Action Convert Mode

Mode

Phatch supports the following image modes:

• Monochrome (1-bit pixels, black and white)
• Grayscale (8-bit pixels, black and white)
• RGB (3x8-bit pixels, true colour)
• RGBA (4x8-bit pixels, RGB with transparency mask)
• CMYK (4x8-bit pixels, colour separation)
• P (8-bit pixels, mapped using a colour palette)
• YCbCr (3x8-bit pixels, colour video format)
• I (32-bit integer pixels)
• F (32-bit floating point pixels)

So you can use Phath to convert from and to CMYK images if you are working with Gimp on Linux.