White balance fine-tune - Feature Requests - CHDK Forum
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White balance fine-tune

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Offline Cythrelo

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White balance fine-tune
« on: 07 / July / 2008, 21:21:30 »
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Hello!

I'd like a way to fine-tune the white balance to get the kind of result I want. I despise shooting in RAW, so that's out of the question for me, but a simple way to adjust white balance (maybe a menu item that I can put on the quick menu? Something like: -3, -2, -1, 0, +1, +2, +3 and it resets to 0 when you select a different white balance) or even a way to set Kelvin would be awesome.

Thanks!
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Offline dzsemx

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Re: White balance fine-tune
« Reply #1 on: 08 / July / 2008, 02:38:35 »
yes, it would be nice :)
i'd like to have autowhitebalace settings, with the possibility of defining target white balance, correction limits
my camera, a650 has agressive auto white balance and many times people look purpleish on images (especially at evening/cloudy situations) while a630 performs almost perfectly with auto white balalance(maybe it's a little bit greenish)
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Offline cyril42e

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Re: White balance fine-tune
« Reply #2 on: 08 / July / 2008, 05:03:20 »
There is a propcase for white balance, but I don't think it is writable.

On some cameras (eg sd1000) you can choose a custom value by indicating a grey area in your image.
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Offline Cythrelo

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Re: White balance fine-tune
« Reply #3 on: 08 / July / 2008, 07:51:36 »
I do use the custom white balance quite often, but a lot of the time I want something to be warmer or cooler instead of perfectly white, so it doesn't always work out for me.
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Offline jetzt

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Re: White balance fine-tune
« Reply #4 on: 08 / July / 2008, 11:54:44 »
I have a small trick for a specific warm or cool wb, I have done some small experiments with "manual wb" and so I have some almost white, a bit colored cards to "fetch" some effect-wb from them. ;)
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Offline Cythrelo

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Re: White balance fine-tune
« Reply #5 on: 08 / July / 2008, 11:56:42 »
That's a pretty cool idea! Any chance you could post the image you used so that I can print out a set of my own? :)
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Offline jetzt

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Re: White balance fine-tune
« Reply #6 on: 08 / July / 2008, 12:09:20 »
I got them through trail and error, and I don't know anything about the logic behind it, so I really can't give tips on that.
(I didn't spend to much time thinking about it, I didn't even open "Pocketbook of Physics" laying on my table.) :(

But I didn't have to try long, hope that encourages you :D.

Edit: I just decided to do some tests on my lcd, not only with papers I found around in the house. But don't expect any results.
If I get some rules I'll post again.
First simple rule, using "cold" color on paper for wb makes picture "warmer" and vice versus.(about)
« Last Edit: 08 / July / 2008, 12:17:11 by jetzt »
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Offline Cythrelo

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Re: White balance fine-tune
« Reply #7 on: 08 / July / 2008, 12:10:36 »
I'm sure I'll be able to figure it out! Thanks for the idea!  :)
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Offline BB

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Re: White balance fine-tune
« Reply #8 on: 08 / July / 2008, 15:30:57 »
For colored cards--I would suggest you go down to the local paint store and snag a couple sample books/sheets...

And since they have so many color families--pastels, primaries, shades, hues, etc... You can really experiment and see how the differing WB calibration shots end up affecting your final pictures.

Once you find something you like, you can cut and paste them into a little booklet. Plus, they are easy to duplicate if lost or damaged--just go back to the paint store.

If you want something a bit more "standardized and controlled"--you might see if you can get a Pantone color sample book. Perhaps, drop buy a local printer and they may have an old one they can toss your direction.

-Bill
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Offline LjL

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Re: White balance fine-tune
« Reply #9 on: 09 / July / 2008, 07:40:25 »
You could always use the collaborative build with its custom curves. I haven't tried it yet, but if it allows you to define an arbitrary curve for each primary, there you go.

That's, of course, working on the raw data that you despise shooting in, but then so is any form of white balancing that doesn't involve the CCD's analog amplifier ;)
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