Arp 245 reprocessed. [Archive]

View Full Version here: : Arp 245 reprocessed.

sjastro

11-03-2008, 05:20 PM

As pointed out by Jase, the colour balance was a bit of a mess caused by a compressed histogram in the green channel. Here is a complete redo.

http://users.westconnect.com.au/~sjastro/arp245c.html

Regards

Steven
http://users.westconnect.com.au/~sjastro/small

jase

11-03-2008, 05:29 PM

A much improved rendition Steven. Well done. The data still looks clipped though. Is this intentional to circumvent the uneven field illumination? Are you applying (dividing) flats?

Cheers

sjastro

11-03-2008, 11:14 PM

Hello Jase.

I take flats using a luminous painted light source which slips inside the dust cover.
http://users.westconnect.com.au/~sjastro/flatglow.html

I never have a problem with uneven illumination.

Unfortunately flats are completely useless when the CCD window frosts over as occurred in this case. I was forced to clip the histogram.

Regards

Steven