LAB Mode Vs RGB Mode: Photoshop CS6

LAB Mode Vs RGB Mode: Photoshop CS6

August 13, 2019 28 By Peter Engel


Aaron: Today I’m going to show you how to
edit colors like a boss using LAB mode. Hey guys! Welcome to PHLEARN. My name is Aaron
Nace. You can find me on Twitter @aknacer. Today we are taking one of the big topics
of Photoshop, color mode and demystifying. I’m going to show you guys some of the amazing
things you can do with LAB mode versus RGB Mode. We’re editing Cherd Isaac’s image
and he won last week’s contest on PHLEARN. You want to PHLEARN Pro, as well as getting
your image edited on PHLEARN. If you guys want to have your image edited on PHLEARN
as well as win some awesome prizes, make sure to enter our contest as we announce a huge
one today with some of our amazing prizes. Check out more details down below.
All right, let’s get into this because we got a lot to do. When you first open an image
on Photoshop, you’re usually going to see the RGB and eight up here. We have Untitled
one, this is your zoom level and this is RGB, which is the color space or the color mode
rather. Then we have 8, which is 8 bit. Now 8 bit is what I edit most of my images in,
and for the most part I do edit in RGB as well. The majority of the work that I do is
in RGB, but every now and then when you really want to do some work with your colors, it’s
great to flip it into LAB mode. I’m just kind of show you what’s going with RGB and
then we’ll show you guys something similar in LAB mode. Okay. Here we have our background
image and I love it. It’s just an awesome shot and it’s perfect for this tutorial.
What we’re going to do now is we’re going to create a new adjustment layer and I’m
going up to curve. A lot of the color editing that I do in Photoshop is in curve. Let’s
go ahead and full screen that. You can see with your curve adjustment layer … let’s
just try this …Here we go. You have your RGB right over here and then you have you
Red, Green and Blue. RGB stands for Red, Green, and Blue. Now if you go into your different
color channels, you can start actually moving these curves to produce different results
in your images. You can see you are able to change colors relatively easily. If you want
to reset, you can just go right ahead and hit that reset button. Let’s go to our red
channel and start seeing, maybe if we’d lower the red … Red and cyan are opposite.
If you lower the red, you’re going to put more cyan in your image. If you up the red,
you’re going to be putting more red in your image.
You’re going to see pretty quickly though, if you start messing around too much with
these colors, you’re going to start to see something that doesn’t look natural at all.
Let’s go into our green channel, and I’ll kind of show you guys what I’m talking about
there. You do get a nice color change in your image. I mean we can see here the colors are
completely (chuckles) changed. It don’t look like the original colors at all; we can
see that pretty easily. It doesn’t look like … it doesn’t look good, basically
(chuckles). It looks like you’ve messed your image up. The reason is because in RGB
mode, the different color channels actually combine to create the lightness as well. Red,
green, and blue — combine those three together create the lightness and the darkness. In
editing each of those different channels, you are actually bringing up brightness and
darkness in different parts of your image as well. You’re going to wind up in something
basically that looks like this if you start messing around too much. Not perfect for LAB.
Let’s just go ahead and full screen that out, hit full screen icon to do that. I’m
going to make this invisible and I’m going to right click on my background layer and
go to duplicate layer. We’re going to hit document and over here I’m going to go to
new. Okay, so now we have a new document. It’s basically just a copy of the other
one. What we’re going to do is go to image, down the mode, and I’m going to change this
from RGB to LAB. All right, now it’s not lab, I know it looks like LAB but it stands
for Lightness, A and B channels, three separate channels. It looks exactly same as the other
image. So far it’s like, “Okay, well, what’s
the big deal here?” Now when you start to edit using curves or any kind of hue saturations,
you’re going to see that instead of working with the RGB channels, you’re working with
LAB, which separates out lightness from your colors, so you can do anything you want to
your colors while keeping the light level the same. It gives you a lot more flexibility
especially when you’re trying to do something like this. Again, let’s do the same thing.
This is with LAB. We are going to go over here to our curve. Now what we’re going
to see is, instead of RGB, we see lightness, we’re seeing A and we’re seeing B. Now
if you change your lightness, it’s going to do again. Just change just how light or
how dark something is but it’s going to leave the color completely alone. If you go
to your A channel, you’re going to see this is starting to mess with colors and it can
be a little bit confusing, so if you don’t get this right away, don’t worry about it.
It’s a little advance, but the best thing to do is just go to your A channel, go to
your B channel and start playing around. That’s the best thing to do. I’m going to click
right here in the middle and start pulling down and we can see this is pulling more cyan
into my image. If I go up it’s going to put a little bit more magentas into my image.
Okay? Let’s go to our B channel and look what
that’s doing. Now the B channel: if we click and drag up, it’s going to add more yellow.
If we click and drag down it’s going to add more Blue. So far not a huge difference
from RGB, but now if we start actually play around with these and really start to push
and pull them, you can see we’re able to edit colors very, very far but keep the lightness
the same. You’re able to get crazy color adjustment on your image but it still looks
like it has a dynamic range of the original photo, even if you’re doing absolutely insane
things with your colors. I mean we’re getting nice red and yellow in our highlights now.
Just a crazy amount of variation from the original but it still looks like it should,
basically. It just looks like maybe you are really more creative with your gel. Now, compare
