Setting white point within levels, using the color picker

J
Posted By
JBach36
Jan 2, 2007
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464
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4
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Closed
I posted this the other day, and to my surprise, no one answered it. Either everyone was getting ready for NYE parties, or no one knew the answer. Here it is again….

You know the 3 color picker icons within levels, right? In theory, when you use the one for white, that point, or color, will then become the brightest white, #255. If that’s true, and you click on the blackest black within the picture, and it turns that black into #255 white, then the whole photo, reds, greens, blues, blacks, everything, should go completely white. But it doesn’t. Why is that?
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MD
Michael_D_Sullivan
Jan 2, 2007
Perhaps the designers of the program assumed that there would be at least some fraction of a unit of difference between white and black? Or perhaps the pickers are using Lab* color or luminosity, rather than RGB 000, 000, 000 / RGB 255, 255, 255 for the black and white points? More fundamentally, the program is designed primarily for rendition of photos, and what you are trying to achieve is contrary to that assumption.
B
Bernie
Jan 2, 2007
If that’s true, and you click on the blackest black within the picture, and it turns that black into #255 white

It will also turn the entirety of the image white, so why don’t you just select all and delete to white instead?
J
JBach36
Jan 2, 2007
I don’t want to turn the image white. I just want to understand the theory behind the white picker. Maybe I’m misunderstanding it. But like I said, if picking a point to make it white (or does it?), and that point is anything OTHER than white, then the whole image should go instantly white. Maybe it doesn’t turn a spot white, so much as it makes that color, let’s say red, the brightest RED, which looks to us like white, but it’s not white, it’s juste a bright, almost white, red. I don’t know.
S
strgzr
Jan 10, 2007
wrote in
news::

I don’t want to turn the image white. I just want to understand the theory behind the white picker. Maybe I’m misunderstanding it. But like I said, if picking a point to make it white (or does it?), and that point is anything OTHER than white, then the whole image should go instantly white. Maybe it doesn’t turn a spot white, so much as it makes that color, let’s say red, the brightest RED, which looks to us like white, but it’s not white, it’s juste a bright, almost white, red. I don’t know.

not sure this is right but its my understanding.
when using the eyedropers in the levels or curves when you select a spot for the white point anything lighter then that point becomes white. when you select a black point everything darker in the photo becomes black. so if the point you select for white has a value of 152 then anything between 152 and 255 become white. if your black point has a value of 45 then anything between 0 and 45 becomes black. hope this helps. if you use the black point on a white selection and that value is 152 then everything between 0 and 152 becomes black.

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