The transmission of press fax images on short-wave is based on gray levels and specific IOC values. A number of IOC assignments were modified for press image transmissions. These special characteristics are taken into account in the PRESS-FAX software.

If the Auto function is selected the software waits for the IOC identifier and synchronization sequence. Both parameters are only transmitted at the start of an image and hence capture will only start when the next image occurs. By selecting PRESS-FAX, the decoding starts immediately and the drum speed and IOC can be programmed manually via the Drum speed and IOC items in the Demodulator menu. The selected parameters are displayed in the decoder status bar.

The decoder allows a continuous and smooth alignment of the image as it is being received from Options/Fine Speed. By using the Phase item in the Options menu the image can be shifted into the correct position. Flip Left-Right and Flip Top-Down will reverse the image or turn it upside down.

To enhance the interpretation of gray-scale images, a false color option is available. Right-click on the image to opens the Zoom menu, and select a color scheme from the bottom part. A checkmark is placed to the left of the selection.