Ok, in Photoshop this is really simple — much easier than in Paintshop Pro for the most part.
In this example I’m starting with an image of a snowflake (or whatever) that I’ve selected (with magic wand or manually) and “Copy” it to clipboard.
1) Select “New” image in PS. It should use the image size from the clipboard. Make sure the background is “transparent”.
2) Paste into the new image as a new layer. You should now see a snowflake (or whatever you have) on a transparent background (shown by the checkerboard in PS)
3) Use “canvas size” to make the image square by increasing the smaller of width or height to match the larger value. (For instance if it’s 400w x 430h, make it 430w x 430h)
4) Now “image size” to resize to a power of 2: 128, 256, 512. Always resize down for best quality.
5) Now we just need to make the shadow. Duplicate the layer. Select the bottom layer, and select “image – adjustments – exposure”. Slide the exposure slider left to blacken the layer. Now use Gaussian blur on the layer to soften it up. Maybe a radius of 13 or so.
That’s it for creating the shadow, although you may want to reduce the opacity of the shadow layer a little, or offset the position of the shadow layer a little (but only if all of the particles will be in the same orientation)
6) Save as PNG.
Importing into particleIllusion
A) Once you select the image file and you get the shape import options dialog, don’t change any options except click “full-color”, then OK to import.
That’s it. Maybe there’s an easier way to make a drop shadow, but I’m not a PS expert.
Alan.
http://www.wondertouch.com