ABSTRACT
This chapter looks at some specific methods rather than an entire workflow. These consider imaging through separate filters as well as some additional and alternative tools for improving the detail and noise levels in more challenging targets. Deconvolution is a process of counteracting the light spread caused by diffraction and optical aberrations. The outcome is a sharper image, with smaller, brighter stars and some improvements in target details. To form a color image requires these to be associated with a color channel. There are pros and cons to combining the images before or after stretching. Human vision is very sensitive to green yet they rarely exist in astrophotographs. Noisy pixels, that happen to be green, are very apparent and are best replaced by a neutral tone. There is an important distinction, this is not to say we are reducing the green content in all color pixels, only those where green is dominant.
