[A screenshot of Gempa running on Mac OS X]

The Gempa software is a standalone software developed for digital image processing of electron micrographs. Gempa is written in the IDL programming language. To use Gempa an installation of the license-free IDL virtual machine is required. IDL supported platforms are Apple Mac OS X 10.x, Intel x86 LinuX, Solaris, Microsoft Windows 7 and XP.

The Gempa feature list contains:

• import of various image formats (Tietz .tvips, Digital Micrograph .dm3, Emispec .ser, MRC .mrc, FUJI image plate data, tif, gif, png and binary data)
• export to Tietz .tvips, MRC .mrc, tif, gif, png, ppm, raw binary format
• group context: images can be grouped and commands can be performed on these groups, 3D data can be loaded as image groups
• supports various data types and arithmetics from integer to complex floating point data
• contrast manipulation
• FFT operations
• geometric transformations (image rotation, scaling, cropping, mirroring, recentering)
• image normalization
• arious complex data type operations
• unary and binary arithmetic image operations
• profile extraction in cartesian or polar coordinates
• measuring and peak fitting operations
• region of interest statistics

  Author: Lothar Houben