jpg > tiff conversion

[anthony]

Look at IM Examples, TIFF format.
http://www.imagemagick.org/Usage/formats/#tiff

TIFF is a horrible file format that is ill-defined, and no application reads all its internal format styles. You will need to figure out what internal formating you need for your application to read the result.

You are better off using some other properly defined format for your images. (Yes I am biased, and with good reason. Every time I used TIFF, I was hit by this incompatibility problem. It seems to be a similar fault that is developing in the '.avi' video format with its hundreds of encoding styles.