Sharpening with Bilateral Blur Filter and 16 Bit image causing color artifacts

[Vasto7]

In the attached .afphoto file you will see color artifacts.  The file has multiple layers.  In the Group is a copy of the background file which has been inverted and a bilateral blur filter applied.  This layer has a Vivid Light blend mode. The next layer in the group is a copy of the background file with a Normal blend mode.  Finally the entire Group has an Overlay blend mode.  By adjusting the bilateral blur filter different amounts of sharpening are achieved.  This process works perfectly for an 8 Bit RGB image.  However, for a 16 Bit image it shows the color artifacts.  I believe the artifacts are an bug in Affinity.  A work around is to covert the image to 8 Bit, adjust the bilateral blur filter to your liking, merge visible and then covert the merged layer to 16 Bit. 

Thanks for  your hard work.

Bilateral_artifacts.afphoto

[MEB]

Hi Vasto7,
Thanks for reporting this. Issue logged to be looked at.

[Gnobelix]

Hello @Vasto7,

the artifacts are avoided, put the inverted layer in linear light and with an opacity of 50%.

Cheers

Bilateral_without_artifacts.afphoto

[Vasto7]

Thanks @Gnobelix,

Your suggested workaround seems to work very well.

[Gnobelix]

4 hours ago, Vasto7 said:

Thanks @Gnobelix,

Your suggested workaround seems to work very well.

You're welcome.

[Chip J.]

Thanks for posting this workaround.  I've been struggling with same issue.

 

[Bruceki22]

Has this issue been fixed in 1.10?  I am still getting these artifacts on my desktop, but am not getting them on my laptop when using the same technique.  Any ideas on settings that may be causing this?  I have not been able to differentiate any relevant difference in settings between the software on my two computers.

Thanks for any suggestions.