Modified 300d - flat frame - removing pink hue accurately

I'm trying to remember again, I have a modified 300d and have taken some images which I would like to remove the pink hue from.
I have also taken a flat frame of a white sheet of paper in daylight at the same exposure and f/ratio as the original - good signal midway in the histogram.
What's the best way to apply the flat frame in PS?
Is it a simple subtraction?

Also, the custom white balance in the 300d -> am I correct in saying that this processing only takes place within the camera on jpg images and not to RAW files?

Thanks,

Michael.

Hi Michael

If you do the flat frame subtraction in deep sky stacker it will take care of this for you. As long as the data is in RAW form the white balance shouldn't make any difference.

Gentlemen,

Please note that we never subtract a flat frame. You are thinking of a dark frame which gets subtracted from the light images.

A flat frame is divided into (and not subtracted).

Anthony.

PS. I forgot to answer the original question ... we subtract in Photoshop using the DIFFERENCE option in the blending mode when layering two images.

If using CCD software (ex. AIP4Win, CCDStack etc), look for either "calibration" or "pixel math". The first will do the work for you on its own provided you specify the master images of interest (ex. master dark and the light frames). For the second, you will do it directly by specifying the first and second images (light frame and master dark, respectively) and then selecting subtraction for the operation.

Anthony.