Bitmaps appear blurry in swift 3d

I’m using swift 3d. I’m making a box with a different bitmap image on each side. When I apply the bitmap images, they appear blurry. Anyway I can improve the quality? I saved bitmaps are .jpgs set at high quality in photoshop. Is there anyway to determine the size of the box faces in pixels so I can match the size in photoshop?