at all three of the auto commands

在所有三個自動指令中

that reside here in the Image menu,

駐紮在這裡的影像菜單中。

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

on a channel-by-channel basis

在逐個管道的基礎上

and make changes automatically

並自動進行修改

without even bringing up a dialogue box.

甚至沒有出現一個對話框。

Now even though they sometimes work,

現在，即使他們有時會工作。

I am by no means suggesting

我決不是在建議

that they are the best ways

它們是最好的方法

to adjust luminance data inside Photoshop,

來調整Photoshop內的亮度數據。

but they might be the most popular.

但它們可能是最受歡迎的。

Based on Adobe's analytics data,

基於Adobe的分析數據。

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。

Auto Tone, Auto Contrast, and Auto Color

自動色調、自動對比度和自動顏色

together rank among the top 10 most commonly

一起躋身最常見的前10名

used features in the software

軟件中使用的功能

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。

And if you've seen my course before,

而如果你以前看過我的課程。

then you've seen this sample file.

那麼你已經看到了這個樣本文件。

It just happens to be the best demonstration

它恰好是最好的示範

I've come up with.

我想出了一個辦法。

And so we've got this top left bill,

於是我們就有了這個左上角的法案。

which is our control image.

這就是我們的控制影像。

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。

And then we've got one layer each

然後我們有一個層，每個層

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

我將放大自動調色層

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

然後我就稍微放大一下

by pressing Ctrl + minus or Command + minus.

按Ctrl +減號或Command +減號。

And then with that layer selected,

然後選擇該層。

I'll go up to the Image menu

我將進入影像菜單

and choose the Auto Tone command.

並選擇自動色調命令。

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 basis

在逐個管道的基礎上

and changes it to black

並將其改為黑色

and then it finds the brightest channel

然後它找到最亮的通道

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.

為每個紅、綠、藍通道。

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

結果是，我們不僅增加了對比度。

So this is before and this is after.

所以這是之前，這是之後。

But we also get rid of that green color cast

但我們也擺脫了那種綠色的色差。

that is by nature associated

自然而然地聯繫在一起的

with an old school $100 bill

用老式的百元大鈔

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。

So Auto Tone can be really useful

是以，自動音調可能真的很有用

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

如果你想擺脫偏色的問題。

But if you like the coloring of an image,

但如果你喜歡一個影像的著色。

it's going to very likely mess it up.

它很可能會把它弄亂。

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.

並在這裡把它往下移一點兒。

Make sure the layer is selected.

確保該層被選中。

And then I'll go up to the Image menu

然後我將進入影像菜單

and choose Auto Contrast.

並選擇自動對比度。

Now this command also looks at the darkest pixel

現在這個命令也是看最暗的像素

and the brightest pixel in the image,

和影像中最亮的像素。

but it does so on a composite basis.

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.

最亮的像素，並使其更亮。

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

and this is a high contrast version.

而這是一個高對比度的版本。

We do have more contrast,

我們確實有更多的對比。

so darker shadows and brighter highlights

所以陰影更暗，亮點更亮

but we have the exact same greenish color cast

但我們有完全相同的偏綠的顏色

as we did in the past.

像我們過去那樣。

All right, compare this to the most complicated

好吧，把這與最複雜的

of the auto functions, which is Auto Color.

的自動功能，也就是自動色彩。

Go ahead and Alt or Option,

去吧，用Alt或Option。

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

點擊那個人，以便放大它。

Make sure it's selected as well.

請確保它也被選中。

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。

It's going to take the darkest pixel

它將採取最黑暗的像素

on a channel-by-channel basis

在逐個管道的基礎上

and make it black and neutralize it as well

並使之成為黑色，同時中和它。

so that it doesn't have a color cast.

這樣，它就不會有偏色。

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

channel-by-channel and neutralize it.

逐個管道，中和它。

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

and make it neutral as well.

並使之成為中性。

And when I say neutral

而當我說中立時

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。

I am seeing dark neutral shadows

我看到黑暗的中性陰影

as well as bright neutral highlights.

以及明亮的中性亮點。

And so the only colors that are surviving

是以，唯一存活的顏色是

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。

And so if I were to zoom out

是以，如果我將其放大

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

按Ctrl+0或Mac上的Command+0鍵。

so that we can take in all of the bills,

這樣我們就可以接受所有的賬單。

you can see that Auto Contrast

你可以看到，自動對比度

is the one that's going to maintain the colors

是要保持顏色的人

inside of the image.

影像的內部。

Auto Tone is going to remove any color cast,

自動調色是為了消除任何偏色。

but very likely replace it with a different color cast

但很有可能用不同的顏色來代替它。

in the case of these red shadows.

在這些紅色影子的情況下。

And Auto Color is going to do its best

而Auto Color將盡其所能

to neutralize the shadows, highlights,

以中和陰影、高光。

and midtones inside your images.

