Adjusting levels in photoshop
After stacking your image, the first adjustment is bringing as much information as posible from the midtone levels.
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Make sure you adjust your monitor to show clearly
each of the steps in this greytone bar.
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Open your image.
This example is the planetary nebula Shapley 1
400 x 2.56 second frames
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From the Image/Adjustments menu open the Levels dialog box
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Adjust the black and white pointers to the left and right of the histogram.
the mid pointer can be adjusted to suit your taste.
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The result is that faint information is bought out.
Remember not to blacken the sky.
It isn't black!
You will loose too much subtle info with a jet black background.
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If needed, further subtle adjustments can be made using the Curves, Brightness/Contrast tools.
Clean up any spots where hot pixels have been removed with the Healing and/or Clone tools.
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Back to Image
Categories
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These screen shots are from Photoshop CS2.
Later versions may be different but the procedure remains the same.
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