would someone be kind enough to explain the 3 colour Hi
Hi everyone, I always refer to the standard historogram but have no understanding of the 3 colour type. What confuses me is that if one colour channel was found to be over exposed then we can't adjust the exposure of that single channel anyway.
Obviously I am missing something.
Hope you can help and thanks, regards Greg.
#1. "RE: would someone be kind enough to explain the 3 colou" | In response to Reply # 0Frenchie Registered since 06th Oct 2004Sat 19-Aug-06 04:26 AM
Obviously you already know that the red, green and blue channel histograms give you exposure info on each of those three colour channels. If you see from this that one of the channels is 'blown' you correct it by reshooting with a reduced exposure. As you have correctly identified, it's not possible to adjust the exposure for just one channel.
A typical example would be a shot of geraniums in full bloom in bright sunshine. The composite histogram might tell you you have a perfect exposure overall, but a look at the RGB histos will probably show you that the red channel is blown big-style. And, when you look at a magnified image on your LCD, you'll see that the flower petals are indeed blown. Therefore you reduce the overall exposure and try again.
It's a very useful tool and one I use often here in the bright summer light of southwest France.
"Cameras don't take photographs, people do" - John Hedgecoe said that.
"Expose for the highlights and let the shadows take care of themselves" - Ansel Adams said that.
"The camera is only a tool. The best saw in the world won't make you a great carpenter" - I said that
A few photos, here for a reason
#2. "Thanks a lot Frenchie" | In response to Reply # 1Cruiser2091 Registered since 05th Jan 2006Sat 19-Aug-06 05:33 AM
It's amazing how simple things can be when they are explained but how confusing they are beforehand.
I had searched the net before posting and all I came up with was the standard histogram
Shows how helpful this forum is.
Once again thanks, regards Greg