Need colour correction advice for stitching images

[Peter Shute <pshute@xxxxxxxxxxxxx>]

I have scanned some photos and wanted to stitch them together. It
worked ok, but looked bad because a couple of them need colour
correction.

They are long exposure night shots of New Years Eve fireworks. I took
one series of shots with 10 second exposure, then another with 20. One
set of shots is more purple than the other set because of the longer
exposure. Naturally, the best fireworks bursts were on different sets.
So now I need to correct one set so I can choose images from either
set.

I'm not experienced at colour correction, but found a function in my
software (Corel Photopaint 8.0) that looks like it should do it. This
option allows you to adjust hue, saturation or brightness of all
colours at once, or of red, yellow, green, cyan, blue, or magenta
individually.

When I increased the saturation of red by 50 (percent?) and decreased
magenta by 80, it seemed to have corrected it. But I can't get it
right enough that you can't see the variation when stitched. I find it
difficult to judge when it's right without going throught the whole
stitching process.

Can anyone give me any tips that will make it easier? Am I on the
right track?


Peter Shute