CADET has an extensive on line help. You can find there all details about its use. Moreover, I have tried to design it so that it works in the simplest and more intuitive way. GUI (General User Interface) standards are mostly followed.

Find below some clarifications on points that usually puzzle the new user.

Disabled options:

Initially, several options are disabled. Most of them will be enabled after loading an image file. However, further steps are necessary in order to enable the Edit menu.

To enable the Edit menu you must first select a rectangle in any image. Keep the left button pressed while dragging the mouse over the image. Once the rectangle is drawn, the Edit menu will be enabled and you will be able to create a new image from the rectangle or define the PSF and reference stars.

The Select as Register star option in the Edit menu will only be enabled during the calibration process, providing that the Register on reference star choice has been selected. During calibration, only Select as Register star, Background and range, View negative image and Help options will be enabled.

The Convert to B&W and Split tricolor options in the Edit menu will only be enabled if the active image is a color image.

Default options:

CADET will automatically save several options. This way, when entering the program you will find the same options defined the last time CADET was used.

The saved options are the following:

· Language
· Optimize resolution when saving FITS files
· Working directory
· Filter type and intensity, Butterworh filter order, percent cutoff for Butterworth filter and FWHM parameter for digital development
· Adjust image dimensions option for arbitrary
· Type of alignement for calibration and digital development
· Confirm images, ask for reference star selection and enable warnings of potential problems during calibration
· Type of combination during color combine process
· Type of PSF (star or gaussian), soft PSF option, FWHM gaussian parameter and type of deconvolution (Maximum Entropy or Richardson-Lucy) for deconvolution.
· Type, intensity and parameters of filters (sharp, blur and unsharp mask).
· Mono or multichannel option for filtering.
· Unsharp mask contrast factor.
· "Use bias frames" option, as well as temperatures, exposure time and doubling temperature.
· Sigma clipping option and threshold.