right, it's been ages since I've done serious rendering in Bryce that I completely spaced on the 'render to disk' having a dpi setting.

but all it does is set that flag in the header of the resulting image file.

one caution about changing dpi in photoshop -- when you do it, make sure that you've unchecked the 'resample image' checkbox (otherwise, changing the dpi will also adjust the number of pixels to keep the 'image size in inches' the same).

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Check out my Elemental Hexagons deck, created with Photoshop, Bryce, MojoWorld, and Poser