At 8.3 x 11.7" (210x297mm), A4 paper is slightly narrower and a little longer than "A" size 8.5 x 11" paper (216x279mm). The A4 is part of the ISO "A Series," where A0, the first dimension ...

Feet should not go out of the paper. Currently A4 size printer paper has ben chosen as reference. To fit all sizes, A1 paper can be taken as reference. If there is no closed curv after edge detection, ...