My image is allegedly 320x312p. With my one line of text, I should be just under the height limit, at 322p. but the page says "Your current signature is 44 pixels tall". So I can't be certain if my signature is within the limits!

That height thing has been broken for years and isn't reliable, I don't even know why they try to enforce it with that thing or even have it still with larger screens and faster internet.

Go by your picture height and add 10px height for each line of text.

[edit]This isn't trying to do the mods' jobs, this is just a good rule of thumb to follow the guidelines on something that Subeta seems to have kept inaccurate for years?? If it doesn't register right, why is it there.

Thanks, I haven't had an image this close to the size limit in a while, and I hadn't noticed it was so off!