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Third in a series of video tutorials on v2 of the Generalised Hyperbolic Stretch (GHS) script by Mike Cranfield for Pixinsight users. In this tutorial, M51, a spiral galaxy with interesting features is used as the subject matter. The first half of the video describes the properties of the hyperbolic equations used in the script, why they are appropriate for stretching and how they encompass existing transforms, and even extend their utility. The video also demonstrates how the stretching script, can be applied to avoid artifacts, preseve data integrity, explore the features of the data, and even invert previous stretch results. The second half of the video shows how the "arcsinh stretch process" has been incorporated into the GHS stript and can be used to enhance colour saturation and avoid "bleaching" while stretching. This allows for the benefits of both the GHS transform benefits, together with the colour enhancing benefits of the arcsinh process. In addition, the blending option is described where the results of a stretch can be back-blended with previous or other versions of an image to mitigate changes. Mike has created a fantastic environment in which to apply the hyperbolic stretch transforms, with many features that are described in these follow-up videos, as well as other videos hosted on the https://ghsastro.co.uk/ website. You can obtain the script from this website, and can easily install it into Pixinsight. Mike and I think this is an excellent addition to your image processing tool kit - and it's free.