Hue, Saturation, Value
I generally try to shy away from graphics topics I'm not to good at,
conceptually, but this tip gives such neat results I've decided to go over
it anyway. It has to do with tweaking the HSV channels of an image.
HSV? Explain Please
Note: Reading this is optional. It won't effect your ability to use this
HSV is a color model that defines colors based on their Hue, Saturation and
There's a lot of (better) ways to grasp this concept, and Kai has even
explained it, in perhaps a more lucid way. But for those of you (you know
who you are!) who don't read Kai before reading this, at least you'll have
some background in what I'm talking about. Here's a few examples:
- Hue is what the color is. This tells where along the spectrum
your color lies. This value wraps around; the extreme high value (white) and
the extreme low value (black) translate into the same value on the color
- Saturation can be loosely thought of as how pure the color is.
Greater values (more white) in the saturation channel make the color appear
stronger. Lower values (less white, tending to black) make the color appear
very washed out.
- Value is how bright the color is. White values in this channel
have the maximum brightness, black values have no brightness at all.
Important: When using Compose, you need to work with
only grayscale images. Otherwise they won't show up in the image
Hue, Saturation, and Value channels. Note that the Saturation is at the
maximum values (giving the purest colors) and the Value is at the maximum
values as well (giving the brightest colors).
The three channels Composed
Hue, Saturation, and Value channels. With the Saturation at half the maximum
values, look at what happens when the channels are Composed:
Colors appear more "washed out."
Hue, Saturation, and Value, this time with the Value set to half the maximum
value. Note that in the Composed image, it's much less bright:
The brightness is half that of our first composed image.
And the Tip
OK, so now you've seen it...you can get the spectrum just by getting a black
to white blend in the Hue channel. Well, let's try something a little more
interesting than just a straight blend:
1) Our Hue channel
As you can see, our Hue channel is very exciting, varying from a lot of
different shades of grey. This will produce a bright, colorful image. If
you're wondering how I created this Hue image, see the Cows on LSD tip.
2) Our Saturation and Value image
Since we want both the Saturation and Value to be the maximum, we use a
white image. We can use this same image for both channels; you can specify
that in the Compose dialog box.
3) The final result
And we have something super-colorful. This is not necessarily powerful by
itself, but it is a good tool to have when you need some wacky textures,
with very cool colors.
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