Sharing screen grabs and screencasts is a great way to show someone exactly how to do something with their Macs. You've got several choices for screencast software (here's a list of posts in our screencast category), but snapping a simple screen grab is much simpler.

Using Apple's Grab application you have a few options:

1. Shift + Command + 3 produces a snapshot of the whole screen
2. Shift + Command + 4 produces a crosshair that you can drag over a specific area of your screen
3. Shift + Command + 4 followed by the space bar turns the crosshair into a camera

Number three will let you grab a single window. The problem is that it includes that window's shadow, which you might not want. Fortunately, MacOSXHints has described how to exclude the shadow. A single line typed in the Terminal will get the job done.

That's great and all, but for some real fun, take a screenshot of a collegue's desktop, move all his desktop icons onto his hard drive, set your screenshot as the desktop image and feign ignorace while he clicks furiously on his "icons." You're welcome.

Whether you want to post something to a web page or blog, or show off an application element in a presentation, taking quality screenshots is becoming an increasingly common task for lots of different Mac users. Although OS X comes with its own built-in screenshot utility, Grab, and onboard F-keys for the task, there are lots of third-party options as well. Contrary to popular belief, not all screen capture applications are created equal.

So what program is the best for taking quality screenshots off of your computer? To find out, I put five screen capture programs through their paces to try to find the "ultimate" screen-capture program.

The programs I used:

• Grab - built into OS X
• Skitch - free (at least while in beta)
• Snapz Pro X - $29 for image capture only, $69 for image and motion capture
• InstantShot! - free
• QuickSnap - $14.95

Read-on for my analysis and take a look at the gallery for screenshots from each program, as well as head-to-head comparisons.

GrabUp is an interesting little app that adds a new wrinkle to OS X's built in screen capturing functionality. When you install the prefpane, it allows you to add the GrabUp menu item to your menu bar. GrabUp just sits waiting for you to invoke it (by hitting Shift - Command - 4). Once you hit the key combo a crosshair pops up, letting you select part of your screen to capture. So far this is pretty standard stuff. The image is saved to your desktop and uploaded to GrabUp's server (like this) and the URL is automatically copied to your clipboard. The idea is that this will make it very easy to share screen captures over IM or email since no account is needed. The app just uploads the image and returns a unique URL.



It isn't as robust as Skitch or ImageWell, but its beauty is in its simplicity. You don't need to have an FTP login or Flickr account to upload your picture to the web, and that is pretty compelling. The only question I have is: does it scale? What happens when thousands of people are using this app?

Thanks to everyone who sent this in.

TUAW reader Jakob writes that he often uses OS X's "Print as PDF" feature. He asks if there's a way to print only part of a website by dragging out a selection rectangle?

Yes, Jakob, there's a very simple way. Yesterday, I posted a Terminal Tip about using OS X's built in command-line screencapture utility. What I didn't mention in that post was that screencapture allows you to grab your shots in PDF format. To use the mouse to capture a rectangle from the screen and then save it to PDF, just issue a command along the following lines:

% screencapture -i -s -tpdf ~/Desktop/foo.pdf

And if you're not big on using Terminal and the Command line, here's another way to approach the problem with Grab. Launch Grab from Applications/Utilities and choose Capture -> Selection. Use the cross hairs to select part of the screen and then print the results to PDF (File -> Print, then PDF -> Save as PDF).

If you need to capture more data than a single screen will allow, consider Paparazzi. It's a donate-ware utility that allows you to enter a URL and a screen size. It loads the web page from the URL you provide and produces an image from that data--regardless of whether you'd have to scroll the screen to see the entire page in a normal web browser. No, it won't save to PDF, but it's pretty easy to convert the images if you have to. Update: The latest version of Paparazzi will save to PDF including searchable text.

In a follow-up message, Jakob mentioned that he's really interested in producing a searchable result. Sure you can save to a web archive but both web archives (use File -> Save as or File -> Save Page as or the equivalent in your favorite browser) and his current method of printing to PDF create pretty big files, even if they are searchable. So here's my final recommendation: invest in Acrobat, not just in Acrobat Reader. In Acrobat, use Document->Extract Pages to save only those portions of the web page you want to keep and delete the rest.