Does anyone know a way to call the LibTIFF readRawStrip function using a Matlab TIFF object?

I am working with large TIFF files and using Matlab to modify portions of them. I am reading by strips using readEncodedStrip (and writing with writeEncodedStrip), but it is very slow. For speed, I would like to use readRawStrip & writeRawStrip to copy the portions of the TIFF file that I do not need to modify. The TIFF object implements most of the LibTIFF library, but doesn't expose the readRawStrip or writeRawStrip methods. Does anyone know a way to access them? Thanks!