Operating under low-memory conditions

There are several ways to increase available memory:

1. In the ``Config'' menu, turn off the ``Automatic undo'' option before loading any images. This will double the amount of space available for images, but tnimage will not create an ``undo'' buffer for each image and it will not be possible to undo any changes to an image.

2. Start tnimage (or the X server) in a lower screen mode. In lower resolution modes, less memory is needed to manipulate images and background. (See under ``Command-line options''). Try using 8-bit/pixel modes instead of true color modes. Tnimage reserves a fixed amount of memory for drawing dialog boxes and error messages. The amount of reserved memory is also screen mode-dependent.

3. In the DOS version, memory is limited only by the available hard disk space. More virtual memory can be created by using a disk utility to unfragment your hard disk.

4. If high resolution is not essential, images can be loaded in a small size. Loading an image with ``X size=50'' and ``Y size=50'' uses only 1/4 as much memory as a full-size image. (See under ``File menu...Open image'').

5. Erase FFTs as soon as possible by selecting ``File...Erase FFT''. Fourier transforms use large amounts of memory.

6. In Linux and other Unix-like OSs, memory is often limited for individual users in /etc/security/limits.conf or in /etc/profile. These values can be increased on a per-user basis by the system administrator.

7. In Windows, the program will not have enough memory, if there is less than about 2 MB of disk space available. In this case, the program will not start, and Windows will pop up an "Insufficient Memory" error message or may crash. Try closing some applications and/or windows on the screen and try again, or reboot a couple of times.