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Subject: Alpha Channels


Robo2010 ( ) posted Fri, 28 May 2004 at 9:08 PM · edited Thu, 01 August 2024 at 1:51 PM

I dunno, but I am really having trouble grasping this Channel Stuff and it is prob so simple. Is their any tutorials on Alpha Channels.


retrocity ( ) posted Fri, 28 May 2004 at 9:49 PM

Channels are a wild topic to grasp! what do you wanna' know?

i'm sure a search on Google will pull up a few tuts but if you've something specific that is eluding you, pop the question and we'll see what we can come up with...

i know for me, i work in Channels for specific reasons (a lot of it having to do with it being the only way to achieve stuff before LAYERS!!), but my knowledge may not be useful to you if you're in need of knowing how Alpha Channels in PS interact with Poser... (there, i'm clueless... unless i just reiterate stuff Hoofdcommissaris says ;))

let us know...
:)
retrocity


Robo2010 ( ) posted Fri, 28 May 2004 at 9:57 PM

RGB channels and Black/White. Does that help? This channeling stuff is really confusing to me. So, I really do not know what to give.


Robo2010 ( ) posted Sat, 29 May 2004 at 1:16 PM · edited Sat, 29 May 2004 at 1:20 PM

Attached Link: http://www.idigitalemotion.com/tutorials/chrome.html

Well, I did look on the net and found this good little tutorial. What I am looking for, to help slowly on Channels, and what they do. Only problem, that is the easiest I can not figure out, is Layers. How to create a Layer. How do you make a layer?

Message edited on: 05/29/2004 13:20


Boxx ( ) posted Sat, 29 May 2004 at 10:58 PM

Channels are actually very simple. A gray scale image has 256 shades of grey, from black through to white. If you look at a grayscale image in the channels you will see you only have a single channel. In RGB, you effectively have three grayscale channels, but each shows the amount of it's respective colour (Red, Green and Blue) - the combination of these three channels makes up the composite image. Similarly, CMYK uses four channels. You can also make up further ones to create selections and masks. If you want to see how it works, go to channels and select, say, the red channel, then open a second window showing the composite image. try erasing or painting on the red channel and observe how it affects the composite. Not easy to get this concept across in a few words, but I hope this helps.


Boxx ( ) posted Sat, 29 May 2004 at 11:01 PM

I just noticed your question on layers too. Maybe I should start teaching! hehe To create a layer, click the little page shaped icon at the bottom of the layer palette, or click ctrl-J From there you can add what you like to that layer without affecting the others. Layers are viewed from the top of the palette downwards, and you can switch them on or off using the little eye icon to the left of each layer.


Robo2010 ( ) posted Sun, 30 May 2004 at 11:33 AM

Thanx Boxx. With that URL tutorial I listed. I am unable to get past #1. That is unbelieveable. I feel so air headed trying to full my mind, how to do this. So, in all, trying to understand Alpha Channels. I get the idea now what they are, just how to get the hang of it. :-)


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