Name: Photoshop Tutorial - FIXING color casts in images
Uploaded: 2023-01-09T18:30:34.000Z
Duration: 12 min 25 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

- [Deke] All right, now we're going to take a look

Auto Tone, Auto Contrast, and then Auto Color.

All three of which look at the luminance data

to adjust luminance data inside Photoshop,

they're click data from people who buy into the program.

together rank among the top 10 most commonly

in which case I want you to know how they work.

So here we are looking at some old school $100 bills.

It just happens to be the best demonstration

That is to say the one that we're not going to change.

for Auto Tone, Auto Contrast, and Auto Color.

I'm going to zoom in on the Auto Tone layer

by Alt or Option clicking on its thumbnail.

And then I'll just zoom out ever so slightly

by pressing Ctrl + minus or Command + minus.

Now what this command does is it finds the darkest pixel

on a channel-by-channel and changes it to white.

So in other words, it makes different modifications

for each of the red, green, and blue channels.

And as a result, not only do we increase the contrast.

But we also get rid of that green color cast

and we create a kind of reddish color cast in the shadows.

if you're trying to get rid of a color cast.

But if you like the coloring of an image,

All right, let's compare that to Auto Contrast.

I'll go ahead and Alt or Option click on that layer

and scoot it down just a little bit here.

Now this command also looks at the darkest pixel

So in other words, it doesn't go channel-by-channel.

So it just finds the darkest pixel makes it darker,

the brightest pixel and makes it brighter.

And as a result, we maintain the green color cast.

So notice, this is the low contrast version of the bill

so darker shadows and brighter highlights

but we have the exact same greenish color cast

All right, compare this to the most complicated

of the auto functions, which is Auto Color.

click on that guy in order to zoom in on it.

And then go up to the Image menu and choose Auto Color.

Now before I choose it, let me explain how it works.

and make it black and neutralize it as well

It's going to do the same thing to the brightest pixel

And then it's going to try to find an exact midtone

I mean leach the color out of it, so that it's gray.

And so notice, as soon as I choose the command,

And so the only colors that are surviving

even in the midtones are these very saturated greens.

by pressing Ctrl + zero or Command + zero on the Mac

is the one that's going to maintain the colors

Subtitles ListPlay Video

Photoshop Tutorial - FIXING color casts in images

ultimately

average

spectrum

bias