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White point vs. Gray
Authored by: wisechoice on Feb 10, '05 01:12:37PM

iPhoto is not setting the white point, it is balancing the point you click on to be colour-neutral, and adjusting the other colours in the image in relation to it. This has nothing to do with brightness. So if you command-click on something that should be neutral black or grey or white, it will make adjustments.

Photoshop lets you set independent white point, mid-grey and black points and takes luminance into account. If you have all three of those in a photo, you can correct both colour and density perfectly.

iPhoto is adjusting the tint and temperature only. Quite useful, but it may take a few tries. The thing to keep in mind is that the point you command-click on does not need to be white, it can be grey or black as well.

If your photo has more than one type of light source (sunlight, flourescent, incandescent), this will not work perfectly because the different colour "temperature" of light sources is what causes photos to be off in the first place. If you don't have a uniform colour temperature from the light sources in your photo, some things that should be white will have a blue, yellow or green cast.



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