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Hello David,
Overall your images are far better than anything I do - mine often have gradients. Some of your monochrome images look excellent.
there are plenty of tutorials on the internet.
The processing I used is:
Open the image in PS. Flatten the image ("Image""flatten")
To remove any dust spots etc. is fairly easy. Open the paint brush tool and choose a brush size of around 15 (depends on image). "Alt Click" on a clear background near the spot. Then click on the spot. This will fill in the spot with the background colour.
To remove the gradient:
Flatten the image.
Then "layer" "duplicate layer" "ok".
You want to create a blank image of the gradient.
Now the hardest bit is to remove as much of the image and brighter stars as possible (from the duplicate). I usually do this with the paint brush tool also.
Open paint brush tool.
"alt click" on clear background near area to be erased.
click and move brush over area to be erased. The better you match the background colour the better this will work. You will need to "alt click" often to match the background gradient as best as possible at all points.
You do not have to remove all the stars - but the more patient you are with this is best.
Once you have finished do "filter" "noise" "median" and choose a value somewhere around 20 - 40 which ever looks best. Now you have a background gradient.
Next step is to create an offset.
Open original image (bottom right)
then "layer" "new" "layer" "ok"
Then click on set foreground colour (left icons near bottom).
On the colour picker window move the selector to near the bottom left to give RGB values of around 10 - 20.
click ok.
View the new layer (close the viewer for the other 2 layers).
This layer will be blank - or black and white squares.
Open the paint bucket tool - left icons half way down (you may need to right click on the gradient tool to see it).
Then click on the layer image- this will create an offset. On the bottom right menu above the layers - click on the box that says "normal" and change it to linear dodge.
Open the view (eye in the box) in all 3 layers.
Then "fx" "blending option" and change blend options to either difference or subtract.
This should delete the gradient from the original image.
flatten the image.
You can then adjust saturation etc.
Let me know if you need more help.
Regards,
Tony.
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