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P: Photoshop 27.8 & later Rendering Artifacts, Exposed Previews and Color Banding

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Hello,

I have encountered what appears to be a GPU-related rendering bug when converting RGB images to CMYK in Photoshop.

System

Photoshop 27.8
macOS Tahoe 26.5.2
Mac Studio M2 Ultra
Apple Silicon GPU

Problem

Whenever GPU acceleration is enabled, converting an RGB image to CMYK produces severe black rendering artifacts across the image. The artifacts appear immediately after the color conversion and make the document unusable.

The issue occurs with multiple images and is fully reproducible on my system.

Steps to Reproduce

Open an RGB image.
Make sure Use Graphics Processor is enabled under Preferences > Performance.
Convert the document to CMYK (either Image > Mode > CMYK Color or Edit > Convert to Profile).
Large black artifacts appear throughout the image.

Expected Result

The RGB image should convert normally to CMYK without any visual corruption.

Actual Result

The converted image contains large black rendering artifacts that were not present in the original RGB document.

Workaround

Disabling Use Graphics Processor completely resolves the issue.

After restarting Photoshop with GPU acceleration disabled, the exact same RGB image converts to CMYK correctly with no artifacts.

Additional Information

The problem started recently. Earlier Photoshop versions on the same hardware did not show this behavior.
The issue does not appear to be related to a specific image.
Since disabling GPU acceleration immediately fixes the problem, this seems to be related to Photoshop's Metal GPU rendering pipeline rather than the color conversion itself.
I can provide the original RGB file, the corrupted CMYK result, screenshots, the GPU Compatibility Report, and the Photoshop System Information if needed.

Has anyone else experienced this issue on Apple Silicon Macs, particularly on an M2 Ultra?

Thank you.

Adobe PS Bug Report.txt

Pinned Reply By Srishti Bali

Hi everyone,

I have an update from the Photoshop team. A fix for this color-rendering issue is now available in the latest Photoshop v27.11.

For users on non-HDR displays who are still seeing the incorrect color, please turn off Preferences > Technology Previews > Precise Color Management for HDR Display. This is currently required to achieve correct color rendering on affected non-HDR setups, even with the fix in the Beta.

If you are using an HDR display or have HDR enabled at the operating-system level, please keep this setting enabled.

Thank you, everyone, for the detailed reports and testing.

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Anshul_Saini

Community Manager

Hi @Rostrobowitsj,

Thanks for reporting this. Could you please share:

• Your full System Info, Photoshop > Help > System Info and Copy & paste it here

• A screenshot showing the issue. Ideally, with the same file displayed in Photoshop with GPU enabled and disabled

• If possible, a sample PSD file that demonstrates the problem.

A few additional questions:

• Does this happen with all PSD files? Or only specific files?

• Does it affect JPEGs, PNGs, TIFFs, or other formats as well?

• Are you using any custom monitor profiles or calibration software for the Eizo display?

Once we have the System Info, screenshots, and a sample file, we can forward them to the product team for further investigation.

Best,

Anshul Saini

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Rostrobowitsj

Participant

Right after the june 18 2026 Photoshop update , the colours of every .PSD that I open are WASHED OUT!!! If, in Photoshop-preferences I disengage the “Use Graphics Processor” colours look allright again….. My set up is an iMac Pro ( 2017 ), connected to an Eizo-monitor.