Hi, I have a DELL XPS15 with an OLED 4K display. After installing Photoshop, the display of shadows bug and is no longer fluid. Red and green pixels appear in the shadows, and the tone changes are in the shape of pixel stairs.
Can you help me ?
Could be a buggy video driver, but it sounds more like a defective monitor profile to me. A screenshot would help.
If you're not using a calibrator (which is what Photoshop is designed to work with), Dell and some other manufacturers distribute their own monitor profiles through Windows Update. Dell is notorious for shipping bad profiles, along with Samsung, Acer and Asus.
If disabling GPU doesn't do anything, replace your current monitor profile with sRGB IEC61966-2.1. It won't be entirely accurate, but better than a broken profile. Relaunch PS when done, it loads the profile at application startup.
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