that to something like this and you can pretty quickly see that using LAB mode to change
your colors really can give you some of great advantages.
We’re going to use a couple of variations. Let’s just grab another curve adjustment
layer and you can do really whatever you want here. I would leave the lightness pretty much
alone, but your A and B channel, if you want to click and drag from the left to the right…there
we go, on your input and output sliders, you can choose to kind of lower the dynamic range
of your A channel, which is going to give you a certain type of look. You can also click
the high point and the low point and bring those up together, which is going to give
you more of a de-saturated look, depending on how far you go and you can see that there
look a little bit more de-saturated. Whatever you really like to do is (chuckles), it sounds
so imperfect. It’s like “oh, I like to do this, I like to do that”. Really what
you are doing is changing your colors around, there’s no right or wrong at all, it’s
totally preference at this point. This is not for preserving skin tones, by the way.
This is … obviously, that does not look right. You can still get some pretty close.
If you do pull one side of the curve up and it’s just way too much, grab the other side.
If you split this down the middle and you have your left side and your right side, grab
your right side and start dragging that down to create basically like a contrast and you
start to even things out a little bit more. You can have a negative contrast or you can
have positive contrast. Either way you want to do it, but again it’s
working with color here, not with lightness. All right, let’s go to our B channel and
we can do basically the same thing. Let’s drag that down and drag this guy up here again.
All right, here we go. Let’s say, “You know what, I like the green inner skin. If
I pull this down too much we can get more blue inner skin, I like that green inner skin.”
Let’s go back to our A channel and you can start to adjust things from there. It’s
kind of like a back and forth thing. Don’t expect it to just click and drag it to the
perfect place every single time, it’s going to take a little bit of kind of pushing and
pulling and seeing what you like. Alright. Even something like that is kind of cool.
For me, it’s just little bit too much but you can kind of see the power of using the
A channel and the B channel instead of RGB. All right. Now it looks very cool. Now, you
can see the difference between these images…that one is a little bit more on the Blue side,
this is one on the green side but we’re using complimentary colors, as well. We got
green on the background and then ged in her skin. You can also combine them together to
create different effects, again it kind of lower the capacity and get something that’s
maybe a little bit more closer to the original but still a little bit of color variation
in there. Let’s do one more and we’re going to call it. All right, let’s go back
to our B channel and I just want to bring this guy in at a lot Yellow and then we’re
going to put a little bit more Blue in the background. If you guys want a little extra
bonus points this is actually really cool. Let’s just reset that. Instead of actually
clicking and dragging around here because that can be a little bit confusing, let’s
go to our A channel and grab this little hand tool right here … it’s got a hand with
up and down arrow. You can actually click anywhere on your image and drag up or down
and it’s going to put either more Cyan or Magenta if you’re in the Blue channel, or
Yellow and Blue if you’re in the B channel. All right. I said the Blue channel but I meant
the A channel. There we go. Let’s click and drag that up and kind of even this out,
maybe we’ll get a little bit more…there we go. Let’s go back to our B channel, I
think I want that little bit of Yellow in my skin and maybe a little bit more Blue in
my highlights. By using this little arrow here, I’m able to just click the different
areas that I want and define what I actually want to be visible or not visible in that
part of the image. It uses the specific color range of that image to get there. All right,
maybe a little less blue here in the highlights. There we go and let’s put a little bit less
green in there, as well. Or maybe more of Green, I kind of like that and then here on
the lips let’s just really bring that up. This is not local in the way that it’s not
going to select out the lip. It selects out that specific color range that is similar
to the lip. It’s not just like selecting the area I’m clicking. It just happens to
be that’s color range. If it happens to be light or dark or different color ranges
within the area where you’re clicking, not necessarily around the cursor, that can be
a little bit confusing. We can see there a huge color adjustment, and we’ve got something
that is really, really dynamic. I know that it’s not super natural. It’s actually
super natural. It’s not actual natural. Let’s just grab this and put a little more
blues to her skin. Here we go. Very, very cool effect. All the while, we’re maintaining
the same lightness as we had before, and you can combine this effect in very interesting
ways. There we go. I actually like that. I think that’s really, really cool.
We have the Before and After for this. If you’re using curve, you’re going to see
very quickly you’re going to wind up with something that changes your light level. Using
LAB is a great way to actually get those curves on. Now when you’re done with LAB, all you
have to do is create a stamp visible layer. Hit Shift – Option – Command – E, which
creates a stamp visible layer. Then what I do is I just bring this right in to my RGB.
So stamp visible layer, hold down shift and with your move tool, just click and drag.
Here we go. Let’s get rid of that guy. So now, we’re back in our RGB channel. We’re
editing just like normal again. We have our other image. You can start editing just like
you would normally edit right back again. That’s it for today’s episode. Thanks
so much for watching! I hope you enjoy using LAB. If you guys tried this out and you did
some crazy work using colors, please submit it in the comment down below. I would love
to see it. It works the best when you really do have lots of crazy colors in your image.
Thanks so much for watching guys! I’ll return later. Bye everyone!