Why is BMP image height & width capped at 65535 pixels?

[smorokin]

Hello,
is there a reason why when reading the BMP header the image width and height checked to be less then 65536 pixels each.
Wikipedia claims that BMP image width or height could be up to 2³¹-1 each, but as i understand it their product must also be less then 2³², so I assume thats where the 65535 limit comes from (sqrt(2³²) = 65535).
I would like to propose to change the check to height and width <2³¹ each and height * width < 2³², but wanted to know if there are some other limitations that I have not found, first.

[JimBobSquarePants]

It's because early bitmap versions only allowed 2 bytes max per dimension. We should actually update the rules to max out based upon the header version. Happy to accept a PR if you're keen.

[smorokin]

I have created a PR draft #2192 . Is a test neccessary?

[smorokin]

Oh, sorry, I have missed the "based upon the header version". I will have another look