maybe this is just me, but when i want an image with transparency, i can't just alter the opacity in photoshop and save it as a .png ... I have to manually alter the Alpha channel. Here's what i do:
- create your image, it must be an opaque image, with no added transparency (if you do, these colours will just end up as if they have a white background behind them, ie. pale)
- Add an alpha channel, nice n easy!
- Next you have to adapt the alpha channel in order to tell coldstone which parts to make transparent... Think of it as another layer. In the alpha channel, black will make your image totally invisible, white makes it opaque and the various shades of grey inbetween determine how translucent specific part of the image will be... am i making sense?
This will not affect the image untill you run the game, but in-game it works beautifully. One technique i use often is to just paste an inverted copy of the image into the alpha channel, this way you get an image with dark opaque areas and light, transluscent areas, it looks nice 
You can often animate things purely by altering the alpha channel (especialy when creating explosions, flashes etc) and you can also use this method to makea pure opaque white show up in the game.
Hope this helps!
Migraine
ps: make sure the "discard alpha channels" box is unchecked when you save!
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