[Wine] RESOLUTION: pictures appear pixelized

[kblo]

hi!
i'm trying to use PHOTOSCAPE through wine on ubuntu. 
i have a 13.33 (1366 x 768) screen, 118 dpi, and i set this up on wine config.
although, when i zoom in an image on photoscape, it appears in a worse resolution it does through ubuntu default image viewer.

can anybody tell me why? i swear i've searched quite a lot about "resolution" through forums, but everybody is complaining about games being slowed down, or configs being forgotten after fullscreens.
and that's not what happens to me.

the images in photoscape appear in the correct size, by the way.
the right same size as ubuntu viewer, under the same zoom scale. but "sharpened", or pixelized, as if they came from worse resolution files.

thanks