In 2.91.0 Image Editor fractional zoom does not display images correctly with some image resolution and configuration of the working areas. #82999

New Issue

Mousy · 2020-11-25T14:03:54+01:00

Mousy commented

2020-11-25 14:03:54 +01:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 750/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862
Worked: 2.90.1

Short description of error
1024x768 images in Image Editor with fractional 1:1 zoom shows aliasing due to incorrect scaling or something related to interface.

Exact steps for others to reproduce the error
Open or render 1024x768 image and view it in image editor with fractional zoom 1:1 and maximized area of Image Editor.
Also, the appearance of the bug is influenced by the configuration of the working areas, for example, if two image editors are one above the other, then the fractional 1:1 zoom is correct. Also, at some proportions of the two editors, the display is incorrect. Perhaps 1:1 zoom works depending on the resolution of image and proportions of editor areas.
Zoom bug.blend

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 750/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75 **Blender Version** Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: `0f45cab862` Worked: 2.90.1 **Short description of error** 1024x768 images in Image Editor with fractional 1:1 zoom shows aliasing due to incorrect scaling or something related to interface. **Exact steps for others to reproduce the error** Open or render 1024x768 image and view it in image editor with fractional zoom 1:1 and maximized area of Image Editor. Also, the appearance of the bug is influenced by the configuration of the working areas, for example, if two image editors are one above the other, then the fractional 1:1 zoom is correct. Also, at some proportions of the two editors, the display is incorrect. Perhaps 1:1 zoom works depending on the resolution of image and proportions of editor areas. [Zoom bug.blend](https://archive.blender.org/developer/F9372427/Zoom_bug.blend) ![22222.png](https://archive.blender.org/developer/F9372428/22222.png)

Mousy commented

2020-11-25 14:03:54 +01:00

Added subscriber: @Mousy

Mousy changed title from ~~Image Editor fractional zoom does not display images correctly with some image resolution and configuration of the working areas.~~ to In 2.91.0 Image Editor fractional zoom does not display images correctly with some image resolution and configuration of the working areas.

2020-11-25 15:00:05 +01:00

Mousy commented

2020-11-25 15:34:53 +01:00

Additional demonstration of what's going on.

Additional demonstration of what's going on. ![zoom bug.png](https://archive.blender.org/developer/F9372922/zoom_bug.png)

Mousy commented

2020-11-25 18:26:05 +01:00

Update: It seems there is a bug only if the Windows Aero is not used. (Aero hurts eyes of some people. Please help!).

It turned out that Aero affects the vertical size of the window. Thus, it was found that the vertical size of the image editor affects the occurrence of the bug.

Update: It seems there is a bug only if the Windows Aero is not used. (Aero hurts eyes of some people. Please help!). It turned out that Aero affects the vertical size of the window. Thus, it was found that the vertical size of the image editor affects the occurrence of the bug.

Evan Wilson commented

2020-11-25 21:47:31 +01:00

Added subscriber: @EAW

Evan Wilson commented

2020-11-25 21:47:31 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Evan Wilson commented

2020-11-25 21:47:31 +01:00

By ‘Windows Areo’ do you mean the Window default mouse pointer arrow? If so, good catch!

I had this issue in one of my files recently, but it only occurred in that particular file. I don’t use the Windows default mouse pointer arrow. I closed the image editor and opened a new one (merge the window then split the window). This made the issue disappear for me. Does it work for you?

By ‘Windows Areo’ do you mean the Window default mouse pointer arrow? If so, good catch! I had this issue in one of my files recently, but it only occurred in that particular file. I don’t use the Windows default mouse pointer arrow. I closed the image editor and opened a new one (merge the window then split the window). This made the issue disappear for me. Does it work for you?

Mousy commented

2020-11-25 23:26:34 +01:00

In #82999#1061456, @EAW wrote:
By ‘Windows Areo’ do you mean the Window default mouse pointer arrow? If so, good catch!

I had this issue in one of my files recently, but it only occurred in that particular file. I don’t use the Windows default mouse pointer arrow. I closed the image editor and opened a new one (merge the window then split the window). This made the issue disappear for me. Does it work for you?

It turns out that Windows Aero (stylized windows interface) does not affect itself, but it slightly resizes the Blender window. The appearance of aliasing in this way depends on the size of the window, the position of the image in the image viewer, and the scaling of the interface.

