Redundant anti aliasing/blur effect #77370

New Issue

Anže · 2020-06-04T14:28:59+02:00

Anže commented

2020-06-04 14:28:59 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-03 18:45, hash: b94ab93dfb
Worked: (2.83.0)

Short description of error
In the viewport and everywhere where you can see an image there seems to be a blur effect added to the pixels. You can't see the real flat squares but a foggy pixel instead. It looks like some kind of interpolation.
The images are correct when looked at outside of Blender. For example if you open the renders in Photoshop they look normal. But if you open any image and put it in the image editor the pixels get blurry.

In the first image I put the sample count to 1 and pixel size to 8x so that you can see the error clearly

Default scene and altered pixel size settings

In the second image the settings are set to the defualt ones and I have zoomed into the renders.

Comparison of the same image opened in Photoshop and Blender

Exact steps for others to reproduce the error

Open Blender 2.90.0 Alpha
Add a HDRI image to the background to quickly lit the scene

Render the scene and look at it in the image editor

or

Import a image into blender
Look at it

A test file I used: {F8576485}]

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-03 18:45, hash: `b94ab93dfb` Worked: (2.83.0) **Short description of error** In the viewport and everywhere where you can see an image there seems to be a blur effect added to the pixels. You can't see the real flat squares but a foggy pixel instead. It looks like some kind of interpolation. The images are correct when looked at outside of Blender. For example if you open the renders in Photoshop they look normal. But if you open any image and put it in the image editor the pixels get blurry. In the first image I put the sample count to 1 and pixel size to 8x so that you can see the error clearly ![Comparison_bug.png](https://archive.blender.org/developer/F8576467/Comparison_bug.png) Default scene and altered pixel size settings ![example_bug.jpg](https://archive.blender.org/developer/F8576679/example_bug.jpg) In the second image the settings are set to the defualt ones and I have zoomed into the renders. ![Closeup_bug.png](https://archive.blender.org/developer/F8576478/Closeup_bug.png) Comparison of the same image opened in Photoshop and Blender ![Ps_vs_Blender.png](https://archive.blender.org/developer/F8576523/Ps_vs_Blender.png) **Exact steps for others to reproduce the error** - Open Blender 2.90.0 Alpha - Add a HDRI image to the background to quickly lit the scene # Render the scene and look at it in the image editor ``` or ``` - Import a image into blender - Look at it A test file I used: {[F8576485](https://archive.blender.org/developer/F8576485/290_Bug.blend)}]

Anže commented

2020-06-04 14:29:00 +02:00

Added subscriber: @koko_ze

Ludvik Koutny commented

2020-06-04 14:46:27 +02:00

Added subscriber: @Rawalanche

Ludvik Koutny commented

2020-06-04 14:46:27 +02:00

I'd consider this a feature, not a bug. The pixel size feature is used to subsample viewport result which is useful to boost interactivity and viewport rendering speed on high DPI monitors, where the 1x resolution scale can be too dense for preview purpose, requiring too many resources to have reasonable rendering performance. Up until recently, the pixel size subsampling was useless because it used nearest neighbor (pixel perfect) image scaling. Now it seems to use bilinear, which is much better as it makes this feature actually useful with high DPI monitors without introducing ugly aliasing artifacts.

You seem to be using that feature wrong. It's not a "make viewport look like a pixel art" filter. It's something intended to be used with high DPI screens. Your screen in 2560x1440 based on the screenshot, so you probably either don't need to use this, or should set it to 2x at the very most. 4x and 8x is meant for screens with huge resolution displays, for example the Mac Pro display.

I'd consider this a feature, not a bug. The pixel size feature is used to subsample viewport result which is useful to boost interactivity and viewport rendering speed on high DPI monitors, where the 1x resolution scale can be too dense for preview purpose, requiring too many resources to have reasonable rendering performance. Up until recently, the pixel size subsampling was useless because it used nearest neighbor (pixel perfect) image scaling. Now it seems to use bilinear, which is much better as it makes this feature actually useful with high DPI monitors without introducing ugly aliasing artifacts. You seem to be using that feature wrong. It's not a "make viewport look like a pixel art" filter. It's something intended to be used with high DPI screens. Your screen in 2560x1440 based on the screenshot, so you probably either don't need to use this, or should set it to 2x at the very most. 4x and 8x is meant for screens with huge resolution displays, for example the Mac Pro display.

Alaska commented

2020-06-04 14:51:10 +02:00

Added subscribers: @fclem, @Alaska

Alaska commented

2020-06-04 14:51:10 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Alaska commented

2020-06-04 14:51:10 +02:00

Can confirm.

Bisecting shows bdda53fdb2 as the cause, however, I'm not sure if it's intentional or not.

@fclem, are you able to comment?

Can confirm. Bisecting shows bdda53fdb2 as the cause, however, I'm not sure if it's intentional or not. @fclem, are you able to comment?

Anže commented

2020-06-04 15:09:15 +02:00

In #77370#944794, @Rawalanche wrote:
You seem to be using that feature wrong.

I set the viewport pixel size to 8x from the default just so that you can see the effect more clearly and that it is present in the viewport alongside the image editor. And yes I am using a 2560x1440 monitor :)

> In #77370#944794, @Rawalanche wrote: > You seem to be using that feature wrong. I set the viewport pixel size to 8x from the default just so that you can see the effect more clearly and that it is present in the viewport alongside the image editor. And yes I am using a 2560x1440 monitor :)

Clément Foucault self-assigned this 2020-06-04 15:31:50 +02:00

blender-admin commented

2020-06-04 21:27:34 +02:00

This issue was referenced by ba5b303c88

This issue was referenced by ba5b303c8886c9266309bada1cdeb71bcd8e59a3

Clément Foucault commented

2020-06-04 21:28:43 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2020-06-04 21:28:43 +02:00

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Redundant anti aliasing/blur effect #77370

Render the scene and look at it in the image editor