Not Your Everyday Banana

by Bart Arondson

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Which photo has the more correct White Balance? For me the second is much better than the first. My understanding is that the R+G+B histogram needs to be as balanced as possible. Is this true, or does it depend?

Before and After

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Microscopes usually have one type of light illuminating the stage. If you need correct white balance, use the color temperature of that bulb. –  Phil Jan 30 '13 at 17:38
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3 Answers 3

up vote 2 down vote accepted

Like with photograhps in general, it's down to opinion and there is no real "correct".

White Balance is based on Colour Temperature where different light source temperatures create unnormal colours (to what we see with our eyes).

Here's is a table of typical light source scenarios:

From Media College From here.

In processing the image, whether in camera or PP on a computer, it adjusts the overall colours of the image to look more redish or blueish.

In your particular image:

The original image shows no clear overall redish or blueish, so it's hard to tell. It may not even have needed WB adjustments but the first one has a slight red tinge to it in the "silver" areas. In my opinion, the first one is better and didn't need adjusting however, the second is more "silvery" because of the more blueish tinge. It neutralised the grey areas more.

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This is what I need, to neutralize the grey areas (which is ~70-80% of the photo). This is the reason why I applied a WB to the first photo, because there is more reddish-tint. Certainly, the reddish tint is from the source lamp of the microscope. –  Apopei Andrei Ionut Jan 30 '13 at 10:15
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Without referencing a white object in your photo, we cannot decide which one has a better white balance. In short, white balance is process of removing unrealistic color cast on your image, i.e., correct the white area in your image that captured as gray. So it cannot be judged by histogram. If you know what part of your image should be white and the image is not affect by other light source, you can adjust the rgb balance in your image until the white part has a balanced rgb value.

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Unless we know his original image was of something neutral grey, which might be the case here. –  MikeW Jan 30 '13 at 9:44
    
The referencing white area from that image is that with ~white tint. In the first photo, that area has a yellow tint and in the second photo (for me) seems to have ~white-cold tint (good WB). Note: The photos was taken with a microscope, so I can't use a grey card, or something like this. The only reference is that area with ~white tint (the larger one / 80% area of the photo). –  Apopei Andrei Ionut Jan 30 '13 at 9:50
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The technically correct white balance setting is the setting that "cancels out" the color of the lights lighting your scene so that the color of items in your image is the same as the color in real life.

You can't judge white balance from the histogram or anything in the photo without some reference to that item real color (that's how the white balance "eye dropper" works - you tell him that the specific color in the image is actually white or neutral gray and it re-calibrates the entire image around it).

And finally, unless you are shooting products or photojournalism you don't have to limit yourself to the "technically correct" white balance, playing with white balance can create very nice effects (especially if you have multiple lights with different WB and you set them up intentionally)

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