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A suggested virtual 'dcraw' GUI

. . .using SNS-HDR's 'dcraw.exe',   Picture Window Pro,   and the Windows Vista Desktop. . .


Dcraw v9.12 Command Options List


Illustration 1:   the Desktop setup

The suggested Target: text 'dcraw' options include: wavelet noise reduction; no chromatic aberration reduction (see Illustration 5 below); highlight white point blending; camera color balance; sRGB colors; AHD interpolation; chroma noise reduction; fixed white and brightness levels; 2.4 gamma with 12.92 slope; and 16 bit tiff output.

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Illustration 2:

'dcraw' executes and places a *.tiff file in the File Open dialog

Open the *.tiff file and the RGB High Expansion Brightness Curve histogram transform.

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Illustration 3:   Option -b 3 does not result in full dynamic range when analyzed with the RGB High Expansion Brightness Curve histogram.

Close the transform and the image without saving it, then re-open the File Open dialog.

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Illustration 4:   Change option -b 3 to -b 3.75;   left click Apply;   drag/drop the CR2 file once again onto the Shortcut;   the *.tiff file will update;   open it and again check the revised dynamic range with the RGB High Expansion Brightness Curve histogram, repeating as necessary to expand to full range with no highlight clipping.

While one could adjust for full range, the dcraw -b 3 brightness conversion tiff with PWP's RGB High Expansion Brightness Curve transform; experience has been that the final image generally will have better colors if the expansion or white point is established with dcraw and its -b n option.

Once the White Point is established, proceed to make Chromatic Aberration reductions (Illustration 5).

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Illustration 5:   Reducing Chromatic Aberration

PWP's CA transform with a Preview is easier to use than making changes to the -C 1 1 'dcraw' option which is the 'no reduction' default.

Experience seems to indicate that CA reduction prior to any other color or sharpening edits will typically produce a better final image.

Save the reduced CA image tif as a base image for further PWP and/or SNS-HDR processing.

For a suggested SNS-HDR processing of the resulting Illustration 5 image version, see: http://www.ncplus.net/~birchbay/SNS-HDR/example01/index.htm.

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Place your mouse ON the image to see the reduced Chromatic Aberration Preview and settings.
Mouse On and Off Image
. . .Reducing Chromatic Aberration . .

More 2012 TODAY's PHOTOS are here.

Last Update: 120110    (c) IMAGEs by DEN 2012    All Rights Reserved