You shouldn't need to do layers. Open both images (Light and Dark) into photoshop.
Select your light image then go >Image>Apply Image> in the top drop down box select your dark> go to the blend box at the bottom (leave the other boxes as background and gray) and select >subtract with opacity 100, scale 1 and offset 25 and click> OK.
Now go into Edit>Fade Apply Image and adjust the slider until you are happy (do this straight away, don't do anything else or you won't get the Fade selection). And that is it. You can also play around with the opacity, scale and offset in the apply image dialogue box as well and see which works the best.
Do you have a light source somewhere nearby that might also be contributing to the gradient? Also it looks as though your darks were taken at a different temperature than your lights. See how you have black dots in some of your stars. That could be why that happened. When do you take your darks in relation to your lights and what sort of temperature difference would there be? For every 6 degree drop in temperature you will halve your dark current, though I'm not sure if that includes amplifier noise.
That's a shame. If you could convert your avi of lights and darks to individual bmps using Virtual Dub, you could then load them into Deepsky Stacker and see how it processes them.
As for V3 and V4 of Registax, I found that 4 does a better job in this department.
If you could convert your avi of lights and darks to individual bmps using Virtual Dub, you could then load them into Deepsky Stacker and see how it processes them.
I don't use avi's. They are long exposure single images and are 24 bit .bmp's out of the camera.
Last edited by ballaratdragons; 19-07-2007 at 12:57 AM.
Ok, Any chance of zipping some up and emailing them to me so I can have a bit of a play with them?
Paul, you are going to want to kick me
I don't know how to 'Zip' things and send them. Laurie had to send me a special program just so I could 'Un-zip' things
I don't know much about computers at all.
Leave it till tomorrow when I'm not so tired and I might be able to concentrate on how to zip.
My poor ol' brain is going round in circles after your processing instructions.
I'll pm you tonight Ken and we'll look at it. I'd like to have a go and see what else can be done. It would be a shame if it we could do more with the amp glow, being able getting rid of it would really cap a great picture.
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Any chance of zipping some up and emailing them to me so I can have a bit of a play with them?
