[New Quartz Composition] RGB Channels Tint and Saturation

Jean-Jacques Boutaud
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Postby Jean-Jacques Boutaud » April 21st, 2011, 7:35 am

Hi all
I've created a new Quartz composition: RGB Channels Tint and Saturation.
Using this composition, one can adjust separately tint and saturation for each RGB channel (red, green and blue):

An example:
Image
(original image at left and edited one at right (made with a little help from BC_Layers))

Controls with default values (identity values)
Image

How does it work?
#1. An image with full red, full green, full blue and white (full red+full green+full blue=white) squares:
Image

#2 Desaturating one channel (here red one)
Image

#3 From Red to Yellow (red+green=yellow)
Image

#4 From Red to Magenta (red+blue=magenta)
Image

Of course, other channels work the same way:
- you can tint green channel from yellow (red+green) to cyan (blue+green)
- you may tint blue channel from cyan (green+blue) to magenta (red+blue)

A "real world" example?
Some green/yellow leaves:
Image

Two different results:
Image

Image

Hope that you'll find this useful.
JJBee, Président (à vie) du G.R.O.I.N.
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uncle808us
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Postby uncle808us » April 21st, 2011, 3:19 pm

Thank you very much this will come in handy.
Jean-Jacques Boutaud
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Postby Jean-Jacques Boutaud » May 1st, 2011, 4:34 am

Hi uncle808us
I'm working on a new version, adding a Brightness control for each RGB channel.
JJBee, Président (à vie) du G.R.O.I.N.
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uncle808us
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Postby uncle808us » May 1st, 2011, 12:34 pm

That will be a good addition. Thanks
Erin
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Location: Toronto, Canada

Postby Erin » May 15th, 2011, 9:34 pm

Sorry to ask such a simple question, but I haven't had a chance to learn a lot about Image Tricks. I came across the 'sketch' quartz file Jeans-Jacques, and I was just looking for a way to produce that effect in Photoshop the other day.
So, now that I have the file, where do I put it?

Thanks,
Erin
P.S. Hi Bob, see you back at Cheetah ;)
Jean-Jacques Boutaud
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Posts: 1640
Joined: July 10th, 2006, 2:29 pm
Location: France
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Postby Jean-Jacques Boutaud » May 16th, 2011, 1:38 am

Hi Erin
This effect is a Quartz composition (its file extension is .qtz) and, once unzipped, has to be moved to:
/Library/Compositions/ (compositions available to all users of a computer)
or
~/Library/Compositions/ (compositions available to a specific user)
Create yourself this folder if it doesn't already exist.
A few other effects from BeLight Community are Image Units (their file extension is .plugin, e.g. BC_CustomColorize.plugin). They have to move in:
/Library/Graphics/Image Units/
or
/Library/Graphics/Image Units/
JJBee, Président (à vie) du G.R.O.I.N.
Secrétaire général : iMac C2D 2.16GHz
Secrétaire adjoint : MacBook Pro 17" Unibody 3.06GHz
http://belightcommunity.free.fr/BeLight Community website
Erin
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Joined: January 29th, 2009, 2:58 pm
Location: Toronto, Canada

Postby Erin » May 16th, 2011, 9:20 am

Thank you so much Jean-Jacques

Your stuff is great!

Erin
uncle808us
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Postby uncle808us » May 16th, 2011, 3:17 pm

Erin wrote:Sorry to ask such a simple question, but I haven't had a chance to learn a lot about Image Tricks. I came across the 'sketch' quartz file Jeans-Jacques, and I was just looking for a way to produce that effect in Photoshop the other day.
So, now that I have the file, where do I put it?

Thanks,
Erin
P.S. Hi Bob, see you back at Cheetah ;)

Hi Erin!

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