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przemek265
User level: Level 1 (4 points)

Photos appear brighter and greenish after macOS 27 upgrade with ColorSync errors

After upgrading from macOS 26 to macOS 27, photos appear noticeably brighter and slightly greenish in Photoshop, Preview, and Safari. The issue affects both the built-in MacBook Pro display and the external EIZO CS2740 monitor.

The same photos appear darker and more neutral in Epson Print Layout, matching their appearance on Windows. I have checked the display profiles, True Tone, Night Shift, Photoshop color management settings, and GPU settings. Switching the EIZO display profile to sRGB did not resolve the issue. Updating to macOS 27.0.1 also made no difference.

I also checked the appearance of a screenshot on a Windows computer. The screenshot, the photo displayed in Preview, and the image shown in Epson Print Layout appeared consistent with the darker, more neutral rendering seen in Epson Print Layout. This suggests that the issue may be related to how macOS 27 or individual applications render colors on the display, rather than a problem with the original image file.

ColorSync Utility reported 92 profile verification errors, including errors involving Adobe, EIZO, and printer/paper profiles. I would like Apple to investigate whether macOS 27 has introduced a bug affecting ColorSync, ICC profile interpretation, or color rendering across applications.

Could you please advise how to resolve this issue without downgrading to macOS 26?

Posted on Oct 18, 2026 9:15 AM

1 reply

neuroanatomist
User level: Level 9 (72,871 points)

Oct 19, 2026 12:26 PM in response to przemek265

To address brighter and greenish color rendering after upgrading to macOS 27, you can test specific workarounds related to GPU acceleration, monitor profile generation, and application-level color management.


Potential Workarounds:


Disable GPU Compositing or Graphics Acceleration in Photoshop:

Similar to past rendering bugs on Apple Silicon, turning off graphics acceleration can force CPU-based color rendering and bypass display shader glitches. Go to Photoshop > Preferences > Performance and uncheck Use Graphics Processor (or disable GPU compositing/OpenCL depending on your exact version), then restart the application.


Regenerate Custom ICC Profiles with Hardware Calibration:

Because ColorSync reported multiple profile errors, delete or bypass corrupted user/system ICC profiles. If you use EIZO ColorNavigator for your CS2740, run a fresh hardware calibration to create a brand-new ICC v2 or v4 profile, and explicitly assign it in both macOS Display Settings and EIZO ColorNavigator rather than relying on generic sRGB fallbacks.


Test Soft-Proofing or Custom Display Presets:

In applications like Preview or Safari that lack manual ICC override controls, check if turning off automatic high-dynamic-range (HDR) or ambient color adjustments (such as disabling Reference Mode or switching the built-in display profile from XDR/Apple-native presets to a standard 6502K/sRGB-emulated profile) restores neutral tones. 


Use Print/Layout Apps as a Baseline:

Since Epson Print Layout bypasses certain OS-level CoreGraphics/ColorSync preview pipelines by rendering directly through its own engine, export or convert tagged files using a validated working space (such as Adobe RGB or sRGB IEC61966-2.1) embedded explicitly with the profile intact.


More info from Apple: ColorSync Utility User Guide for Mac - Apple Support


Originally posted at discussions.apple.com/thread/256378439