already got it Rated 5 out of 5 stars
ok forget it, "great" was not the ideal word ... Anyway, I renamed the image from PNG to JPG and it worked: D
PS: here are the 5 stars;)
First thanks for the update & higher rating! I'm a bit surprised - renaming png to jpg would not actually change an image's format. Your image program might open it fine if it can open both png and jpg files AND knows to check image header first (most modern image programs do that). But some image programs will complain that the file is actually a png file incorrectly named jpg. So are you sure this renaming way fits your need?