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In 12 years of using Photoshop I've never seen an issue like this.

I have a picture. When I choose Vɪᴇᴡ ▶ Aᴄᴛᴜᴀʟ Pɪxᴇʟs the image is displaying incorrectly on my monitor. On the left is what my image looks like (zoomed up by a factor of 4 using nearest-neighbor). On the right is a screenshot of what it looks like when displayed at "Actual Size" (also zoomed up).

Actual result shows some blurred pixels

What setting could possibly be causing this?

Photoshop CS4 on Windows 7x64, on a machine with multiple graphics cards by NVIDIA.

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up vote 3 down vote accepted

Found it! I had recently used the NVIDIA Control Panel to force FXAA on for every application. Apparently this anti-aliasing was being applied to the images 'rendered' by Photoshop.

Using the Control Panel to exempt Photoshop from this (and all anti-aliasing, for safety) fixed the problem after a restart of the app.

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