally posted by jbinpg

Yes, dcrawps does pixel smoothing. Here is the readme from the author's webpage:

-G 1-99 1 detects the lightest artifacts (1% change in green level)
99 detects only the largest artifacts (99% change)
default is 100, artifact detection/repair disabled.

-X highlight artifacts in the output. If -G is not set it is set to 20%.

So you would need to set -G 100 (the default) to disable repair. Any other -G setting would enable repair. So using neither argument would disable repair and show you up to 20% of artifacts. This allows you to play with -X to see how many artifacts are in the image, then use -G xx to actually do the repair once you have found the sweetspot.

Jack

Thanks for that explanation.
The repair ability certainly isn't apparent from the help text I see here.

Cheers,
Terry

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11-01-2015, 10:25 PM	#61
tduell Loyal Site Supporter Join Date: May 2015 Location: Melbourne Posts: 1,514	Originally posted by jbinpg [snip] What I like about dcrawps is that you can tune the detection of pixel motion by command arguments and it will smooth out any detected pixel aberrations before compositing the final image. Does dcrawps do that? I see two dcrawps options that are related to PS, but neither suggest that dcrawps does any smoothing of the final image. -G <num> Green channel PS artifact detect threshold %% (default = disabled) -X Mark green channel PS artifacts with a purple marker in the output Can you elaborate on how you get dcrawps to smooth the final image? Cheers, Terry

11-02-2015, 05:11 PM	#62
jbinpg Site Supporter Join Date: Mar 2008 Location: Prince George, BC Photos: Gallery \| Albums Posts: 3,546	Yes, dcrawps does pixel smoothing. Here is the readme from the author's webpage: -G 1-99 1 detects the lightest artifacts (1% change in green level) 99 detects only the largest artifacts (99% change) default is 100, artifact detection/repair disabled. -X highlight artifacts in the output. If -G is not set it is set to 20%. So you would need to set -G 100 (the default) to disable repair. Any other -G setting would enable repair. So using neither argument would disable repair and show you up to 20% of artifacts. This allows you to play with -X to see how many artifacts are in the image, then use -G xx to actually do the repair once you have found the sweetspot. Jack

11-02-2015, 05:32 PM	#63
tduell Loyal Site Supporter Join Date: May 2015 Location: Melbourne Posts: 1,514	Originally posted by jbinpg Yes, dcrawps does pixel smoothing. Here is the readme from the author's webpage: -G 1-99 1 detects the lightest artifacts (1% change in green level) 99 detects only the largest artifacts (99% change) default is 100, artifact detection/repair disabled. -X highlight artifacts in the output. If -G is not set it is set to 20%. So you would need to set -G 100 (the default) to disable repair. Any other -G setting would enable repair. So using neither argument would disable repair and show you up to 20% of artifacts. This allows you to play with -X to see how many artifacts are in the image, then use -G xx to actually do the repair once you have found the sweetspot. Jack Thanks for that explanation. The repair ability certainly isn't apparent from the help text I see here. Cheers, Terry