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Thanks all. Jase the keyhole may be washed out but just next to it Eta Carina can be seen clearly elongated with colour. The difference in brightness is huge but the HDR method seems to cope. Of course this depends on the exposure ranges in this case the image potentially has 18 bits of dynamic range or 262,144 levels compressed into first a 16 bit (65,536 levels) tiff and then after a bit of image processing finally converted to an 8 bit (256 levels)jpg that you see here.
Of course the HDR image is linear in response and when this is converted to a tiff with EasyHDR the logarithmic response of the human eye/brain is imposed on the data.
I would be interested to see what a 16 bit camera could do with this method. If you used the same number of exposure ranges ie 6 you would potentially have 22 bits or 4,194,304 linear levels.
Bert
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