Removing gradients in images

[Desmond]

Hi,

 

I am processing a couple of images from last night and the subjects were low in the sky, hence I have some gradients in the images. Since I was not using a filter, any suggestion for removing gradients? 
I have Photoshop as my  main processing application.

Any help much appreciated

[Seelive]

Depends upon how serious the non-uniformity of the gradients are and whether you were imaging a large scale object with its own variation in intensity. Gradients in images of star fields are usually easily removed, gradients in images that contain large amounts of 'nebulosity' less so.

[Desmond]

That makes sense. I think some of the more advanced image processing apps for this stuff does it a little better than Photoshop? OR maybe I'm just being too hopeful

[Aramcheck]

There's a plugin you can try for Photoshop called Gradient Xterminator. It has a free trial:- https://www.rc-astro.com/resources/GradientXTerminator/

I use Pixinsight which has a process called DBE (Dynamic Background Extraction). Other software have similar tools (Siril, APP & Startools).

In Gimp or PS you can also create your own gradients & then subtract them... Ultimately it's whatever works best for you.

Cheers
Ivor

 

[rickwayne]

Astro Pixel Processor has a terrific gradient tool. It's quite easy to use and very effective. The app is of course also right up there for calibration and integration, I tune up the images I get out of it in Photoshop but I'm obsessive that way.

[PeterCPC]

Try AstroFlat Pro.

[AstroExploring]

I have a video for this on my YouTube channel. Gradient XTerminator is an amazing plugin that has saved my images more than once.