Modules

A module is one processing function. Every module takes the current image, applies its parameters and returns a new image that becomes the next step in the history.

Step	Module	What it does
Linear	Debayer	Turns the raw mosaic of a one-shot-color camera into a color image.
Linear	Crop	Cuts margins off the image or removes borders without data.
Linear	Rotate and Flip	Turns the image by 90° or 180° or mirrors it, without losing quality.
Linear	Bin and Scale	Shrinks the image by averaging pixel blocks or scales it by a factor.
Linear	Gradient Removal	Removes a smooth background gradient such as light pollution or vignetting.
Linear	Background Neutralization	Turns a tinted sky background neutral gray by equalizing the background level of the color channels.
Linear	Color Calibration	White balance on stars: scales the color channels so that the average star becomes neutral.
Stretch	Histogram Stretch	Brightens the faint parts of a linear image.
Stretch	Arcsinh Stretch	Brightens faint parts while keeping star colors.
Stretch	Invert	Turns light into dark and dark into light.
Finish	Luminance Combine	Merges two open images of the same size: the brightness of one with the color of the other, or a plain blend.
Finish	Saturation	Makes the colors stronger or weaker while keeping the brightness, optionally sparing the dark background.
Finish	Green Removal	Removes a green cast by limiting green to a neutral reference built from red and blue.
Finish	Noise Reduction	Smooths away noise while keeping stars and edges sharp.
Finish	Unsharp Mask	Sharpens fine detail by adding back the difference to a blurred copy.
Finish	Star Reduction	Makes stars smaller by shrinking them inside a soft star mask.