Change the background to display PNG images with transparent backgrounds

[SoCu]

Hi, I have PNG images with transparent backgrounds. These images have a barely visible white border—they’re masks. They would look better if, instead of showing the transparent background, they displayed a different color, such as black.

How can I change the background color—not for the entire app, but only when viewing images with transparent backgrounds—so that it doesn’t display that grid of white and gray squares?

Thank

[user0]

change Transparency grid color to black-black in Settings>View

[SoCu]

Thanks user0, that information is what I found, but it said to set a solid color, and I was doing it wrong, I was deactivating that option