在你的影像中，你可以用它來做一個 "中間色調"。

All right, so in the case of this $100 bill,

好吧，那麼在這張百元大鈔的情況下。

Auto Contrast probably does the best job.

自動對比度可能做得最好。

In the case of an actual photographic image, you never know.

在實際的攝影影像的情況下，你永遠不知道。

Now the first step in correcting the color cast

現在是糾正偏色的第一步

or if you prefer color bias of a photograph

或者如果你喜歡照片的顏色偏差

is to identify what that color cast or color bias is.

是要確定這種偏色或色彩偏差是什麼。

And so here we are looking at an underwater GoPro photo.

是以，我們在這裡看到的是一張水下GoPro照片。

No lights whatsoever.

沒有任何燈光。

Your photos don't have to be underwater.

你的照片不一定要在水下。

I just happen to have a lot of them.

我只是碰巧有很多這樣的人。

And so we can safely assume that this guy is too green.

是以，我們可以有把握地認為，這傢伙太綠了。

After all, I'm about 30 to 40 feet deep

畢竟，我大約有30到40英尺的深度

and so I've lost a lot of the color spectrum.

是以，我失去了很多的色彩光譜。

You lose the reds first, then the oranges, then yellows

你首先失去了紅色，然後是橙色，然後是黃色

and after a while, you're left with greens and blues.

而過了一段時間，你就只剩下綠色和藍色了。

But we are seeing a little orange here and there.

但我們在這裡和那裡看到一點橙色。

And even if we're pretty confident this is a greenish cast,

而且即使我們很有信心這是一個綠色的演員。

there's no sense in not checking for sure.

沒有理由不檢查一下。

And you can check exactly what the color cast is

而且你可以準確地檢查出偏色是什麼

using the Eyedropper tool

使用 "滴管 "工具

which you can get by pressing the I key.

你可以通過按I鍵獲得。

And one I've done is I've created

我所做的一件事是我創建了

a bunch of copies of this layer

該層的一堆副本

for comparative purposes later on.

以便以後進行比較。

But I also up here at the top have this shape layer,

但我也在這裡的頂部有這個形狀層。

which is a circle, which is identifying the region

它是一個圓，它正在識別區域

that I think ought to be neutral.

我認為應該是中立的。

And when I see neutral, it should be a lightish gray.

而當我看到中性時，它應該是一種淺灰色。

Whereas if I were to click inside there

而如果我點擊裡面的

and notice when I click and hold, I am seeing a color ring

並注意到當我點擊並按住時，我看到一個色環

which is showing me the old foreground color on the bottom

這是在底部向我顯示舊的前景顏色

and the new foreground color at the top.

和頂部的新前景顏色。

We can plainly see that that is a kind of green.

我們可以清楚地看到，那是一種綠色。

All right, but to confirm for sure

好的，但要確認的是

what we need to do is make sure

我們需要做的是確保

the color panel is on screen.

色板在螢幕上。

And if it's not, you can go to the Window menu

如果不是的話，你可以去窗口菜單

and choose the Color command.

並選擇顏色命令。

Of course, do not choose the command

當然，不要選擇命令

if it has a check mark in front of it,

如果它前面有一個複選標記。

and then click on the flyout menu icon

然後點擊飛出的菜單圖標

in the top right corner

在右上角

and switch to HSB Sliders

並切換到HSB滑塊

is generally the easiest way to work.

通常是最簡單的工作方式。

And that way we can see our hue, saturation,

這樣我們就可以看到我們的色調，飽和度。

and brightness values.

和亮度值。

Now all the brightness value is doing is telling us

現在，亮度值所做的就是告訴我們

that this is a pretty bright color,

這是一個相當明亮的顏色。

so it's somewhere in the mid tone to highlight range.

所以它是在中調到高調範圍內的某個地方。

That's just fine.

這就好了。

It's not anything we need to worry about.

這不是我們需要擔心的事情。

The hue value is telling us the base color in degrees

色相值是告訴我們基礎顏色的度數。

and I'll show you what that looks like in just a moment.

稍後我將向你展示它的樣子。

And then the saturation value goes from gray at 0%

然後飽和度值從0%的灰色變成了0%。

all the way to the most highly saturated version

一直到最高度飽和的版本

of that specific color at 100%.

該特定顏色的100%。

Now if this were a neutral image,

現在，如果這是個中性的影像。

if it didn't have a color cast,

如果它沒有色差的話。

then this saturation value

那麼這個飽和度值

would be somewhere in the zero to 10% range.

將是在零到10%的範圍內。

Instead, it's extremely high at 37%.

相反，它是極高的37%。

That means we have a pronounced color cast.

這意味著我們有一個明顯的色差。

All right, let's take a look at the hue value, however.

