[Doug]

G'day all,
I am wondering what the general method used for generating and using flat field images is amongst those who use them?

I have proved to my satisfaction that the colour temperature of the light source used in flat production effects the eventual colour balance of the converted image.(one-shot Colour, not mono)

No matter what form of light source is used, ie Tshirt, light box, or dome flats etc. there will be a colour component of some degree.
I have tried to grayscale a flat and use that, however it does not seem to work very well.

I have previously used a blue sky and an overcast sky. Both provide an effective flat field though the colour conversion parameters are very different in each case.

I have a light box about 95% completed which will at least give me repeatable colour temp values, but the issue will still remain for those not using a light box.

I have found that using a G2V star image to establish the correct colour conversion parameters for each new flat field works well but it can be a bit tedious.
I will soon post a zip file containing a dark subtracted G2V star image for those who might like to check their colour balancing, but in the meantime I would appreciate getting a consensus of flat field calibration techniques being used.

Cheers,
Doug