New features are being introduced quite regularly. Here is a list of main features:
Native image format support
unsigned 16-bit FITS files (other FITS are converted to this format on-the-fly)
AVI and many other film files
Image conversion (to the native FITS format only)
Supported input types: 8-bit and 16-bit BMP, TIFF, JPEG, PNG files, NetPBM binary images, RAW DSLR images.
Image registration; supported methods:
Translation using DFT centered on an object, generally used for planetary images
Translation using PSF of a star, generally used for deek-sky images
Manual translation with two preview renderings of the current image with reference frame in transparency
Image rotation and plate-solving are not implemented yet
Median sigma clipping
Winsorized sigma clipping
Linear fit clipping
Pre-processing of images with multi-channel offset, dark and flat images
Enhancement of final images: lightness/contrast cursors on each layer, different scaling modes (linear, log, square root, squared, asinh, histogram normalization), negative and false colour rendering and clipping.