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Nice shots Baz.
The way you replace the core with the shorter expsoure core shot is this way (well one of a few ways):
1. You process 2 images, one is the long exposure image with the burnt out core and the other is the core shot composed of short exposures where the core is not burnt out (that may be 15 seconds with some scope/camera combos).
2. Open both in Photoshop.
3. Click on the short exposure image. Use the colour range tool, click on the core area and use the fuzziness slider so it selects the core region that you want to install on the long exposure.
Feather your selection 75 pixels.
Select/save selection. edit/copy
4. Click on the long exposure.
select/load selection
Now the core area is selected same as in short exposure
edit/paste
now the core has been replaced.
5. Use levels, shadows/highlights etc to match the 2 as well as you can.
You may need to use the sponge tool and set it to dodge and rub on the transition area to brighten it up if needed.
Viola - photoshop magic.
Greg.
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