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+--- Thread: where is c2g in Gimp 2.10.12 ? (/Thread-where-is-c2g-in-Gimp-2-10-12)
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where is c2g in Gimp 2.10.12 ? - pistikem - 07-07-2019
hello, i am new to this forum. i just began to use the new Gimp v2.10.12 and i miss the c2g function i made use of for many years in v2.8. where do i find Gegl's c2g ?
RE: where is c2g in Gimp 2.10.12 ? - tmanni - 07-07-2019
Menu Colors > Desaturate > Color to Gray
RE: where is c2g in Gimp 2.10.12 ? - pistikem - 07-07-2019
wow, that's the thing i was looking for since yesterday - very helpful, many thanks !
2nd question : how can i change the number of CPU cores recruited for a GEGL process ? currently it uses only 2, that's a fraction out of 16...
RE: where is c2g in Gimp 2.10.12 ? - tmanni - 07-07-2019
(07-07-2019, 01:53 PM)pistikem Wrote: wow, that's the thing i was looking for since yesterday - very helpful, many thanks !
2nd question : how can i change the number of CPU cores recruited for a GEGL process ? currently it uses only 2, that's a fraction out of 16...
Go to Menu Edit > Preferences ; in the System Resources part, you can set the "Number of threads to use".
RE: where is c2g in Gimp 2.10.12 ? - rich2005 - 07-07-2019
As far as I know you also need openCL enabled and a working opencl driver in your linux.
RE: where is c2g in Gimp 2.10.12 ? - tmanni - 07-07-2019
(07-07-2019, 02:24 PM)rich2005 Wrote: As far as I know you also need openCL enabled and a working opencl driver in your linux.
No ; multi-threads processing and opencl processing are independant of each other.
You can use several threads without any opencl support.
RE: where is c2g in Gimp 2.10.12 ? - pistikem - 07-07-2019
great, thank you both, it suddenly started to use somehow all cores available - although i didn't change the settings in preferences, but opening its menu just did it apparently. nice speed up, as compared to v2.8 !
RE: where is c2g in Gimp 2.10.12 ? - pistikem - 07-07-2019
actually, it's pretty strange - i got it once only running on all cores, and since then it wants to make use of just two cores. any manipulation under preferences and settings doesn't make a difference... does image type or image size matter in this respect ?
RE: where is c2g in Gimp 2.10.12 ? - rich2005 - 07-07-2019
You could go back to preferences and check that the number of threads are still 16. I thought that Gimp polled the system and set up accordingly...but...
I keep a cpu / memory widget in the kicker (using kbuntu here) and see the load jumping about but yes, 2 cores do seem to be favoured but not always the same ones.
I put a widget on the desktop, captured a C2G opp as a video (but can not honestly inflict that on anyone, so screenshots). Obviously processes (ffmpeg) are running in the background, but a good indication of what is going on.
Starts evenly balanced : https://i.imgur.com/IAhM38f.jpg
but by half way favours cpu0 & cpu1 https://i.imgur.com/aPTi0qV.jpg
almost finished, still mostly cpu0 & 1 but a bit of load on 3 & 4 https://i.imgur.com/o3hETk5.jpg
Takes about a minute here for that size image - 16 bit, 3400 x 3400
What does it prove? Not a lot except not to worry about it too much
RE: where is c2g in Gimp 2.10.12 ? - pistikem - 07-07-2019
thank you, rich2005. there may be something broken in my Gimp version or in the environment it runs in on my Slackware box : it usually uses 2 cores - but then when i play a bit in the Color to Gray GUI window, for example with 'split window' or even just pressing 'cancel', Gimp suddenly makes use of all cores for quite a while till the end (24 Mpxls), or interrupts this and goes back to the 2-core speed. i monitor this with xosview or with nmon. it's quite erratic and is annoying as i have a workflow in which i want to keep processing times as short as possible...