SD15 Full Spectrum w/ Visible Filter - Street

tagscuderia wrote:

xpatUSA wrote:

tagscuderia wrote:

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... ?

For FS, I use RawDigger's RGB export, not raw composite. The RGB export remains superior to SPP 5.5.3 RGB for SD15 shots.

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

A "straight composite" is not the option that I use. LibRaw in RawDigger also offers an RGB conversion which is what I use. In Preferences, the RawDigger WB selections make little difference to the RGB review image so, again, I leave it 'As Shot'.

− 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?

I don't recall trying with the SD15 but it was rarely successful with the SD14. The SD1M was better at the capture but, when all said and done, the main reflectors of IR came out less red which is not what I'm looking for.

Since you keep pushing Custom WB, Tom, what do you get over shooting with any preset WB and adjusting in post?

Bearing in mind that the SPP "magenta" comes from the green RGB channel being forced to zero, does a Custom WB actually fix that?