How to convert an image to PVRTC format? (PVR or KTX file)

With TexturePacker's --convert-texture command line option you can easily convert a single image to a different format:

TexturePacker --convert-texture input.png \
              --pixel-format PVRTCII_4BPP --texture-format pvr3

The pixel format specifies the compression algorithm to use, the texture format describes the file container. The following formats are supported for PVRTC compression:

Pixel format	Bits per pixel	Description
`PVRTCI_2BPP_RGBA`	2	PVRTC compression, 2bit per pixel
`PVRTCI_4BPP_RGBA`	4	PVRTC compression, 4bit per pixel
`PVRTCI_2BPP_RGB`	2	PVRTC compression, 2bit per pixel, no transparency
`PVRTCI_4BPP_RGB`	4	PVRTC compression, 4bit per pixel, no transparency
`PVRTCII_2BPP`	2	PVRTC2 compression, 2bit per pixel
`PVRTCII_4BPP`	4	PVRTC2 compression, 4bit per pixel

Texture Format	Description
`pvr3`	PowerVR Texture Format. Native format for iOS and PowerVR GPUs.
`pvr3gz`	PowerVR Texture Format, compressed with gzip. Smaller on disk, decompressed at load time.
`pvr3ccz`	PowerVR Texture Format, compressed with zlib, cocos2d header.
`ktx`	Khronos Texture. Standard container for OpenGL ES textures.
`ktx2`	Khronos Texture (Version 2). Newer format with Basis Universal support.
`zktx`	Khronos Texture (gzip compressed). KTX file compressed for smaller storage.

The Image quality can be configured with --pvr-quality <0-7>, default value is 3.
For other options (scaling, trimming transparency, ...) have a look at the Image conversion documentation.