## Using Image Data Other than Unsigned Chars

Typically, grey-level images are stored as unsigned chars, and KLT assumes the same. However, if this is not the case, then KLT can be modified by changing the line

> `typedef unsigned char KLT_PixelType;`

in the file `klt.h`. This has not been tested, but it should work. The only function that will no longer work properly is KLTWriteFeatureListToPPM, because the image will now contain more than eight bytes per pixel.