Forum: Photoshop


Subject: Alpha Channel Help

Sking opened this issue on Feb 14, 2001 ยท 4 posts


Sking posted Wed, 14 February 2001 at 12:54 AM

I have loaded an image that was rendered in bryce into photoshop. Im am trying to create a depth of field look. Also in bryce i did a distance render. How do i place the distant render image into the alpha channel of the perspective image (first bryce render). Next it says load the alpha chennel as a selection. Is there anybody out there than help me. A step by step walkthrough would awesome. Many thanks in advance.


Jim Burton posted Wed, 14 February 2001 at 1:18 PM

I assume the distance render is a seperate, grayscale image? Assuming they are the same size, open the Channel palette for the color image, click on the new channel button at the bottom of the palette (3rd button), Go to the Distance image, select all, copy and paste into this channel. The fist button at the bottom of the channel palette then loads the channel as a selection. The final step would probably be use Filter, Blur, Gausian Blur to blur an amount that looked correct.


Sking posted Wed, 14 February 2001 at 3:00 PM

Hi Jim Yes the distant render is greyscale image that was rendered in byrce and is the same size as the original image. Thanks for this jim - you have been a huge help, and i have learn't something. Thanks


DigitalDream#3 posted Wed, 14 February 2001 at 11:05 PM

Okay, my turn. Same thing I think though!. Do a normal perspective render.2. Do a distance render.3. Save them in both the same place.4.Open both files in PhotoShop.Copy and paste the distance mask into a new layer in the channnel palette of the perspective render.Load that channel as a selection and apply Gaussian Blur. This is pretty much straight from the handbook that came with the software.