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blur
04-25-2007, 05:50 PM
Hi folks! I was just processing some really old HK pics just a moment ago, and in the midst of B&W conversions, I suddenly remember reading a tutorial on using Channel Mixer for B&W digital conversions which mentioned that the sum of the RGB slider values should equal 100. Now my question is if this is a must. Is it an advice recommended to be heeded, or it's ok even if the values do not sum up to 100?

If the values do not sum up to 100, are there any effects on the details/quality of the picture?

Just curious. Pardon my crappy brains if this so happens to be an absurd question :D
ShaolinTiger
04-25-2007, 05:52 PM
If it's over 100 it will have the effect of increasing exposure (brighten), and less than a hundred will decrease exposure (darken).

It's not a rule that needs to be heeded, just choose which channel you are gonna have as the primary, then twiddle the other two until you get something you like.

The aim with black and white is to avoid any blown highlights and to retain as much shadow detail as possible.
blur
04-25-2007, 06:06 PM
If it's over 100 it will have the effect of increasing exposure (brighten), and less than a hundred will decrease exposure (darken).

It's not a rule that needs to be heeded, just choose which channel you are gonna have as the primary, then twiddle the other two until you get something you like.

The aim with black and white is to avoid any blown highlights and to retain as much shadow detail as possible.
Aaaaaahhhh, the dark tunnel has started to become brighter now :D Thanks, ST!
leslie
04-25-2007, 07:56 PM
come to the dark side of black and white film and u will see a different light :D

btw blur you have lovely pics, thanks for posting up in SA
blur
04-26-2007, 11:26 AM
come to the dark side of black and white film and u will see a different light :D
Usually my initial response would be "wat? film???!!! :0:0:0:0:0" :D:D But recently I was contemplating if I could try some B&W with an old Nikon EM I found stashed in my dad's drawers (if it's still working, that is!!) :D Will see how la :) Thanks, leslie!