Go Back   RetouchPRO > Technique > RP Tutorials
Register Blogs FAQ Site Nav Search Today's Posts Mark Forums Read

RP Tutorials Discussion for tutorials published via our automated system, and about the tutorial publishing system itself.

I'd like a tutorial on Gradiated (sp?) alpha channels.

Thread Tools
Old 12-27-2003, 10:36 PM
pixeltickler's Avatar
pixeltickler pixeltickler is offline
Junior Member
Join Date: Jul 2003
Location: Portland OR
Posts: 14
I'd like a tutorial on Gradiated (sp?) alpha channels.

I'd like a tutorial on Gradiated (sp?) alpha channels, like the one Jim Johnston did for his Glamour puss retouch (#12). I know Jim gave a description of what he did, but I guess I'm either too dense or too inexperienced to make heads or tails of his directions. So is anyone out there up to making a tut on how to make that kind of alpha channel? OH and while I'm thinking of it. Maybe one on making masks/alpha channels when the background it is two-hued. All the tuts I've come across assume your background that you are masking off is all the same but what if it's not? What if it's both black and tan? Then what do you do?

Thanks in advance,
Reply With Quote top
Old 12-27-2003, 11:28 PM
roger_ele's Avatar
roger_ele roger_ele is offline
Senior Member
Join Date: Oct 2002
Location: Sacramento, California
Posts: 620

I am replying for the opportunity to learn something and to show my ignorance ...

My understanding of all channels is that they are greyscale images. Red is a grey channel, blue and green also, for each layer. A layer mask is a grey channel attached to that layer only. Alpha channels are a storage device for those greyscale images that are not attached to anything. They can be used to create a selection and then create a mask from the selection, or in Apply Image or Calculations and I am sure in other ways ...

To create a gradiated Alpha mask i guess you would (I havn't done this before) create a layer or a mask, fill the layer or mask with a gradation with the gradation tool, Select the luminosity of that layer or that mask, save your selection as an alpha channel. Or maybe you can just create a new channel in the channels window and paint a gradation on the image???

If you had multiple colors the do different things you would need a channel for each seperateley if you wanted to affect the things they did seperately, or create a selection based on the combined colors and save that selection as an alpha channel.

I am sure I got part of this right, and for any I got wrong we will all learn double
Reply With Quote top

  RetouchPRO > Technique > RP Tutorials

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tutorial 05: Converting a Color Image to Black and White grayscale BW DannyRaphael Photo-Art 101 17 05-22-2011 04:55 PM
How can you combine multple alpha channels into a single mask? beestripe Photo Compositing 6 10-03-2007 09:30 AM
An interesting link... Frank Lopes Non-RetouchPRO Resources 3 05-26-2006 06:23 PM
[Definition] Alpha Channel Doug Nelson Photo Retouching 4 08-08-2005 08:37 AM
Need tutorial for masks and channels Doug Nelson RP Tutorials 3 03-15-2002 07:10 PM

All times are GMT -6. The time now is 07:51 AM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Copyright © 2016 Doug Nelson. All Rights Reserved