I want to make a Wario Ware DIY game with Mario Sprites, and I am trying to draw the background. As it turns out, the sprites are way too big to fit on my DS screen, and I tried to scale the map that I amusing to copy on my computer down with Photoshop CS3 to format it to my DS (Please take note that I have a Mac). However, when I scaled it down, it was incredibly blurry and blocky, instead of crisp and detailed as the original map should have been. So, how does one proportionally scale a PNG formatted map down to size without it looking blurry and ugly? It would be much obliged for an answer, as I can't find any help with the "Help" bar in the tool bar, and I can't find an answer online.

Thanks.