Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
Gus_Smedstad
professor emeritus
Reged: 07/02/06
Posts: 596
Loc: Boston 42° 16' N 71° 08' W
|
Re: M13 - GREEN (NEBULOSITY)
05/18/08 12:17 PM
|
|
|
I know diddly about Nebulosity, but in IRIS, you have to do a white balance step. The camera's sensor has 2 green masks for every red and blue lens, so anything that processes RAW files will come out green unless you adjust this. Jim Solomon's cookbook recommends 1.96x red and 1.23x blue multipliers for an unmodified Canon SLRs.
Photoshop also has tools for removing color casts which do the same thing. You click an eyedropper on something that's supposed to be gray or white, and it multiplies the color values accordingly. This can be kind of rough to find with an astro image if it isn't of something color neutral like a galaxy core.
- Gus
--------------------
Gus Smedstad
Orion Atlas 8 EQ-G
Orion 80mm f/11.4 guidescope
Orion Starshoot Autoguider
Canon 40D
Philips SPC900NC
|
|
10 registered and 7 anonymous users are browsing this forum.
Moderator: Charlie Hein, knuklhdastnmr
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Rating:
Thread views: 337
|
|
|
|
|
|
|
Previous
Index
Next
Flat
Edit
Reply
Quote
