Blur in compositor produces artifacts #39307
Labels
No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset Browser
Interest
Asset Browser Project Overview
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
EEVEE & Viewport
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
EEVEE & Viewport
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Priority
High
Priority
Low
Priority
Normal
Priority
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
No Milestone
No project
No Assignees
6 Participants
Notifications
Due Date
No due date set.
Dependencies
No dependencies set.
Reference: blender/blender#39307
Loading…
Reference in New Issue
No description provided.
Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
System Information
Operating system and graphics card
Win 7 64bit, ATI Radeon HD 5700 series
Blender Version
Broken: official 2.70, but was present in older builds too
Short description of error
Certain values of blur produce artifacts.
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Just render the attached file and see the borders of the blurred area where it gets sharply cropped. This only happens with some values of blur. Also visible on attached image.
blurBUG.blend
Changed status to: 'Open'
Added subscriber: @cdog
Added subscribers: @LukasTonne, @Sergey
@LukasTonne, mind looking into this report? :)
Added subscriber: @Jeroen-Bakker
@Jeroen-Bakker assigning to you, seems to be combination of opencl and maybe area-of-interested once more ...
NOTE: You may have to bump up the brightness on this image, i couldn't see the error at first.
Added subscriber: @ignatz
I believe that the artifacts that cdog is referring to are more clearly seen in the attached rework of his image.
I bumped the gamma from 1.00 up to something like 1.85 and there is clearly some 'garbage' on the edges of the blurred cube.
Yes, that's it. Sorry - I guess my screen is too bright, so I could see it well :)
I wonder, though, if the part where it gets narrower should be there at all (when blurring in X direction only). I would expect the correct result to look like this.
Added subscriber: @sebastian_k
Yeah, confirmed as well. Interestingly it only happens with 256x256. If I set chunks to anything else. for example 32x32, it looks fine.
The issue also happens when the chunks are on different size:
for chunks 64x64 the bug happens when the X is set lower than 64
etc.
so will check the tile dependacy of the fast gaussian blur
Changed status from 'Open' to: 'Resolved'
Fixed in
d9557d01bd
"The fast gaussian blur is not an accurate formula. When deciding
which tiles are selected for input there was always a constant for correcting
Strange enough this was issue was not been raised before. There might be other 'settings' that this issue still happens. If so we need to increase the value again.