I use this filter quite often in G'MIC. One of my favs. For quite some time now, it either doesn't work, or times out. I just tried the stock settings, on an 800x600 photo with mostly black and white (snow scene), and it I went to over 220 seconds, and it did nothing. Why does this filter not seem to work anymore? Thanks.

I waited for over 220seconds, and got tired of waiting. It's always taken a bit of time to execute, but nothing like now.

I let it run this time, and it took 285 seconds to execute. Much longer than it used to. And, like I said, on only a 800x600 photo too.

Nnnnnnope.

Waiting for the experts on this one.

on this image it took about 2 minutes/2 minutes and a half, but it's much bigger (approx 1600x1200).


G'MIC 1.6.9
Gimp 2.8.16

That is strange.
On my machine (Ubuntu Linux), Pencil Portrait on a 1200x1600 image takes 5 seconds.
I have a 24 cores machine, but anyway, that' would be a quite reasonable time even with a single core
(with my 24-cores, I have a x8-x10 gain, not much).

yes, strange.
Could someone else of the Gimp-chatters post their experience?
I tought mine was already good, but certainly a few seconds...is much better!

On my antique machine - Ubuntu Linux, 32 bit, 2 cores - a jpg of about 800 x 1100 took about 1 minute.

david.

So, well that's my experience.
I've just recorded a video of the whole process, with a 2048x1365 image.
It takes approximately 10 seconds to compute the effect.



EDIT : I've just tested on a Virtualized Windows 7 (simulating a single core), and it takes approx 30-35 seconds for a 1200x1600 image as well.

Me -as well as any other around here- didn't have any doubt on the performances of your machine.
I guess you could possibly get you an aside PC more "common" (cheap or even used) where to test G'MIC filters once released, to know in advance what your "followers" will experiment

Well, I certainly don't have a super computer, and pencil portrait has never been fast on it, but it takes over twice as long as it once did. There's a thread somewhere, where someone posted a few days ago that they were having problems with it too, although the thread had nothing to do with pencil portrait. That reminded me that I was having problems with it too. So I messed around with it, and it's still super slow.

Do you have an idea when this happened ?
Is it only the latest version 1.6.9, or is it older ?

On my old laptop (GMIC 1.6.9, Gimp 2.9.3, Vista 32 bit, 1.73 GHz, 1.0 GB RAM) is the same image of 512x512 (Lena)
1. Color - 70 seconds.
2. Black and white - 35 seconds.

So time does not only depend on the image size.

I've always had a reasonable render time. Since updating to Gimp 2.8.16 it has slowed down. My first run with Pencil Sketch after updating to G'mic 2.6.9 was tragic (first occurrence of a time-out, ever). I walked away after 220 seconds (1024x768 image). It completed while I was absent.
(Windows 8.1, 64bit. 2.7GHz 4 core, 8 GB RAM) and (Windows 8.1, 64bit. 2.7GHz 4 core, 16 GB RAM).
I sure hope it can be resolved.

PS: Out of curiosity I ran 7 simultaneous individual sequences on seven identically sized images after starting pencil sketch. All seven finished well before pencil sketch. It appears to be the one filter?

It took me 160" in a size 1600x1600.

900x900 BLACK as color (53 seconds) GIMP-2.8.16 windows 10 64 bit 1 core.



Same image with SamJ's newest GIMP-2.9.3 with G'MIC 1.6.9 BLACK as color (139 seconds)

I stand corrected. I was using GIMP-2.9.1 in that second portrait this is the correct result.
Same settings 32 seconds.