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GraXpert – A fast and easy way to remove gradients

Posted: Mon Nov 20, 2023 11:16 pm
by pedro

DIGITAL IMAGE PROCESSING TUTORIALS | Pedro RE'
GraXpert – A fast and easy way to remove gradients
Now integrated in PixInsigth
https://pedroreastrophotography.com/

GraXpert is designed to remove gradients from astroimages. Gradients are gradual changes in brightness that are not part of the astrophoto but are caused by external interference.

Some causes can be light pollution, incorrect or missing flat correction, natural brightness gradients of the night sky, or peculiarities of the optics used (such as shading in the form of a vignette).

Color casts can also be removed, and it generally makes sense to reduce the amount of the sky background in the astrophoto. In short: A gradient removal is very useful, if not mandatory.

GraXpert is a freely available open-source software that was programmed exclusively for this purpose. It works as a stand-alone program, and now it is integrated in PixInsigth.

ImageNGC7000_SAMYANG_135_F28_41X5Min_Median_20231004_DDP_crop_proc_NXT_BXT by Pedro Re', on Flickr

ImageNGC7000_SAMYANG_135_F28_41X5Min_Median_20231004_DDP_crop_proc_Annotated by Pedro Re', on Flickr

ImageNGC7000_SAMYANG_135_F28_41X5Min_Median_20231004_DDP_crop_proc_Annotated_NEG by Pedro Re', on Flickr

ImageWIDE_FIELD_CMOS_IMAGING_NGC7000_20231004 by Pedro Re', on Flickr

Imageroll-off-roof_1_20231004_mosaic by Pedro Re', on Flickr

Imageroll-off-roof_1_20231004 (23) by Pedro Re', on Flickr

ImageDIGITAL_IMAGING_TUTORIALS_GRAXPERT_PIXINSIGHT_GHS_NGC7000_20231004 by Pedro Re', on Flickr

ImageNGC7000_SAMYANG_135_F28_41X5Min_Median_20231004_DDP_crop_proc_NXT_BXT_GraXpert_proc by Pedro Re', on Flickr

ImageNGC7000_SAMYANG_135_F28_41X5Min_Median_20231004_DDP_crop_proc_NXT_BXT_GraXpert_proc_neg by Pedro Re', on Flickr

Re: GraXpert – A fast and easy way to remove gradients

Posted: Tue Nov 21, 2023 2:35 am
by KMH
That's a beautiful image, and observatory!

Kevin

Re: GraXpert – A fast and easy way to remove gradients

Posted: Tue Nov 21, 2023 12:06 pm
by Montana
Thanks Pedro, I've used this before and never got on very well with it ;)

Alexandra

Re: GraXpert – A fast and easy way to remove gradients

Posted: Wed Nov 22, 2023 6:18 pm
by cte
Top notch equipment and beautiful wide field imaging !

Re: GraXpert – A fast and easy way to remove gradients

Posted: Sat Dec 09, 2023 1:37 pm
by Wyvern
Just incase anyone's interested, here is an after and before shot following "automatic" processing through GraXpert.
Does what it says on the tin!!!
You can see the light gradient I've got on the bottom,non GraXpert'ed image towards the top right hand corner.

It's free, it works,..... :hamster:

Les