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Author Topic: Sigma Quattro DP2 B&W  (Read 2606 times)

RMW

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Sigma Quattro DP2 B&W
« on: January 26, 2016, 12:27:02 pm »

Hello Fellow Quattro Aficionadoes.

Has anyone been trying out using only the blue channel for B&W images as suggested by the Reid DxO website ?

Be interested to know what your experience has been.

So far I've seen a pronounced increase in contrast in the lighter areas and a mild decrease in noise in the darker ones.

As yet I've not made a print that looks nearly as good as the on screen version. (Process in SPP 6.3. then Adobe Raw and PS. Print in PS on an Epson 1228 in Advanced B&W mode.)

Thanks for reading.

Richard


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RMW

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Re: Sigma Quattro DP2 B&W
« Reply #1 on: January 26, 2016, 01:11:14 pm »

MISPRINT !!!
Actually print on an Epson R2880.
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mediumcool

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Re: Sigma Quattro DP2 B&W
« Reply #2 on: January 26, 2016, 06:48:56 pm »

Back in the bad old days before Photoshop had a channel mixer, on many occasions I used the green channel for greyscale conversion. FWIW.
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RMW

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Re: Sigma Quattro DP2 B&W
« Reply #3 on: January 27, 2016, 04:23:10 pm »

Here's a b&w blue channel only file taken with the Sigma Quattro DP2.
I think my processing gives it only partial justice.
Richard
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xpatUSA

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Re: Sigma Quattro DP2 B&W
« Reply #4 on: February 05, 2016, 03:51:40 pm »

Here's a b&w blue channel only file taken with the Sigma Quattro DP2.
I think my processing gives it only partial justice.
Richard

Nice "swamp-look" shot Richard, especially with those Saw Palmettos. Cypress or Cedar trees?

Processing is not bad at all.

I won't insult you by telling the difference between the Foveon layers on that camera, but if you go to the Sigma Forum on DPR you'll find lots of posts on how they do their gray-scale Quattro shots:

http://www.dpreview.com/forums/1027

Other ways to get B&W out of a Quattro:

Download RawDigger and export the top layer only.

Download Kalpanika's x3f_extract.exe command-line utility and export the blue layer, or use their DNG output to process in LR or PS.

I'm a Merrill and pre-Merrill man myself :)

Today's adventure:

http://www.dpreview.com/forums/post/57223860
.

« Last Edit: February 05, 2016, 03:56:17 pm by xpatUSA »
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best regards,

Ted
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