(Trevor) Okay, folks, so what I'm doing here
is going to show you guys Blend Modes.
Now, I have a sample image.
This is one of the two samples that
I'd given you guys up on Brightspace.
And what I'm going to do is--
First of all, I've just
turned off this layer--
this is why it probably looks
a little bit different
from what you opened right away--
so, turn that off.
Now I'm just going through Blend Modes
and show you how it works.
So, Blend Modes will alter
a selected layer
and allow certain information
in a tonal range and color range
to either be hidden or be combined
or ultimately hidden or shown,
so that you can have
a specific effect on your image.
So for this layer,
if I open up my Blend Modes
and you can find it right here
in the Layer Panel,
it'll usually say Normal.
Remember that these are split into groups.
So we have the Darken group.
So right now, this layer is going to mix
with the layer below it.
So you're going to see Darken,
Multiply, Color Burn.
So what it's doing, it's just
darkening down certain areas of one layer
and mixing with the other,
so depending on the effect
and depending on the range.
So Multiply and Darken will just darken.
Color Burn will darken
in a stronger way but it'll also apply
different aspects of color
when it's doing its thing.
We have the Lighten group,
which has the same idea,
so it's just going to Lighten.
And then we have our Overlay group
which is used more for compositing
but it does have an interesting effect
depending on how you use it.
We have Difference, Exclusion,
Subtract, Divide, the subtraction zone
and this is useful for certain aspects
in Photoshop ultimately.
And then we have the Tonal
and Color specific groups.
Now practically, for you guys, if we want
to do something interesting
like a Double Exposure in Photoshop,
that is where the "Snake" layer
comes in.
What we're going to do is just change
the Blend Mode of "Snake"
so, it'll blend with the layers below it.
So, I'm going to go down to Overlay.
Now, if you've ever seen
a "double exposure,"
this is kind of how they do it.
Now, this is applying only to the...
portrait, for two reasons--
the background is pretty much
pure white, so it's not going
to really affect that.
And I do have it mask at the same time,
so there you go.
That's why it's applying to that Mask.
So...
that is how we can mess around with
a Blend Mode for doing a Double Exposure.
Now of course we can do certain things
like, move the layer above if we want to,
or we can duplicate it and free transform.
Need to zoom out here.
Let's rotate it like this
and do something like that.
So we can do a bunch of different things
and then we can lower our layer opacity
to do any kind of texture we want
within an image, itself.
We can, of course, mask
after that if we want to.
So for example, if I don't want this
built up on my subject's eyes--
Let's go with the 50% brush.
And we'll go with the concealing brush.
There we go.
I'll have to do the same for both layers.
Cool.
So we can do something like that,
if we wanted to.
Now, another Blend Mode we can use
is something called Colors.
This is the second layer and we have
a layer already created for you guys
called "Color," so if I wanted to,
say, create a color.
So let's go 10, 30, 40.
So this is basically just the CMYK value
for "perfect Caucasian skin."
Now again, this won't look realistic
because nobody has
those exact numbers all over
but if I start painting over
the person's skin--
now my brush opacity is low--
you're going to see
that it's just a solid mass.
This is where Blend Modes
are going to come in.
If I change my Blend Mode
on this color layer to Color,
which is at the bottom,
you'll see what will happen is,
it's going to allow the tonality
to come through the layer.
Now you'll also notice that
if I paint on the background
because there's no information,
it will not blend through.
So there you go.
This is how Blend Modes work.
This allows us to change
the color of something if we want to
or do something creative.
Now once upon a time with Blend Modes,
you used to have to use Blend Modes
to do a lot of the functions
you actually do in Photoshop.
So if I wanted to lighten an image,
I'd have to use a Blend Mode.
If I wanted to darken an image,
so on, so forth.
So there wasn't a lot of flexibility
in Photoshop, once upon a time.
Now the benefit of Photoshop
evolving over time
is now these features are evolving
into different things.
So we use curves and what not
in adjustment layers.
Now I still use Blend Modes.
I use Blend Modes for this
exact function that I'm doing right now,
depending on what I'm doing.
But the one I use the most is Luminosity
as it will only affect tone.
Okay, now to give you an example of that,
if I add an adjustment layer,
and I do something very drastic,
so let's just get rid of that.
And there we go.
You'll see that it's affecting
the color of her skin.
She now looks like a very orange color.
If I change this Blend Mode to Luminosity,
it will just affect the tone 
and not so much the color.
So if I just step back and move forward,
so I'm just changing my Blend Mode
back to normal and back to Luminosity.
This is the one I use the most,
so if you guys want to make
an adjustment layer that is quite strong
because contrast and you find it
doing weird things with your color,
you guys can use Luminosity.
So there you go, folks,
that is how we use Blend Modes
and some creative things
you guys can use Blend Modes for.
