Several processing filters have been implemented so far:
Operators: Negative, Addition, Subtraction and Multiplication
Colors: Brightness/Contrast/Gamma, Midtone, Balance, Hue/Saturation
Filters: Blur, Sharp, Deconvolution, Gradient, Morphological, Digital
Astro: Denoising, Debloomer
Additionally you can export the image to your preferred editing application (Photoshop, Gimp, etc) by Menu->Image->Process With...
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