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IDProjectCategoryView StatusDate SubmittedLast Update
0000225madVRbugpublic2014-07-09 18:252015-03-14 15:28
Assigned Tomadshi 
Platformx64OSWindows 8.1 ProOS Version6.3 (Build 9600)
Summary0000225: Poor chroma quality when image doubling is used
DescriptionOriginally thought to be an issue specific to downscaling when NNEDI3 image doubling is active, it seems that chroma quality can suffer when NNEDI3 image doubling is used without also enabling chroma doubling at the same number of neurons.
This is quite apparent with white text on a red background.
Steps To Reproduce1. Enable NNEDI3 image doubling
2. Set luma scaling to Nearest Neighbor (happens with anything, this is most obvious)
3. Display an image with white text on a red background
Additional InformationVisibility/severity seems to vary depending on the combination of scaling algorithms used.
If 720p is being doubled to 1440p, then downscaled to 1080p, the effect can be quite pronounced.
Original topic: [^]
I have had to recreate the original test image, as I no longer had a copy of it, and this one does not seem to show the problem as clearly for some reason.
As I see it, the main issue here is that enabling both luma and chroma doubling can be quite GPU intensive for little benefit other than avoiding this artifact showing up in rare circumstances.
Everything seems to be working correctly, it's just an unfortunate artifact that can sometimes appear from this combination of settings. (luma doubling without chroma doubling)
TagsNo tags attached.
madVR Version0.87.10
Media Player (with version info)JRiver MC 19.0.149
Splitter (with version info)LAV Splitter 62.0
Decoder (with version info)LAV Video 62.0
DecodingDXVA2 Copyback
Deinterlacingnone (progressive)
DXVA2 Scaling Activeno
Aero / Desktop CompositionOn
Problem occurs with modeall modes
GPU ManufacturerNVidia
GPU ModelGTX 570
GPU Driver Version337.88 WHQL
Attached Filespng file icon marlins-vs-rangers.png [^] (7,958 bytes) 2014-07-09 18:25

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-  Notes
madshi (administrator)
2015-03-14 15:28

This was fixed in v0.87.11.

- Issue History
Date Modified Username Field Change
2014-07-09 18:25 6233638 New Issue
2014-07-09 18:25 6233638 File Added: marlins-vs-rangers.png
2015-03-14 15:28 madshi Note Added: 0000743
2015-03-14 15:28 madshi Status new => closed
2015-03-14 15:28 madshi Assigned To => madshi
2015-03-14 15:28 madshi Resolution open => fixed

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