Export artifacts - grey bands

[lysynski]

1. Photo V2
2. v 2.1.0
3. yes, on more than 1 image
4. happens with existing image (attached)
5. File> export; document flat file type such as JPG; preview will show grey bands on RHS; exported image will have grey bands

Emilie_032406.afphoto

[carl123]

Not seeing any "bands" on the right right-hand side

A screenshot of the "bands" might have confirmed the issue, but try...

Edit > Preferences > Performance

and switch off "Hardware Acceleration"

[NotMyFault]

I can reproduce the issue on iPad.

it starts when opening the file, for a split second a gray rectangle is shown.

the when using export preview you get a rectangle in the upper right area.

The file is probably damaged in one of the layers, could not find one yet.

 

[Return]

Sorry but not seeing this on win11.

[NotMyFault]

The „Pixel“ layer (selected in layer stack in screenshot) is the one causing the issues (having a nested mask layer). Get lots of rendering issues when zooming.

it seems multiple layers are redundant, containing the same content.

Assuming an isolated corrupted file here. We had similar rare cases in the past. As Windows / Intel normally doesn’t support ECC on consumer devices, memory corruption can happen unnoticed.

[NotMyFault]

More details: the mask has opacity reduced to 60%. 

• this may cause the issues (Affinity to check)
• i generally strongly advice against fiddling with layer parameters of mask layers (blend mode, opacity, etc). Most do not work, and mask layer opacity is simply passed to the parent layer which can be very confusing to understand and analyze (e.g. multiple hierarchy levels, multiple mask layers).
• iPad has a bug not showing opacity correctly for nested layer. You need to unnest the mask layer to see the actual value.

[lysynski]

Thanks for the feedback. @NotMyFault comments and observations reinforce that there's a bug in the rendering of layer information/data.

Something else to note, I'm also using a Mac Mini M1 and that @NotMyFault also observes the problem on iPad (but not on Windows) the bug appears to be Apple OS related - my 2 cents.

[lysynski]

BTW - turning off hardware acceleration makes it worse; band now appears in the native format.

[NotMyFault]

I have reduced the file to the essence and recorded how the issue starts when zooming. 

The mask layer with 60% opacity gets falsely propagated to parent layers and leads to erratic 60% opacity (153/255 = 0.6), evidence is info panel and channels panel.

Tested on Mac mini M1 (2020) with latest OS.

Issue happens with passthrough or normal blend mode on groups.

video mildly nsfw

Spoiler

video

 

end video

 

 

Edited June 18, 2023 by NotMyFault
Needed to delete attachments for capacity reasons. Available on request.

[NotMyFault]

I can reproduce the same bug with a new file from scratch, with a similar layer structure.

trigger condition: continuously zoom in and out. First the rectangles vanish, but after some time they stay, even when exported, merge visible, etc.

 

Affects MacOS and iPadOS, Photo Only.

Designer does not show the bug when using identical files.

MacOS V210 mask 60 pc bug.afphoto

[lysynski]

Yes, that’s it. I haven’t tried zooming in/out to trigger it. I have a some images that also react the same way with Merge Visible.

[Callum]

Hi All,

I have logged this as a bug to be investigated further by our dev team. I'll update this thread once I have more info

Thanks
Callum

[lysynski]

Has there been an update on this? Nothing on this thread, it'll be 6 months soon from original post.

Thanks

[NotMyFault]

Well, there is an easy workaround: don’t reduce opacity of mask layers.

instead, you have multiple other methods to get the same effect:

• reduce opacity of enclosing group or layer
• add levels adjustment, reduce white output on alpha channel
• Use blend range, reduce both nodes to desired level (flat line).