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media scaling incorrectly, even local images opened in a tab

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All images, webm, gif etc. are loading, seemingly, exactly 20% upscaled compared to the real resolution of the media. I'm using a 4k TV (S95B), but I have desktop scaling at 100%, and browser scaling at 100%. I don't believe it's a GPU or OS system wide type setting because windows photo viewer gets pictures right. I'm using ShareX to measure the pixels of pictures. I can even load a local picture in a tab, and it will be upscaled beyond its native resolution. I have no idea why. I've tried a bunch of things, like setting layout.css.devPixelsPerPx to 1.0, which did nothing. I've reset Firefox to no avail, and I have noticed that Chrome is doing the same thing, which would usually indicate it could be the OS or GPU driver, but again, other apps load images perfectly normally. Do apps have categories on Windows now, where something like a "browser" can be told to treat media files differently than other media handling categories? I'm really lost at this point, nothing seems to work.

All images, webm, gif etc. are loading, seemingly, exactly 20% upscaled compared to the real resolution of the media. I'm using a 4k TV (S95B), but I have desktop scaling at 100%, and browser scaling at 100%. I don't believe it's a GPU or OS system wide type setting because windows photo viewer gets pictures right. I'm using ShareX to measure the pixels of pictures. I can even load a local picture in a tab, and it will be upscaled beyond its native resolution. I have no idea why. I've tried a bunch of things, like setting layout.css.devPixelsPerPx to 1.0, which did nothing. I've reset Firefox to no avail, and I have noticed that Chrome is doing the same thing, which would usually indicate it could be the OS or GPU driver, but again, other apps load images perfectly normally. Do apps have categories on Windows now, where something like a "browser" can be told to treat media files differently than other media handling categories? I'm really lost at this point, nothing seems to work.

Valittu ratkaisu

Upon deeper search, I discovered that the Windows option "Accessibility > Text Size" is effecting much more than just text. It is upscaling my images across many different applications, including browsers, but also things like Mozilla Thunderbird. Really, who knows what else it's scaling up.

I have since set it to 100% and images are now scaled appropriately. I will also submit feedback to Windows that this is occurring.

Thanks for your response.

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Valittu ratkaisu

Upon deeper search, I discovered that the Windows option "Accessibility > Text Size" is effecting much more than just text. It is upscaling my images across many different applications, including browsers, but also things like Mozilla Thunderbird. Really, who knows what else it's scaling up.

I have since set it to 100% and images are now scaled appropriately. I will also submit feedback to Windows that this is occurring.

Thanks for your response.