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Hi Dean
Thanks for your useful comments. I usually save my DSI2 files as .tif. Yesterday I found a stack of 40x2min images taken when I was trying to image the Keyhole using a O3 filter. The composite image did not turn out much good but I post combined the images using Drizzle with a resolution factor of 2 and pixel fraction of 0.7. I was pleasantly surprised to see that pixelation of the stars was considerably reduced and the DSI2's tendency to produce false colour of the very small stars was eliminated.
I have come to the conclusion that to use Drizzle it is necessary to have a large number of images to stack. Previously I have not had much success in Drizzle with up to about 10 images. I do not know what the lower limit of images is satisfactory but I will persevere with experimenting!
Cheers Peter
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