Stretch Academy

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STF Utilization

Published 03/13/2023  This video shows you how to use the STF tool in a definitive way.  I refer to more STF videos in this lesson.…

STF to HT Transfer

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Connecting with the Histogram

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Where the USEFUL data is

Published 03/21/2023   Just because you can see it in your data…it doesn’t mean you can use it! This video highlights that stretching images comes…

Non-Linear Images in a Straightforward Way

Published 2018  This video explains the idea of non-linear relationships in data and how that plays a role in image processing in PixInsight. This concept…

Shape of the Stretch : Midtones Transfer Function and Gamma Curves

Published 03/21/2023  When you perform a midtones adjustment you are making a non-linear stretch. However, what exactly is this function. It is called the “Midtones…

Shape of the Stretch: Zoology

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Midtones Transfer Function Demonstration

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Slow Stretching

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Masked Stretch

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Masked Stretch Real Example

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GHS Tour

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GHS Diving In

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GHS Stretching M51

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GHS Stretching M51 RGB Color

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GHS and M42

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GHS Comparing Paths (M42)

Published 04/26/2023  Having created a stretched version of M42 via GHS- a quick comparison to another path (what I would typically do pre-GHS). This workflow…

Consequences of Stretching

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Starless Images and Stretching Part 1

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Starless Images and Stretching Part 2

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Stretching Narrowband Data Part 1

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Stretching Narrowband Data Part 2

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Stretching Narrowband Data with Color Modifier

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Introduction to Exponential Transformation

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Exponential Transformation

<p>This section takes a deep dive into Exponential Transformation. This process contains two methods for increasing the brightness and contrast of faint features. However, the details of how the methods work and how they are related to the free parameters is completely unknowable without documentation- which unfortunately does not exist in the program. This lesson offers a complete description of the tool and its usage.&nbsp;</p> n<p>The information concerning the pixel math expressions for the two methods comes from Rob Kantelberg who published a webpage on this process in collaboration with Carlos Milovic.&nbsp;</p> n<p>&nbsp;</p> n<p><img src="//sh-cosmiccanvas.s3.us-west-2.amazonaws.com/Video_Posters/ExponentialTransformation.jpg" alt="" width="900" height="600" /></p>

Slow Stretching demo

Published 07/24/2018   This short lesson demonstrates a common method of dealing with objects that have a very bright central region and everywhere else in…