Thanks all. Your comment noted Ken about the lack of blue stars. Here is a better version. I still have to work out how to get the star colours 'correct'. This method is still a work in progress. I am finding that all adjustments are better made in the HDR image and only finally slightly tweak the LDR image in PhotoShop. It is obvious to me now that when the HDR image is converted to the LDR image a lot of information is lost and no adjustment can get it back. It is worse than converting a 16 bit image to a jpg!
Large image 1.8MB
http://members.optusnet.com.au/~fmlee/NGC3532_2.jpg
I have added an image from the Rho Oph region to show what I can squeeze out now. It is not quite right I need more data.
Bert