SD15 Full Spectrum w/ Visible Filter - Street

xpatUSA wrote:

tagscuderia wrote:

Yeah that matches Merrill with a RAW composite − UFRaw gives you the same starting point, but within a RAW editor, just in case it's useful to you.

And yeah, Auto WB and FS don't mix; making another dangerous assumption that you weren't looking at the world through rose tinted glasses?

P.S. why not a Custom WB? Just out of curiosity.

WB makes no difference to raw values, Tom, and I convert with RawDigger.

Yeah I know, I was wondering what the benefits of using a RAW composite are over SPP... ?

By that token, a RawDigger raw composite export is completely unaffected by the in-camera WB setting; and for the RawDigger RGB export (for that capture) the three RawDigger WB options made very little difference so I left it at "As Shot".

Somehow RawDigger's 'LibRaw' conversion does a much better job than SPP's insane magenta look for full-spectrum shots - I never use SPP for them!

LibRaw is producing a straight composite, with zero scaling/gain vs SPP's 3x3 White Balance matrix − the "insane magenta" is because you're using a visible light WB matrix; Auto WB is not tuned for Full Spectrum, NIR or Infrared and seemingly defaults back to Daylight or similar.

In IR or FS work, I don't understand people's emphasis on WB - especially Custom. Do you?

For Infrared, White Balance is pointless but for FS, absolutely! And it has to be Custom because (obviously) none of the presets are going to work... So have you never shot FS with a Custom WB taken off a grey card?

P.S. I wish that SIGMA would support FS properly in SPP, they could have easily added a WB preset and a colour mode (including unique tone curve) for FS