X mind 8 : adding personal markers

Hi,

adding personal markers is a great feature, available in the free version. I tried it, but the result is not always good. You can compare Xmind orignal markers and personal markers. These markers are really good definition, but when added on the map, they are very pixellised (see picture joined, pen and basket-ball).

Which rules have we to respect to have well definition, like original markers ?

Thank you

Franck