好吧，讓我們來看看色調值，然而。

172 degrees is very close to cyan.

172度非常接近於青色。

And so I'll go ahead and switch over

是以，我將繼續並切換到

to this big color chart that I've created for you.

到我為你創建的這個大的顏色圖。

And by the way, it measures 32 by 22 inches

順便說一下，它的尺寸為32×22英寸

in case you decide you want to print it out.

以防你決定要把它打印出來。

And I've gone ahead and mapped out

而且我已經提前繪製出了

all the hue values on a circle,

一個圓上的所有色相值。

starting at zero degrees for red

紅色從零度開始

and then going back all the way around to 360 degrees

然後再一路返回到360度

which would once again be red.

這將再次成為紅色。

And so the visible color spectrum,

是以，可見的彩色光譜。

at least where hue values are concerned,

至少在色相值方面是這樣。

ultimately forms a continuous circle.

最終形成一個連續的圓。

And so notice we have the industry standard colors of red

是以，注意到我們有紅色的工業標準顏色

at zero degrees, yellow at 60 degrees,

在零度時為黃色，在60度時為黃色。

green at 120 degrees, cyan at 180,

綠色為120度，青色為180度。

blue at 240, and magenta at 300 degrees.

藍色在240度，洋紅色在300度。

And again, these are industry standard colors

再說一遍，這些是行業標準的顏色

which is why I've set them in the largest type.

這就是為什麼我把它們設置為最大的類型。

In between, we have subjective colors.

在這兩者之間，我們有主觀的色彩。

Now I think we can all agree that 30 degrees is orange

現在我想我們都可以同意，30度是橙色的。

but I'm calling 90 degrees lime,

但我稱之為90度石灰。

150 degrees turquoise, and so forth.

150度的綠松石，以此類推。

Now around the outside,

現在在外面轉轉。

we're seeing the 100% saturated versions of the colors.

我們看到的是100%飽和的顏色版本。

Toward the inside, we're seeing 0% saturation.

朝裡走，我們看到的是0%的飽和度。

So everything ultimately goes to gray.

所以一切最終都歸於灰色。

Our color cast is 172 degrees

我們的色差是172度

which means we need to send it from this point over here.

這意味著我們需要從這一點上把它送過去。

Probably right about here actually.

實際上可能就在這裡。

I'll just go ahead and drag around.

我就繼續拖來拖去。

And you can see the hue values changing over there.

你可以看到那邊的色調值在變化。

So right about there is our color,

所以就在那裡是我們的顏色。

and so we need to take it

是以，我們需要把它

in absolutely the opposite direction.

在絕對相反的方向。

So we'll start by trying to correct

是以，我們將首先嚐試糾正

the color cast automatically

自動偏色

using two familiar commands, Auto Tone and Auto Color,

使用兩個熟悉的命令：自動色調和自動顏色。

both of which correct the image

兩者都能糾正影像

on a channel-by-channel basis.

在每個通道的基礎上。

And so notice if I switch over to the Channels panel,

所以請注意，如果我切換到通道面板。

we have a darkish red channel,

我們有一個暗紅色的通道。

we've got a bright cheerful green channel,

我們有一個明亮歡快的綠色通道。

and then we have a blue channel that's somewhere in between.

然後我們有一個介於兩者之間的藍色通道。

And so in other words, we have plenty for Auto Tone

是以，換句話說，我們有很多東西可以供Auto Tone使用

and Auto Color to work with.

和Auto Color來工作。

All right, I'll go ahead

好吧，我先走了

and switch back to the Layers panel.

並切換回圖層面板。

Now even though we've seen these commands before,

現在，儘管我們之前已經看到了這些命令。

they are a little bit hard to predict, as you'll see.

他們有點難以預測，你會看到。

And they'll help us to understand two other functions

而且它們將幫助我們理解另外兩個功能

that allow us to correct color cast inside Photoshop.

允許我們在Photoshop內糾正偏色。

All right, so for the sake of demonstration here

好吧，為了在這裡進行演示

I've got a control layer.

我有一個控制層。

I'm going to go ahead and turn on the auto tone layer

我將繼續前進並打開自動色調層

and click on it to select it

並點擊它來選擇它

and also make sure that neutral layer is turned on.

並確保中性層是打開的。

So I can click right there in the center of it

所以我可以在它的中心位置點擊一下

in order to lift what should be a neutral color.

以提升本應是中性的顏色。

And by the way, couple things to note here.

順便說一下，這裡有幾件事要注意。

You can move your cursor around on the fly if you like

如果你願意，你可以在飛行中移動你的遊標

and you'll see those HSB values changing

你會看到這些HSB值的變化

there in the Color panel

在顏色面板上有

in the upper right corner of the screen.

在螢幕的右上角。