Bug 360764

Summary:	G'mic interactive colorize integrated with Krita is much slower than stand-alone G'mic
Product:	[Applications] krita	Reporter:	Rastaban26 <regulus2626>
Component:	G'Mic for Krita	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	minor	CC:	halla
Priority:	NOR
Version First Reported In:	3.0 Alpha
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Rastaban26 2016-03-20 09:13:31 UTC

When using standalone G'mic from command line the preview (and final processing) of colorization works much faster than when I work on the same image in Krita (integrated g'mic).
For stand alone G'mic I'm using comand:
gmic input.png -x_colorize 1,1024,1 -split c,2 -o[-1] output.png
input.png is here: http://sta.sh/03evnbtvq9p

I'm aware that Krita can do a lot of more processing around the actual colorization. However, I thought it would be a good idea to let you guys know about this just in case.


Reproducible: Always

Steps to Reproduce:
1. Colorize image in Krita (G'mic interactive colorization)
2.  Colorize image in stand-alone G'mic
3. Compare performance and times

Actual Results:  
On my hardware using G'mic integrated with Krita colorizing an image works 2-3 times slower

Expected Results:  
Not sure if it's possible to achieve the same time. Please consider this only as an info.

CPU: Intel i5-3210M @2.50 GHz 
Memory: 8 GB 
System: Windows 7 64b 
GPU: NVIDIA GeForce GT 630M 
Tablet: Wacom Bamboo

Comment 1 Halla Rempt 2016-03-20 10:14:15 UTC

Hi,

Thanks for your report.  I think that this is related to 

https://bugs.kde.org/show_bug.cgi?id=359030

so I'll add this bug report to that one.

*** This bug has been marked as a duplicate of bug 359030 ***

Comment 2 David Tschumperlé 2016-03-20 10:15:20 UTC

As a side note, let me say that the main colorization algorithm is not multi-threaded, so the difference cannot be due to the fact OpenMP is enabled in the CLI version of G'MIC.
I suspect this has to do with the different compilers used (G'MIC CLI uses g++, while Krita uses MSVC). I has observed the same kind of problems when compiling G'MIC CLI using MSVC : it is way slower to compile, but has also slower performances when executing filters.

Comment 3 Halla Rempt 2016-03-20 10:38:24 UTC

Okay, that explains the issue.