Bug 513480

Summary: Background Blur very slow performance on Windows
Product: [Applications] digikam Reporter: andrej.valencic
Component: Plugin-Editor-BackgroundBlurAssignee: Digikam Developers <digikam-bugs-null>
Status: REPORTED ---    
Severity: normal CC: caulier.gilles
Priority: NOR    
Version First Reported In: 9.0.0   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description andrej.valencic 2025-12-17 14:04:53 UTC
SUMMARY

Unfortunately in this present form this tool is not very useful as it takes 10+ minutes to complete the transformation. Even changing some of the parameters and checking the result is very slooooow.
Are there any plans/possibilities to make this tool more responsive?

I'm using the latest build of DK on my Windows 11 computer  that is quite powerful (see bellow). Also support for AMD Radeon GPUs would probably help a lot.

OBSERVED RESULT

EXPECTED RESULT

SOFTWARE/OS VERSIONS

digiKam: 8.9.0
KDE Frameworks: 6.17.0
Qt: Using 6.9.1 and built against 6.9.1
Windows 11 Version 24H2
Build ABI: x86_64-little_endian-llp64
Kernel: winnt 10.0.26100

ADDITIONAL INFORMATION

CPU

     AMD Ryzen 7 7735HS with Radeon Graphics

     Base speed:    3,20 GHz
     Sockets:    1
     Cores:    8
     Logical processors:    16
     Virtualization:    Enabled
     L1 cache:    512 KB
     L2 cache:    4,0 MB
     L3 cache:    16,0 MB

     Utilization    2%
     Speed    3,64 GHz
     Up time    2:07:45:53
     Processes    219
     Threads    3868
     Handles    142036

Memory

     32,0 GB

     Speed:    4800 MT/s
     Slots used:    2 of 2
     Form factor:    SODIMM
     Hardware reserved:    3,3 GB

     Available    15,1 GB
     Cached    12,3 GB
     Committed    24,5/30,6 GB
     Paged pool    753 MB
     Non-paged pool    700 MB
     In use (Compressed)    13,5 GB (1,8 GB)

GPU 0

	AMD Radeon(TM) Graphics

	Driver version:	32.0.21037.1004
	Driver date:	28/11/2025
	DirectX version:	12 (FL 12.1)
	Physical location:	PCI bus 116, device 0, function 0

	Utilization	2%
	Dedicated GPU memory	2,6/3,0 GB
	Shared GPU memory	1,7/14,4 GB
	GPU Memory	4,3/17,4 GB