MrSpiggott

Sorry about that. I was confidently banging on about an untested theory, which is never a good idea. It scales in all directions so I...

you mean this one?

I've remembered a web site I saw a few years ago that generates full screen test patterns at whatever resolution you've set your output...

I forgot that consumer oleds do that, but for the purposes of diagnosing @Cyan scaling problem, it's better to turn it off.

That's interesting. Why do you have black borders? I think the reason you can't see a difference between the two images and resolutions...

In that case you're only scaling vertically, and the image data doesn't change in that axis. Therefore no artifacts.

Somethings wrong, you shouldn't see any blocks or stripes if you're outputting the 3840 image at 3840 resolution. You are looking at...

My previous image was actually 2048 vertical. Doh. I'll add two here. These .png's compress down nicely so filesize isn't an issue. ;)

No, I work in broadcast so use hardware test pattern generators. Many years ago when interfaces were still analogue, there used to be...

Surely this .png viewed full screen would be enough for a basic consideration without needing an app? It's 4096x2048 alternating...

Downscaling to is much trickier than upscaling where you have extra destination resolution to help in the process, particularly when...

Your 4K TV's native resolution is 3840 x 2160 which is four 1920 x 1080 screens worth of pixels. (The first 4K TV I used required four...

He's said that about everything he's made, "we learned a lot", because he's a genuine engineer and not a corporate mouthpiece. You get...

They had no reason to be excellent quality, just good enough. The analogue output stage of an arcade PCB was far simpler, and much...

Memory at the time, both working and storage, was a real cost bottleneck. So think of it like a form of compression. You draw the image...