> In #82999#1061456, @EAW wrote: > By ‘Windows Areo’ do you mean the Window default mouse pointer arrow? If so, good catch! > > I had this issue in one of my files recently, but it only occurred in that particular file. I don’t use the Windows default mouse pointer arrow. I closed the image editor and opened a new one (merge the window then split the window). This made the issue disappear for me. Does it work for you? It turns out that Windows Aero (stylized windows interface) does not affect itself, but it slightly resizes the Blender window. The appearance of aliasing in this way depends on the size of the window, the position of the image in the image viewer, and the scaling of the interface. ![изображение.png](https://archive.blender.org/developer/F9375498/изображение.png)

Mousy commented

2020-11-25 23:34:24 +01:00

A separate image editor window shows aliasing at 1: 1 scale due to its specific size.

A separate image editor window shows aliasing at 1: 1 scale due to its specific size. ![изображение.png](https://archive.blender.org/developer/F9375543/изображение.png)

Evan Wilson commented

2020-11-26 05:46:32 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Germano Cavalcante commented

2020-11-26 16:03:25 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-11-26 16:03:25 +01:00

I can't find a window size + image position that could result in this aliasing.
So I can't reproduce the problem.

Can you check if this result is also seen in older versions of blender?

I can't find a window size + image position that could result in this aliasing. So I can't reproduce the problem. Can you check if this result is also seen in older versions of blender?

Mousy commented

2020-11-26 16:47:18 +01:00

In #82999#1062169, @mano-wii wrote:
I can't find a window size + image position that could result in this aliasing.
So I can't reproduce the problem.

Can you check if this result is also seen in older versions of blender?

Rendered a black cube on a white background at 45 degrees. On the left is 2.91.0 with such a window size that the display at 1: 1 zoom is aliased. On the right is 2.90.1, which didn't have this problem:

Demonstration of how window size affects 2.91.0 and 2.90.1:
Zoom Bug.mp4
Scene used:
Zoom Bug.blend

> In #82999#1062169, @mano-wii wrote: > I can't find a window size + image position that could result in this aliasing. > So I can't reproduce the problem. > > Can you check if this result is also seen in older versions of blender? Rendered a black cube on a white background at 45 degrees. On the left is 2.91.0 with such a window size that the display at 1: 1 zoom is aliased. On the right is 2.90.1, which didn't have this problem: ![Zoom bug.png](https://archive.blender.org/developer/F9381760/Zoom_bug.png) Demonstration of how window size affects 2.91.0 and 2.90.1: [Zoom Bug.mp4](https://archive.blender.org/developer/F9381769/Zoom_Bug.mp4) Scene used: [Zoom Bug.blend](https://archive.blender.org/developer/F9381774/Zoom_Bug.blend)

Germano Cavalcante commented

2020-11-26 17:49:58 +01:00

Added subscriber: @Jeroen-Bakker

Germano Cavalcante commented

2020-11-26 17:49:58 +01:00

I don't know how to proceed from here. (Can't replicate).
@Jeroen-Bakker, this may be related to the drawing changes in the image editor.
Do you have any idea what's going on?

I don't know how to proceed from here. (Can't replicate). @Jeroen-Bakker, this may be related to the drawing changes in the image editor. Do you have any idea what's going on?

Mousy commented

2020-11-26 18:46:52 +01:00

Also with the latest nvidia driver 457.30 all the same: the vertical size of the Image Editor and/or a certain scale of the Blender interface result in a bug at some resolutions. At 1024x768 I can easily reproduce the bug, but at 1000x700 is not, also aliasing appears at 768x512 when the Blender window is maximized. And the result of rendering 640x480 for any window size looks like this. But the image itself is correct if you save it to a file.

Also with the latest nvidia driver 457.30 all the same: the vertical size of the Image Editor and/or a certain scale of the Blender interface result in a bug at some resolutions. At 1024x768 I can easily reproduce the bug, but at 1000x700 is not, also aliasing appears at 768x512 when the Blender window is maximized. And the result of rendering 640x480 for any window size looks like this. But the image itself is correct if you save it to a file. ![1.PNG](https://archive.blender.org/developer/F9382408/1.PNG)

Vyacheslav Kobozev commented

2020-11-26 23:20:43 +01:00

Added subscriber: @Vyach

Vyacheslav Kobozev commented

2020-11-26 23:20:43 +01:00

Win7, same issue
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Win7, same issue Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Germano Cavalcante commented

2021-01-22 15:50:38 +01:00

Closed as duplicate of #83529

Germano Cavalcante closed this issue

2021-01-22 15:50:38 +01:00

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In 2.91.0 Image Editor fractional zoom does not display images correctly with some image resolution and configuration of the working areas. #82999