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Old 03-11-2013, 08:05 PM
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5ash (Philip)
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5ash is offline
 
Join Date: Mar 2005
Location: Hunter valley. nsw
Posts: 1,117
Whoops , done it again.

Tried to take a picture of the helix nebula early last week. everything went well , aligned mount , synched on formalhaut to get better accuracy then goto to the helix, set 60D to iso6400 ,did a 30sec exp.Yes it was centred , took 13 x 10 min shots but forgot to reduce the iso speed back to 800. the pics were very washed out as you might expect however i stacked them without darks and flats in DSS and as you might expect the result was just so washed out it came out as a white screen on the computer. However i looked at the RGBK and moved all the channels to the left , adjusted the luminance controls to get a curve through the channels display that looked "normal" ( the curve you get with normally exposed pictures) . I then started to see a fairly normal image of the helix appear. I then increased the saturation and bingo i had a fairly "decent" picture , not good though , i expect much better when i di it properly . I then saved it as a Tiff and tweaked the levels and curves in photoshop.
The first picture is one of the RAWS and the second the DSS picture ( no darks or flats) processed in DSS and tweaked in photoshop. I havent put this picture up as an example of my photography but to show what the processing functions in DSS can do. I will just have to make a check list so i dont make the same mistake again , thats what happens when you get older i suppose.
regards (deflated) philip
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