Sure ... two that impressed me are: Genuine Fractals by LizardTech - http://www.lizardtech.com/ It uses fractal math to calculate the resizing (you save the image out at full size under their format and when you load it back in, you can set the size to whatever you want). XFile by HumanSoft - http://www.humansoftware.com As for the math, it only looks complicated. It really just comes down to every time you halve the ppi you halve the image size. As long as you remember that you'll be fine. :) -=>Donald