Blurry png pictures

It seems png pictures are blurry in TeXmacs (This picture is not blurry in, for example, word):

in TeXmacs

in word

How to fix this?

OK, I figure out that TeXmacs automatically scales the picture. For example, If I insert the picture directly, I get

Alternatively, if I manually scale the picture to its original resolution:

everything is perfect:

How can I make this behavior automated in TeXmacs?