I was looking for some time for a plug-in that would allow me to open, edit and save WebP files directly with Photoshop instead of converting them afterwards. Sadly Adobe did not a**e up to provide one, but luckily someone else managed to write the necessary .8bi file. Here it is:
(scroll down a bit for the ready made plug-in for PS Mac and Win)
The same author wrote another .8bi plug-in for PNG files, that, among some other goodies, allows to split the PNG Alpha channel to an alpha layer in the channel palette and produces astonishingly compact PNG files on save. Grab it here:
Sadly both plug-ins wont work with CS2 on my small computer – but they work just fine with CS5 on my big computer edit:
If you own another version of Photoshop and get it up and running:
Please drop a line in the comments.