Alpha Texture via Alpha Cheannels in PS

Discussion in 'Graphics Programs and Photo Gallery' started by zpfriem, Feb 28, 2004.

  1. zpfriem

    zpfriem TPF Noob!

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    Okay,

    I am totally new to Photography, but when it comes to Photoshop, I may be able to contribute a bit...

    Alpha Channels deal with contrast and lighting. They enable you to add texture and 3d surfacing to images or graphics.

    The first exercise will be to grasp the idea of these channels.

    1.) Create a new grayscale image in photoshop (PS) and use your shape tool to make a circle, doesn't matter the color.

    2.) Go into the layer style of the newly formed shape and turn on the gradient overlay. change the style to radial. you can change the gradient to a srip effect if you want, this is what i am going to do in my example, gives more of an effect. make sure that the white is on the outside of the gradient.

    3.) Flatten your image.

    4.) Select all and copy.

    5.) Create a new image, one that's mode is RGB. The same size as the previous image with the circle.

    6.) Create a new layer and use the paint bucket to make it any color you wish, preferably a vivid color.

    7.) In the Channels window, there should be three channels, Red, Green, Blue, in the botom of the window there should be a little icon that creates a new cjhannel, this is an alpha channel, create a new one and paste the circle from the first image into this alpha channel.

    8.) Go back to your layers menu, and select the layer that you painted with your favorite color.

    9.) Here is where your hard work pays off. Go to your filters menu, render, lighting effects.

    10.) select the light to be directional, and at the bottom of the screen there is a drop down that says texture channel, pick alpha1, it should now reflect from the contrast of your circle like the image below.

    tada...
    [​IMG]
     
  2. zpfriem

    zpfriem TPF Noob!

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    the image on the left i inverted before copying to the alpha channel of the one on the right.
     
  3. zpfriem

    zpfriem TPF Noob!

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    Now, this can be used with photos as well, instead of pasting the cicle into the aplpha channel, try using your magic wand tool to select a bunch of regions in your photo and then paste them into your aplpha channel and lighten it that way, try this with clouds esspecially, or if you want something to appear decaying or crumbling like a statue or oxidation.

    [​IMG]
     
  4. zpfriem

    zpfriem TPF Noob!

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    here is one that uses a face, notice the texturing on the face...
    [​IMG]
     
  5. vonnagy

    vonnagy have kiwi, will travel...

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    I can't seem to see your pics here :scratch:
     
  6. zpfriem

    zpfriem TPF Noob!

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    okay fixed it, they were in a private folder, sorry :)
     
  7. vonnagy

    vonnagy have kiwi, will travel...

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  8. Chase

    Chase I am now benign! Staff Member Supporting Member

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    Strange, they are all showing up fine for me now...although they weren't before.
     
  9. zpfriem

    zpfriem TPF Noob!

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    well, i changed the server...lets see if they stay...and for your patience, heres another...

    [​IMG]
     
  10. vonnagy

    vonnagy have kiwi, will travel...

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    victory! :cheer:
     

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