I've been searching for a few good tutorials an adding narrow band image data from a mono camera to an RGB image taken from an OSC camera. Lots about taking RGB stars and putting them on narrow band data but that's not what I'm looking for.
Adding narrowband data to OSC images.
It depends on what you are trying to achieve.
If the intent is to accentuate the Ha in a wideband image of, say, a galaxy, then this can be achieved by adding a percentage of the narrowband Ha to the R channel of the RGB image using Pixelmath or similar, or by blending into the R channel in Photoshop.
If the intention is to produce an image that has both strong narrowband targets and wideband targets in the same frame (e.g. Dengel Hartl 5 and friends) then the two stacks can be combined in PixelMath using a Max formula or similar as appropriate to the situation. This could also be done in Photoshop, blending and masking the relevant areas.
This works better if the stars are removed first.
There are also PixInsight processes such as NBRGB Combination, but I've never managed to achieve quite what I wanted with this.
Some useful tutorials: PixelMath method: https://www.youtube.com/watch?v=1Wd7VxpMCH4
NBRGBCombination: https://chaoticnebula.com/pixinsight-nbrgb-combination/
Continuum: https://pixinsight.com/tutorials/narrowband/index.html
e.g. Narrowband (OSC using dual narrowband filter)
RGB using L_Pro:
Max( narrowband, RGB)
If the intent is to accentuate the Ha in a wideband image of, say, a galaxy, then this can be achieved by adding a percentage of the narrowband Ha to the R channel of the RGB image using Pixelmath or similar, or by blending into the R channel in Photoshop.
If the intention is to produce an image that has both strong narrowband targets and wideband targets in the same frame (e.g. Dengel Hartl 5 and friends) then the two stacks can be combined in PixelMath using a Max formula or similar as appropriate to the situation. This could also be done in Photoshop, blending and masking the relevant areas.
This works better if the stars are removed first.
There are also PixInsight processes such as NBRGB Combination, but I've never managed to achieve quite what I wanted with this.
Some useful tutorials: PixelMath method: https://www.youtube.com/watch?v=1Wd7VxpMCH4
NBRGBCombination: https://chaoticnebula.com/pixinsight-nbrgb-combination/
Continuum: https://pixinsight.com/tutorials/narrowband/index.html
e.g. Narrowband (OSC using dual narrowband filter)
RGB using L_Pro:Max( narrowband, RGB)
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I have yet to take the inevitable plunge into PixInsight so everything I do is still in Photoshop. In Photoshop, or any other software that lets you separate color channels, one can add narrowband data to the individual color channels after separating the RGB image into three grayscale images, one for each color. Using the Lighten blend mode, add an Ha layer to the red image at 85% opacity and an Ha layer to the blue image at 15% opacity (there is a weak Ha line in the blue end of the spectrum). Layer your Oiii data on top of both the green and blue images at 50% opacity. Flatten all three images, then recombine them into a single RGB image. For an extra little "pop" add a Selective color adjustment layer to the RGB, choose Reds, and reduce the Cyan by about 10%.
Arnie
Arnie
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