GIMP Version: 2.8.9
Operating System: Windows
GIMP Experience: New User

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I wanted to use the 2 patterns offered by nzdawghaus here (#99):
http://gimpchat.com/viewtopic.php?p=103225#p103225
but it gives a dirty result :

and I tried several filters G'Mic (repair) but to no avail.
Is it possible to improve these patterns?

The pattern works OK, I think you get the "dirty" result because your are in a color-indexed image so you have a "binary" alpha-channel and can't use the partial transparency that makes the shadows...

Works for me, level_0.

ofnuts

I just used the filling tool on a white background

lylejk
not seen your answer... but have you tried on a white background?

thank you both for going over the topic to tell me that the pattern was clean but still being at level_0, it did not tell me what I had to do to not have the black grains ...

How are these 2?

What I did:
Add Layer Mask - Transfer layer's alpha channel.
Show layer mask.
Then played around with contrast, levels, curves until the shadows were eliminated.
Exported as png.

It is as Ofnuts pointed out, in an Indexed mode image the drop-shadow is dithered. Why? Indexed does not support partial transparency, either all or nothing, so the shadow is replaced by spaced solid dots. (dithering)

When converting to indexed Image -> Mode -> Indexed there is an option to turn that off. The semi-transparent then becomes solid.



To fix it for Indexed, remove the drop shadow. Fortunately not too difficult with those patterns.

Right click on the pattern in the patterns dialogue and open as an image.
Use the colour select tool with a large threshold



Cut the selection.
Export that as a png and put the file in your Gimp patterns folder. Gimp can use pngs and jpegs as pattern files without converting to a Gimp.pat file That one attached, I will let you practice on the other one.

EDIT: No - still produces a rubbish result. Needs a degree of cleaning. Try as described by Blighty.

Hate to be beat, this time cut-outs using a path, since there is symmetry, only had to make one then much duplicating, moving and flipping

Thanks for these latest new answers (Blighty, Wallace, rich2005, I love you )
I will come back after studying all this!
Thanks to you, I'm learning a lot!

Using all your advice, I thought I finally got it:

but the result is not great:

I do not know if I'll do it today because I'm starting to tire!