July 08, 2006

Color correction?

How the heck do you do color correction for pictures taken at night?

While coming back from a cruise up to Lake Piru this evening (I went to drive a new road which turned out to be dirt, so I passed) I eventually caught a pack of slow folks near the top of Grimes Canyon leading me to stop.

I had the camera and a tiny tripod I keep in the camera case, the full moon was rising and I figured I'd give it a shot. I setup the tripod on the trunk and took about a dozen shots. It worked! (now I need to go back and get some tail lights, I caught just a whiff) Using various exposure times between 1.2 and 4 seconds and f-stops between 2.8 and 5.0 I caught a lot of shots that look a lot like day light. Except they're really blueish purple, like this:

Night time moon rise in Grimes Canyon

That's the window of my car on the bottom right. I'm sure there's some tinting but it's definitely not normally blue. And just to prove that I can't get things right even with light, here's a shot of Lake Piru taken just above the dam about 35 minutes earlier.

Lake Piru near sunset from just above the dam

I hate image manipulation software, it makes me feel so stupid.

Posted by Dave at July 8, 2006 11:42 PM
Trackback URL: http://homie.dijas.com/mt/mt-tb.cgi/566
Comments

Color correction is always the same. In Photoshop you go to the menu -- layer -- add an adjustment layer -- curves. In curves you select a grey point with the middle dropper, it is grey. This is looking for 18% grey (which is what neutral is for a camera). You find a point which is close by knowing what its real color was. The white of an eye in not quite direct sunlight is a middle grey. Certain shades of blue will also help you.

Posted by: Nathaniel on July 29, 2006 09:20 AM commLink