I am using the full paid windows version, and don't have a preferences tab or button.  When you to to file / export->to images you get a dialog which allow you to select the dpi resolution and quality.  higher dpi = higher resolution of image and requires higher resolution images for clarity.  There is also a "quality" slider, which I have always assumed invokes a compression utility, so I always slide it out to "high".

The adjustments in CL are context sensitive in that if you double click an image in one of the panels of your workspace, the style selector changes to image styles (these are the adjustments you mentioned before to alter an image with various art effects).  When you have the focus on a balloon, the style selections are for balloons, and so on.

Hope this helps.

Klebnor

Lotus 123 ~ S-Render ~ OS/2 WARP ~ IBM 8088 / 4.77 Mhz ~ Hercules Ultima graphics, Hitachi 10 MB HDD, 64K RAM, 12 in diagonal CRT Monitor (16 colors / 60 Hz refresh rate), 240 Watt PS, Dual 1.44 MB Floppies, 2 button mouse input device.  Beige horizontal case.  I don't display my unit.