The fonts will scale smoothly and most of the UI elements scale smoothly. Of course, the icons may look a bit blocky and some of the UI elements don't look right around the edges, but I've scaled everything uniformly. Now when I launch the program I want to capture, it is much bigger. Then I slide the slider up to 1.25 or maybe 1.5 and stop. I open Quartz Debug (from /Developer/Applications/Graphics Tools/) and choose 'UI Resolution' from the Window menu. You'll need to have Xcode installed to do this. Instead I make use of this hint for a different purpose. For many programs I find it time consuming and annoying to try to change all the fonts and preferences to make the text larger, and even if I do, the UI elements will be out-of-proportion to the text. If I take a screen capture of the 1000x800 pixel window, and then I scale it using a raster graphics program, the text gets scaled and jaggy, along with the UI elements. Certainly the icons and such don't scale. If I have a window, say the Eclipse IDE, that looks good when it's, for example, 1000x800 pixels in size, it tends to just fill up with white space if I stretch it out to 1600x1050 (the size of my monitor).

Here's the problem: I want a screen capture with as many real, useful pixels in it as possible. This hint tells you how to scale the window itself, so you get a better screen capture. Although my monitors are big, if I stretch a window out very large, that doesn't make the text, buttons, or menus bigger. Sometimes I want to get a higher resolution screen capture so I can include it in a printed document.

Screenshot in mac os x 10.6