Pixels disappeared during painting

[Sami H]

Hi,

I was using some a brush in AD and suddenly few pixels disappeared as you can see in the picture attached, I tried to undo closed the file and reopened it however the that area seemed just white and I can paint over it.

Please let me know how it happened and if there is a way to avoid it.

I'm using m1 MacBook Air, Monterey 12.5

Thanks

[NathanC]

Hi @Sami H welcome to the forums,

I've noticed that the pixel layer thumbnail within your layer stack doesn't appear to show the missing pixel information within that area, if you were to move the Pixel layer outside of the Rectangle and remove the rectangle from the Artboard does the missing area re-populate?

If it doesn't, could you confirm the below:

• What Brush were you using which caused this?
• Is Hardware Acceleration Enabled? (Edit > Preferences > Performance)
• Could you provide us with a copy of the file (A private dropbox link can be provided if required)

[walt.farrell]

@NathanC: possibly a version of this known issue? 

 

 

[NathanC]

27 minutes ago, walt.farrell said:

possibly a version of this known issue? 

Thanks @walt.farrell it looks incredibly similar to that issue. I've not been able to re-create this using a pixel layer nested into the rectangle on an Artboard yet which I would've expected to cause the issue since it's acting as a container similar to a group.

Hopefully it will become more clear if I can take a look at the file 🙂

 

[Sami H]

Hi Nathan,

Sure I can send you the file. I removed the pixel layer but nothing happened

• What Brush were you using which caused this? one of the Oils no sure
• Is Hardware Acceleration Enabled? (Edit > Preferences > Performance) YES

Asrtroid.afdesign

[NotMyFault]

The file, opened in Photo and using the channels panels, shows some areas with alpha below 1, especially in the defect area, but elsewhere, too.

You can achieve full alpha by channels panel, right-click on pixel layer alpha, and fill. Unfortunately the color information is still lost in the affected area. Damage is permanent unfortunately.

 

So it is not a rendering issue, but a more severe damage.

The thumbnail probably showed cached information just before the issue hit, not the actual pixel layer data.

 

PS: the symptoms remind me more on this bug known from iPad OS: