P: Vertical lines appear when using a brush.

[vickim68445947]

I make a 12X12 inch canvas, and paint with a brush. It appears to make vertical lines on the canvas.

[vickim68445947]

" It’s just that not everyone needs this function; most users don’t even know what color dynamics are." You do not even need to know what color dynamics are to have the problem. If you use a brush, download a brush, or purchase a brush that has color dynamics turned on, and a flow less than 100, you would have the problem. Well, now it is fixed. Hopefully it will stay fixed. I DO use color dynamics, it is a great feature.

[Chad Rolfs]

We appreciate your patience while we fixed this.  It was a nasty bug and easy to repro so we could turn around a fix relatively quickly.  We're working on adding a case to our automation testing so that if this ever breaks again, we'll know asap and not let this get out to you, our customers.  Thanks again and apologies that this broke in the first place. 

[vickim68445947]

 Thank you SO much for fixing this! I love my brushes, I NEED my brushes! All good here now!!!

[CoryShubert]

Thanks @Chad Rolfs and everyone for your patience.

Thanks,

Cory - Photoshop Product Manager

[AlphaSnowLion]

The default circular brush (with adjustable hardness) produces artifacts everywhere that resemble blocky vertical lines. This always happens around the right edge of the brush stamp at the given time and place, as well as at seemingly fixed columns on the canvas. So far this only seems to happen with the default round brush, and not any other custom brush. Also only the regular Brush seems to produce these artifacts, things like the Mixer Brush or Eraser don't (or any other tool that can use the same brushes as a stamp) 

These artifacts appear when I use the default round brush with the following details:

• The flow for the brush is less than 100%. Opacity doesn't matter
• Using either the mouse or a drawing tablet
• Document bit depth is 8 or 16 bits. Changing color mode doesn't affect it, however in RGB 32-bit mode the issue is gone
• And/or any of the jitter sliders in [Brush Settings --> Color Dynamics] are set to anything above 0%. If I leave Color Dynamics sliders with as few % and set Flow to 100%, the issue is gone. If I leave Flow at let's say 50% and turn off Color Dynamics (or move the sliders to 0%) the issue is gone again. But I want to use both at the same time so this doesn't really help me
• Toggling other brush settings don't seem to change anything in this issue. First I thought it was a texture problem, but it isn't

Current behavior: notice all the vertical, pixelated lines

Expected behavior: no vertical lines, just the soft brush strokes (this was made in 32 bit mode solely for comparison)

Troubleshooting steps so far, none of which helped:

• Update Photoshop
• Update GPU driver
• Reset Brush tool settings
• Reset Photoshop settings
• Try using the brush in brand new and old documents
• Uncheck "Use GPU" in [Photoshop settings --> Performance]
• Disable Native Canvas in [Photoshop settings --> Tech. previews]
• Plugging my monitor into the motherboard for it to use the iGPU instead
• Not undervolting the GPU (see below)

Specs:

• Photoshop version: v25.5. I first noticed this problem on v25.4. This definitely wasn't an issue on v24.1.0.166 yet
• OS: Windows 10 Pro 22H2 19045.4046
• GPU & driver: PowerColor 6900XT Red Devil with AMD Adrenaline 24.2.1 driver. I udated from 24.1.1 yesterday after noticing this problem. The issue is the same with both driver versions. ReBAR is enabled. GPU is undervolted to 95% (default is 100%)
• CPU: Intel Core i5-12600K, stock with power limits removed, and PL1 duration set to max. (~452s)
• RAM: Kingston Fury Beast DDR4 2x16GB 3200MHz CL16 (running XMP1 profile)

[davescm]

This issue is supposedly fixed in v25.6 latest Beta (although I don't seem to be able to reproduce it now in release version 25.5)

See this thread:

https://community.adobe.com/t5/photoshop-beta-bugs/p-vertical-lines-appear-when-using-a-brush/idi-p/...

Dave

[chad.rolfs]

@AlphaSnowLion Please update to 25.6.

[CoryShubert]

Hey all, we have a newer Ps beta: Adobe Photoshop Version: 25.9.0 20240417.m.2590 45fa5ee arm64

Please download to make sure you have the newest build.

Thanks,

Cory - Photoshop Product Manager