M 5 Using Generalized Hyperbolic Stretch (Jerry Yesavage)

Celestial hemisphere: Northern · Constellation: Serpens (Ser) · Contains: M 5 · NGC 5904

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M 5 Using Generalized Hyperbolic Stretch

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M 5 Using Generalized Hyperbolic Stretch

I have been trying to understand Generalized Hyperbolic Stretch (GHS) and put it to work here on the L which is HDR (30s and 3s).

Using GHS brought out more stars than were apparent in the standard STF stretch... especially given my Bortle 6 light pollution.

I have spent some time decrypting GHS and my notes are below.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Step 1:

Set D to bring stretched Target View into 2 of 4 quadrants in preview.

Step 2:

Set Zoom to 200 so you can see the linear data (The planned stretch is way to the right in grey)Click on the image preview to a spot that is near fine nebula versus background.Click send to SP (Symmetry Point)The point can be adjusted to be in the center of the area you want to separate.. vertical line… the Red line is the stretch

Step 3:

Now adjust D and b to increase the stretch to taste… this is a bit overdone, but makes the point…

This can be repeated, but this is the basic process... which took a long time to "get".

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Status	Advanced success
Started	...
Astrometry.net job	5863862
PixInsight job	OEW8YC9PBDU5ZX5LSWVI0EK1XI7IYCJK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	15h18m35s.277
RA (top/left)	15h19m16s.668
RA (top/right)	15h17m54s.120
RA (bottom/right)	15h17m53s.893
RA (bottom/left)	15h19m16s.541

Dec (center)	+02°04′41″.70
Dec (top/left)	+02°15′00″.76
Dec (top/right)	+02°15′02″.49
Dec (bottom/right)	+01°54′23″.30
Dec (bottom/left)	+01°54′21″.66

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M 5 Using Generalized Hyperbolic Stretch

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