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PLEASE HELP ME EDIT: 8+ hours of wide field m45 data
- Thread starter Sir Canon
- Start date
I took just your lights, no bias, darks or flats. And did a quick try, Raw conversion in ACR with lens profile. Stacked all 50 in DSS, output 16-bit tif (no dss color mangling), the stretch with these parameters:
rnc-color-stretch m45-sir-canon.dss-avg50-c1.tif -rootpower 90 -rootpower2 4 -scurve1 -setmin 4000 4000 4000
The ACR lens profile was not great, and there is some gradients, to tried to reduce those problems. Here is the result so far:
Roger
swimswithtrout
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Sir Canon
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thank you roger, looks good. im still very confused as to why we all cannot manage to get a flat background from this set, its very unfortunate. i am going to turn off auto roataion on my camerar and take a new set of darks that are all of the same orientation and see if that will help anybody.I took just your lights, no bias, darks or flats. And did a quick try, Raw conversion in ACR with lens profile. Stacked all 50 in DSS, output 16-bit tif (no dss color mangling), the stretch with these parameters:
rnc-color-stretch m45-sir-canon.dss-avg50-c1.tif -rootpower 90 -rootpower2 4 -scurve1 -setmin 4000 4000 4000
The ACR lens profile was not great, and there is some gradients, to tried to reduce those problems. Here is the result so far:
Roger
--
I tend to overdo things
BlackgumNate
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Roger,I took just your lights, no bias, darks or flats. And did a quick try, Raw conversion in ACR with lens profile. Stacked all 50 in DSS, output 16-bit tif (no dss color mangling), the stretch with these parameters:
rnc-color-stretch m45-sir-canon.dss-avg50-c1.tif -rootpower 90 -rootpower2 4 -scurve1 -setmin 4000 4000 4000
The ACR lens profile was not great, and there is some gradients, to tried to reduce those problems. Here is the result so far:
Roger
Thanks for giving this a shot.
Would more of the background dust show without the 'scurve' part of the stretch? Why has Michael's PI rendition shown so much more 'background' dust?
Nate
I'm a little late to the party. I took a quick 20 minute crack at this to see what was there. I didn't worry too much about correcting the field issues, and the background is bright to my taste (looks ok on my higher contrast monitor I suppose). I was in a rush so I processed off the Tiff you provided, and didn't do any additional colour calibration other than a dynamic background extraction. I also left the saturation alone, so this is just the result of intensity stretches on the Tiff file.
Edit: made a second adjustment tonight to crop out the worst of the background gradient, and added some saturation. Normally I would spend the time to mask the saturation to preserve the background, but in this case I just hit the whole image with it.
Further edit: something weird is going on with the stars. I think I tripped myself up with some sloppy masking on the noise reduction and it left odd star profiles.
Edit: made a second adjustment tonight to crop out the worst of the background gradient, and added some saturation. Normally I would spend the time to mask the saturation to preserve the background, but in this case I just hit the whole image with it.
Further edit: something weird is going on with the stars. I think I tripped myself up with some sloppy masking on the noise reduction and it left odd star profiles.
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The background dust is there, just my method kept the color--it is harder to see blue dust on a dark background. The PI workflow did 2 things: "neutralize" the background, changing the color to more gray, and the background extraction created a dark hole around the Pleiades. I commonly see this in pixinsight processed images: large bright things cause the background removal tool to remove too much, creating a dark hole.Roger,I took just your lights, no bias, darks or flats. And did a quick try, Raw conversion in ACR with lens profile. Stacked all 50 in DSS, output 16-bit tif (no dss color mangling), the stretch with these parameters:
rnc-color-stretch m45-sir-canon.dss-avg50-c1.tif -rootpower 90 -rootpower2 4 -scurve1 -setmin 4000 4000 4000
The ACR lens profile was not great, and there is some gradients, to tried to reduce those problems. Here is the result so far:
Roger
Thanks for giving this a shot.
Would more of the background dust show without the 'scurve' part of the stretch? Why has Michael's PI rendition shown so much more 'background' dust?
Nate
Here is the blue channel from my stretching result:
blue channel shows the dust.
Note there is no hole around the Pleiades. I also fixed the dust mote. It was a 20 second fix: do a feathered selection and multiply using the curves tool to bring up the signal. You will also notice less streaking (pattern noise) in the background.
Roger
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