The Choices window
The choices dialogue box can be accessed either
by clicking on the icon bar icon with Adjust, or by selecting
'Choices' from the icon bar icon menu. Either approach will open a
window. Across the top is a strip of file type icons. Clicking on
these icons, will open a sub configuration window for the file
type.
The options provided for the file types are discussed below. The arrows at either end of the strip allow the available file types to be scrolled through.
Across the bottom of the configuration window is another row of icons. These allow various aspects of the program to be controlled. Each icon represents a group of related parameters. Again configuration windows can be opened by clicking on the icons.
Finally there is a 'Save' button. Clicking on this will save the configuration of the program so that it is the same when the program is next used.
Memory

This controls the programs use of memory. The top slider lets you set the maximum amount of RAM that it will use. The next two bars cannot be adjusted, they show the amount of RAM in use, and the amount of disc space being used as virtual memory.
Note that these bars can be confusing. The RAM bars show the proportion of the total RAM in the computer, typically 4Mb. or 8Mb. The disc bar shows the proportion of free disc space in use. The free space on the disc may be much larger or possibly smaller than RAM. You should not make relative comparisons of the RAM and Disc bars.
The writable icon 'Temporary file' allows the directory where the temporary file holding image data which will not fit in RAM is held. Clicking on the right pointing arrow to the side of this, will pop up a standard save box. The icon may be dragged to where you want the temporary file to be held. Note that if a temporary file already exists, you cannot change the location immediately this way.
It may be useful to leave the memory box open to give you some idea as to how much memory you are using. The RAM and Disc bars will be continuously updated.
The temporary file should be kept on a large area of fast writable disc. By default it is created inside the directory !Scrap. It is not a good idea to put the temporary file on a RAM disc. Doing so defeats the object, and the program can make use of any spare RAM more efficiently itself, rather than via a RAM disc.
Usually the temporary file will only become active when large images are being handled, in such cases you must have plenty of free space on the disc. At any rate using virtual memory requires large areas of empty disc space.
Windows
The five buttons on this window control the default appearance of
each new window. Whether the window will have rulers, a toolbox, an
info palette, if dithering will be enabled for it, and whether printer
margins will be shown.
Page
This allows the default page size, units and X and Y resolutions to
be chosen, by clicking on the appropriate right pointing arrow and
making a selection from the resulting menu.
General
There are several sections.
The first section allows the Aliasing filter used for the operations on the Edit menu to be set.
The second section consists of three writable icons which set the weights used when greyscaling images.
The next section allows you to specify what will happen whilst the program is busy working on a long process. The alternatives are to display the hourglass with a % sign, to multitask (which means you can carry on doing other things) or finally to blank the screen. Blanking the screen is useful because in screen modes with lots of colours and pixels the older Acorn computers run more slowly. Multitasking will be the slowest option, and it is not always possible to multitask for example when transferring files to other applications. It is possible to arrange for an audible 'beep' to be made at the start and end of each multi tasking process to give some sort of feedback.
Which of these options you choose will depend on how you work. For slow machines the multi tasking option may be useful. For large screen modes blanking will be most suitable. For a fast machine in a small mode, the hourglass is probably best.
The final option is to set the number of undo steps allowed. Increasing the number will use more RAM/disc space, but will allow more flexibility when experimenting with editing images.