[Plugin: NextGEN Gallery] photo resizing and PicLens

Hi every body, I can’t figure out how the re-size Image option work in regards of PicLens visualisation of the pictures… I load image at 1280px x 1024px to get a good resolution when viewing them with PicLens but then those images are too large when viewed with the lightbox.
When I re size them images to 600px x 400px It reduces the size of image in the lightbox at a proper viewing size with the Lightbox but then images lack of resolution when viewed with PicLens..
Is it the way it works or am I wrong in my settings somewhere ?