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DPChallenge Forums >> Tips, Tricks, and Q&A >> Why does white paper background appears blue?
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07/09/2005 01:57:16 AM · #1
I have been using plain white paper as background in photographing objects. But in most cases, the white background appears as Blue. This colour cast does not go off completely even after adjusting levels/Contrast. Is there a way out? Please help.
07/09/2005 01:58:44 AM · #2
that's probably a White balance issue. Try the channel mixer... I have a terrible time getting it to work though! Anyone else have suggestions?
07/09/2005 02:05:08 AM · #3
Originally posted by kbhatia1967:

I have been using plain white paper as background in photographing objects. But in most cases, the white background appears as Blue. This colour cast does not go off completely even after adjusting levels/Contrast. Is there a way out? Please help.


Post an example please, unedited?

Robt.
07/09/2005 02:10:14 AM · #4
Originally posted by kyebosh:

that's probably a White balance issue.


That would be correct.
07/09/2005 02:16:35 AM · #5
This is certainly a white balance issue. I have been taking most of such images in open shade. I have tried different white balance settings available on my camera. But no setting gives a white a different colour cast.
Post-processing is a must I feel, but it does not yield desires results.
For example you can see my submission 'The kiss' in the 'Minimalism' challenge. The blue cast can be seen at the upper left corner, which did not go even after Post-processing.

Message edited by author 2005-07-09 02:19:18.
07/09/2005 02:27:11 AM · #6
I had the same problem with this:
61666.jpg
(halogen light on printer paper)

I used the eyedropper to choose another white point.
07/09/2005 02:37:31 AM · #7
Originally posted by kbhatia1967:


Post-processing is a must I feel, but it does not yield desires results.
For example you can see my submission 'The kiss' in the 'Minimalism' challenge. The blue cast can be seen at the upper left corner, which did not go even after Post-processing.


170699.jpg

Simple cloning of the corners would take care of it, but not basic legal. Always can crop out the corners.
07/09/2005 02:43:36 AM · #8
On my Nikon D70 and Coolpix 3700 I do not seem to have this problem. Under fluorescent light, I just tried both cameras with Automatic White Balance and got white-gray results (depending on the exposure). There was no color shift. I got the same (and better) results after presetting the WB based on the white background. I got only bad results with the WB set on fluorescent light.

I have the following possibilities to adapt the WB:

1- I am able to preset the white balance manually. In WB preset mode, I take a picture of the white page under actual lighting (assuming I will not use flash, because that would change the temperature of the light) and the camera adapts the WB according to the actual light temperature.

2- The other possibility is to shoot RAW and play with the WB afterwards in Nikon Capture (only possible with D70)

3- There is a number of WB choices on the camera (both cameras) and each one can be modified a bit (by dialling in -3 to +3 changes to the selected WB; only on the D70)

I do not know whether any of the alternatives are possible in your setup. Worthwile to check it out since I can even preset the WB on the small Coolpix 3700.

Good luck.

Kind regards
Don
07/09/2005 03:04:35 AM · #9
Originally posted by kbhatia1967:

This is certainly a white balance issue. I have been taking most of such images in open shade. I have tried different white balance settings available on my camera. But no setting gives a white a different colour cast.
Post-processing is a must I feel, but it does not yield desires results.
For example you can see my submission 'The kiss' in the 'Minimalism' challenge. The blue cast can be seen at the upper left corner, which did not go even after Post-processing.


You should have an open shady or cloudy white balance setting on that camera, and it should work fine for what you have described. It sounds like you are set on WB for a sunny day, which is warmer light than open shade. Open shade has much larger blue component.

R.

Robt.
07/09/2005 03:50:41 AM · #10
Krishan, your S1 IS has custom WB if you point the camera at the white background so that nothing else is visible and set the WB using this, you should get an almost perfectly balanced shot assuming the lighting doesn't change before you take the shot. It is always best to try and get this right in camera over relying on photoshop to "rescue" photos in my opinion.
Hope this helps!
07/09/2005 04:31:06 AM · #11
to get a pure white your background should be independantly lit about one stop brighter than your key light .that should give you the pure white

Message edited by author 2005-07-09 04:33:33.
07/12/2005 01:27:56 PM · #12
Presetting in the Custom White Balance mode, appears to solve the problem. I will try it and let you know. Thanks to all who helped!

Message edited by author 2005-07-12 13:28:50.
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