Name: Photoshop教程--修復影像中的色差 (Photoshop Tutorial - FIXING color casts in images)
Uploaded: 2023-01-25T18:31:05.000Z
Duration: 12 min 25 s

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

- [Deke]好了，現在我們要看一下

Auto Tone, Auto Contrast, and then Auto Color.

自動色調，自動對比度，然後是自動顏色。

All three of which look at the luminance data

這三種方法都是研究亮度數據的

to adjust luminance data inside Photoshop,

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

他們是來自購買該計劃的人的點擊數據。

自動色調、自動對比度和自動顏色

together rank among the top 10 most commonly

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

在這種情況下，我想讓你知道它們是如何工作的。

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

是以，我們在這裡看到的是一些老式的百元大鈔。

那麼你已經看到了這個樣本文件。

It just happens to be the best demonstration

於是我們就有了這個左上角的法案。

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

就是說我們不打算改變的那個。

for Auto Tone, Auto Contrast, and Auto Color.

自動色調、自動對比度和自動顏色。

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

by Alt or Option clicking on its thumbnail.

通過點擊其縮略圖的Alt或Option鍵，就可以實現。

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

現在這個命令的作用是找到最暗的像素點

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

在逐個通道上，將其改為白色。

So in other words, it makes different modifications

是以，換句話說，它做出了不同的修改

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

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

結果是，我們不僅增加了對比度。

But we also get rid of that green color cast

但我們也擺脫了那種綠色的色差。

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

而我們在陰影中創造了一種偏紅的顏色。

是以，自動音調可能真的很有用

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

But if you like the coloring of an image,

但如果你喜歡一個影像的著色。

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

好吧，讓我們把它與自動對比度進行比較。

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

我將繼續前進，並在該層上點擊Alt或Option。

and scoot it down just a little bit here.

Now this command also looks at the darkest pixel

現在這個命令也是看最暗的像素

但它是在一個綜合的基礎上這樣做的。

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

是以，換句話說，它不會逐個管道進行。

So it just finds the darkest pixel makes it darker,

所以它只是找到最暗的像素，讓它變得更暗。

the brightest pixel and makes it brighter.

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

是以，我們保持了綠色的色差。

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

所以請注意，這是法案的低對比度版本

so darker shadows and brighter highlights

but we have the exact same greenish color cast

但我們有完全相同的偏綠的顏色

All right, compare this to the most complicated

of the auto functions, which is Auto Color.

的自動功能，也就是自動色彩。

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

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

然後進入影像菜單，選擇自動色彩。

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

現在在我選擇它之前，讓我解釋一下它是如何工作的。

and make it black and neutralize it as well

並使之成為黑色，同時中和它。

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

它將對最亮的像素做同樣的事情

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

然後，它將試圖找到一個精確的中間色調

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

我的意思是把它的顏色浸出，使它變成灰色。

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

於是注意到，只要我選擇了這個命令。

And so the only colors that are surviving

even in the midtones are these very saturated greens.

甚至在中間色調是這些非常飽和的綠色。

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

這樣我們就可以接受所有的賬單。

is the one that's going to maintain the colors

字幕列表影片播放

Photoshop教程--修復影像中的色差 (Photoshop Tutorial - FIXING color casts in images)

ultimately

average

spectrum

bias