White Balance Magenta/Auto WB

S

stancemedia

Carbonite Member
After a bit of testing with my lights I've found an issue
in white balancing I suppose. I balanced to 5500K as
my lights are daylight balanced. Screen looked alright
however it did exhibit a magenta look but nothing severe.
Took a couple clips with that setting then tested some from
4800-5300.

Well all of the clips were quite magenta it appears. I'm not
sure why so much magenta was coming in. Also I confirmed
it was a white balance issue as I used the 'Auto WB' button
on the side which for the record made the image a bit blue
in the LCD screen, looked great in the edit bay. Perfect WB
actually...

Can you use the 'Auto WB' and find out what temp it's using
to get the appropriate WB? Wouldn't mind using what it deems
as white and dial it in so it won't change.

So I suppose two questions for TLDR.

What's with the magenta with what should be a proper kelvin temp?
(AB Hilit Picture Profile -- No funky WB settings)

If I use 'Auto WB' Can I find out what temp the camera chose?
That way if I can't fix the magenta issue I can just dial in what the
camera thinks is white so it doesn't change scene by scene.
 
Is your WB shift adjusted in your PP?

And im usually indoor or outdoor light and i just set to what they usually are, 3200 or 5600. If it doesn't look white on your camera, then play it with, thats what i do at least.... but if it was blue on your LCD and perfect in you edit bay, you may need to get your screens re-calibrated...
 
No shift at all. Not really positive why it came out
crazy magenta. The only change is the color depth.
Seems to be a universal setting however in most
picture profiles.

Will be hooking up my EVF later for another test
to see what colors it's outputting there.

I assume no others have had this issue?
 
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What kind of lights did you white balance too? Certain lights may say they are true tungsten or daylight balanced but they may not be. Instead of using a fixed white balance number did you try and use a white or gray card to balance to your lights?
 
HMI or HMI type lights are rarely exactly 5500K. Life of bulb , newness or age of bulb can change the color temp by +/- 1000 degrees. If theres a dimmer on the ballast it can change the color temp if its dimmed down.Some have too much magenta or too much green and are corrected with gel to get them closer to uniformity.

Without a color temp meter you will never know these parameters.

With the white balance switch in the A or B position press the white balance button on the side of the camera so you see an A or B and icon in the display where the color temp number is displayed . Place a white card in front of your camera lit by your lights so it covers the whole frame then press the little WB button that sits in between the thumbwheel and the WB switch. You wlll see what the camera calculated the Kelvin number to be for 3 seconds.
 
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mico said:
With the white balance switch in the A or B position press the white balance button on the side of the camera so you see an A or B and icon in the display where the color temp number is displayed . Place a white card in front of your camera lit by your lights so it covers the whole frame then press the little WB button that sits in between the thumbwheel and the WB switch. You wlll see what the camera calculated the Kelvin number to be for 3 seconds.
Click to expand...

I will be doing this from now on I know about this
however the WB Button (Near Auto Shutter Gain etc)
gets a properly WB with just a flick of a button.

Would like to know if it's possible to get the kelvin
temp. from that setting.

Will be getting a digital target however to fix the problem.

Also the lights are not dim able.
 
The A or B settings the way i described is for proper white balancing .You can simply press the small button continuously and get a reading without a white card wherever the camera is pointed if you want. If you want a Kelvin value that you can adjust manually go into menus and set white balance preset to manual. when your switch is on preset you will see a value if you don't see a value press the WB button on the side and it will show you what the WB is set at. If you want to adjust this value press that little button and scroll to your desired white balance number.

Maybe I'm misunderstanding. Is what you want auto tracking white balance so it changes as you move to different light environments? The camera does not have this a s far as I know.
 
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$459 .. and you expect them to be white .. not likely I would suggest

I have 'daylight' PhotonBeards that cost twice that and they are green

I have 'daylight' flouro bulbs and they are yellow!

Anyway, we have the lights we have.

Your simple solution is to WB off the light/a white/grey card illuminated by the light


When you press the WB button the camera adjusts temperature, and tint (Mag->Green)

and then tells you the temperature that it just picked for you, but not the tint

I am getting pretty mad with all of these cameras forgetting that WB gainded through adjusting R->B and G->M

I dont get why the two settings are not displayed and adjustable, on the FS100 it is bad on the new canon it is worse considering the cost differencial

With no onboard RGB histo its even worse.

Anyway; it would seem to me that your options are..

-use the WB (you cant then dial in a warm or cool feel, you need to grade that in later)

-spend a lot of time building a profile that has the the right tint for your light - you will do this by testing a bunch of tints - and evaluating them on a proper editing monitor

if you go down the second road you will understand your light properly and manually swing your WB around it, either diallying in a look, or understanding how to mix it with other light sources

Of course your new PP you will not be able to name so will have to write it on a post it note and sello tape it to your nice new camera :)

SMM
 
another trick you can do is to balance of a 'warm card' which is a bit blue, this will make your light look warm rather than clinical WB cold while killing the M->G swing

S
 
Yeah I figured the camera was using the tint feature
and not displaying what it changed.

I'm able to use the A-B options fine I just had the
issue crop up last night with the lights. Which is
strange since the color is fine it seems just not
to the camera. Dialing it in that is. Still love the
lights however. Good quality light for anyone wondering.

Will be getting a digital target/grey card soon.

Shame it doesn't display the tint change and
the temp. You can change the tint but it's
a bit in the menu system under the picture
profile.

Oh well not the worst thing in the world at all.
 
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