White balance for nebulae?

[Emanuele]

When dealing with Galaxies, when using the ColorCalibration Process, we select the whole galaxy (avoiding the core) because of the stellar groups in them, for whilte balance reference.

But what about nebulae ? Like the Cocoon? What would you select in a Cocoon Image as white reference?

Thank you,
E.

[Nocturnal]

You can probably select the entire image or select a few previews that don't include the nebula itself. The stars in those areas will be used to calibrate the color.

[vicent_peris]

Hi,

you can also transfer the white balance (asuming that atmospheric extinction is about the same in both images) of the galaxy image to the nebula one. When you do the color calibration of the galaxy image, the console outputs the RGB weights. You have two options to transfer these weight to your nebula image:

- In CC, put the white reference as your galaxy image. Instead of applying the color calibration to the galaxy image, apply the instance over the nebula image.

- Use the console weights in PixelMath to multiply each color channel of your nebula image. After this, make a background neutralization.

As an example, I've done the color calibration of this image:


[the greens are from a bad background neutralization, not from color calibration]

Taking as a white reference this image:





Regards,
Vicent.