- [Instructor] In this movie, I'll introduce you
to the best colorization function there is,
and it's called Gradient Map.
And while that might sound like a weird name, it's accurate,
because what it does is it allows you to map a gradient
across the luminous levels inside of an image.
So whereas this image contains,
essentially, one color, which is that sepia,
this image contains a total of three colors,
that is to say reds inside the shadows,
cyans across the mid-tones, and blue across the highlights.
And that's only possible using gradient map.
So I'm going to go ahead and switch over
to my custom black and white portrait,
and I'll turn on the brightness contrast layer,
just to finish off the effect,
and I'll go ahead and select that layer as well,
and then what you want to do is go up to the Window menu,
and choose Adjustments to bring up your Adjustments Panel,
and then notice this very last icon,
the one that looks like a gradient.
It represents Gradient Map, at which point,
go ahead and Alt click on it, or Option click,
to force the display of the new layer dialog box,
and let's go ahead and name this guy Infusion,
and then I'll click Okay.
All right, now notice by default,
Photoshop goes ahead and selects the default gradient,
which is black to white,
and so what we're doing is we're mapping everything
that's black inside the image to black inside the gradient,
and everything that's white inside the image,
to white inside the gradient.
So we're not making much of a difference at this point.
Notice if I turn a layer off,
it just gets a little brighter, or at least lower contrast,
and then when I turn the layer back on,
that increases the contrast,
and that's because of the Gaussian distribution
of the black to white gradient.
In other words, it starts slowly,
moves relatively quickly through the middle,
and ends slowly as well.
But of course, you can modify this gradient,
and one way to do so is to click
on the gradient ramp right here,
and that'll bring up the Gradient Editor dialog box,
at which point you can drop down below this ramp and click,
in order to add a color stop.
And I'm going to change this location value right there to 50%,
and then you can either double-click on a color stop,
or just click on this color swatch
to bring up the Color Picker dialog box,
and I'll go ahead and change the hue value,
let's say, to 210.
I'll take the saturation value up to 20% to start with,
and then I'll set the brightness value to 50%,
so that we're not darkening the heck out of the image,
and then if you feel like that's
a little bit too much color,
you can nudge the saturation value down,
and then just click Okay to accept that change.
And if you like you can go ahead and add this gradient
to your presets, and you do that in a strange way.
You don't click on the Save button.
Instead, you click on New,
but first you need to name the gradient,
because otherwise you'll create a new unnamed gradient.
So go ahead and give it a name, such as Map to Blue,
let's say, and then click on the New button
to add that gradient to your list of presets,
and that way you can come back to it anytime you like,
just by clicking on it.
Then click Okay in order to apply that change.
So that's one way to work.
The other way is to select one of the presets
that ship along with Photoshop,
and you can get to them by clicking
on this down-pointing arrowhead,
and that'll reveal this list of presets.
You can also load others by clicking on the gear icon,
and choosing something like, let's say, Photographic Toning,
and presumably you don't want
to overwrite your current gradients,
so just go ahead and click on the Append button
to add all these guys, and notice, at this point,
you'll have a ton of different gradients to work with,
all of which are specifically designed
to work with the Gradient Map feature.
And that is specifically the advantage of working
with this Photographic Toning library.
And so feel free to give those a try,
and don't forget about your blend modes.
You can engage them as well.
So, for example, if you like a color scheme,
but you don't like the way
the luminous levels are mapping out,
then just go ahead and change
the blend mode from normal to color,
and then you'll respect
the original luminous levels inside your image.
You can even experiment with a contrast mode,
such as Overlay, or Soft Light,
and so I'm just going to go ahead and choose Soft Light there,
and then I'll press the Escape key
to deactivate the blend mode,
and I'll press the 5 key to reduce the opacity value to 50%,
in order to produce this more organic effect here.
Now, one more note, I'm going to go ahead and click
on this color ramp in order to open
the Gradient Editor dialog box.
It's tempting to think of this as being a quadtone
because it includes so many color stops, but notice,
if I were to switch to something like purple to orange,
right here, it just has two color stops,
so in a way you could call this a duotone,
but if you were to print this image to CMYK,
then you'd be using four inks:
cyan, magenta, yellow, and black,
and so technically, you would have yourself a quadtone,
regardless of how many color stops
you find inside of a gradient.
And so, I'll just go ahead and accept this guy
by clicking Okay, and then hiding the Properties Panel.
And that's how you work with the best of the best
colorization functions, Gradient Map, here inside Photoshop.