recentally i have been accepted to display art in 2 local coffee shops, that being said i need to get my pictures to print right... I have an HP Photosmart 7450, which prints up to a maximum of black render dpi: 1200 and a color render dpi:1200. Color output at 4800 x 1200 optomised dpi. ive tryed many different settings and all of them have been pixelated. I dont know what could be going wrong... Please help photo gods!