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Daguerre
 Post subject: NL Filter disabled
PostPosted: Mon Jun 22, 2026 4:21 am  (#1) 
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Joined: Jul 21, 2025
Posts: 27
Hi, I don't know why but today the NL Filter is disabled.
I emptied the cache, restarted GIMP more than once, restarted the mac but it is always disabled.
I didn't change anythin gon this mac recently so I cannot realize what it is happening to this filter that i often use.
Any suggestion?
ImageflterNL_disabled_22062026 by Francesco Dini, su Flickr


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rich2005
 Post subject: Re: NL Filter disabled
PostPosted: Mon Jun 22, 2026 4:54 am  (#2) 
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Joined: Mar 04, 2011
Posts: 2604
Daguerre wrote:
Hi, I don't know why but today the NL Filter is disabled.
I emptied the cache, restarted GIMP more than once, restarted the mac but it is always disabled.
I didn't change anythin gon this mac recently so I cannot realize what it is happening to this filter that i often use.
Any suggestion?


Maybe the image has an alpha channel - if it has turn it off.

Attachment:
alpha.jpg
alpha.jpg [ 14.61 KiB | Viewed 105 times ]


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Daguerre
 Post subject: Re: NL Filter disabled
PostPosted: Mon Jun 22, 2026 5:31 am  (#3) 
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GimpChat Member

Joined: Jul 21, 2025
Posts: 27
rich2005 wrote:
Daguerre wrote:
Hi, I don't know why but today the NL Filter is disabled.
I emptied the cache, restarted GIMP more than once, restarted the mac but it is always disabled.
I didn't change anythin gon this mac recently so I cannot realize what it is happening to this filter that i often use.
Any suggestion?


Maybe the image has an alpha channel - if it has turn it off.

Attachment:
alpha.jpg



Hi, yes, it depends by the alpha channel automatically added, thanks a lot
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Wallace
 Post subject: Re: NL Filter disabled
PostPosted: Mon Jun 22, 2026 7:02 am  (#4) 
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Joined: Aug 10, 2012
Posts: 14055
Location: Native to NYC living in Arizona, Gimp 2.8 - 3.0, Win 11 PC.
One of the most common reason the NL Filter is suddenly grayed out in GIMP,
is that the active layer now has an alpha channel (transparency),
or the image is in Indexed mode.
The NL Filter won't run in either case.

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Daguerre
 Post subject: Re: NL Filter disabled
PostPosted: Mon Jun 22, 2026 7:22 am  (#5) 
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Joined: Jul 21, 2025
Posts: 27
Wallace wrote:
One of the most common reason the NL Filter is suddenly grayed out in GIMP,
is that the active layer now has an alpha channel (transparency),
or the image is in Indexed mode.
The NL Filter won't run in either case.

Sure, it depended by the fact that some days ago I enabled to add an alpha channel at the opening of an image in the preferences, I didn't know that it could impact on some plugin.
Thank you very much for your help.
:tyspin :tyspin :tyspin
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