I've been using terminal to convert my jpg image named left to pvrtc format and this happens:
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool -e PVRTC --bits-per-pixel-2 -o left.pvrtc left.jpg
Failed to load image
Failed to perform Encode
Change:
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool -e PVRTC --bits-per-pixel-2 -o left.pvrtc left.jpg
To:
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool -e PVRTC --bits-per-pixel-2 -o left.pvr left.PNG
The file must be a PNG
Updated instructions on OSX 10.10+
In Terminal, hit cd to make sure you're in your root directory.
cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ && ls
This should show you a list of all the tools there (Make sure you see texturetool) - If you don't, update your OS, then Xcode
Once you know it's there, cd back to your root and run the tool like:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool -e PVRTC --bits-per-pixel-2 -f PVR -o [new path to pvr to go] [path of original png]
Your output pvr path can be ~/whatever/image.pvr and your input png is the path to your image to be converted.
HERE and HERE are other good walkthrough
The
iPhone SDKincludes a tool that allows you to create textures in the PVRTC compression format, aptly namedtexturetool. If you have Xcode installed with the iPhone OS 2.2 SDK in the default location (/Developer/Platforms/), thentexturetoolis located at:/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool.
texturetoolallows you to create four variants ofPVRTCdata, the primary difference being tradeoffs between quality and size. You will have to experiment with these variants to determine which setting is the best compromise for each individual texture image.
HERE is some same code to help once you have your pvrtc file
HERE are some more docs
HERE is a good read on PVRTC stuff
