SD Q Colour

Started 3 months ago | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 16,471
Re: SD Q Colour

Macrae wrote:

There has been some celebrating SDQ colour recently. As I have said in the past that this has never been my experience. That said, and with a friend trying to get a handle on his new SDQ, I attempted once again to discover what I must be doing wrong. Seems thirteen years experience with Sigma and working daily with the cameras and having worked professionally for 33 years and my own studio for 25+ years just isn't enough,

Sigma sd Quattro H

Sigma sd Quattro

There is a lack of numerical information in this thread but there is a lot of SPV*.

To redress the balance as regards reds:

My X-rite Card data sheet, CIELAB numbers:

L* = 42.101; a* = 53.378; b* = 28.19

The posted DPR image open in RawTherapee 5.5:

L* = 41.2; a* = 55.6; b* = 37.9 ... the b* axis value is unacceptable

The OP's test shot open in RawTherapee 5.5:

L* = 39.4; a* = 43.2; b* = 27.6 ... the a* axis value is unacceptable

A sample of two Q test shots out of the many published does not inspire much confidence, statistically speaking.

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* SPV = Standard Photographic Vague
Ted

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