1. Download and install Onde screen capture for Mac(www.ondesoft.com/screencapture/indeex.­htm­l ,run it.

2. Please make sure that the freehand region that you want to capture is visible on your monitor.

3. Click arbitrary icon on your capture panel or use tray icon to select it. There are two options available to choose irregular region:

1) Point-to-point selection: Select points to define capturing region.
Locate the irregular selection cursor on the first point where you would like to start to capture and relax mouse to the next point. You can click as many points as you like. The screen capture for Mac will connect the points with straight lines. Screen magnifier can be used to magnify cursor’s location to help capture accurately.
Close the path when final point and first point coincide which is indicated by a red circle and end the selection process.
2) Freehand Selection: you can simply click and drag to make a selection.
Locate the irregular selection cursor on the first point where you would like to start to capture and then press and hold the mouse to draw lines as you like. Screen magnifier can be used to magnify cursor’s location to help capture accurately.
Close the path when final point and start point coincide which is indicated by a red circle and end the selection process.
4. If the selection region is exactly what you want, then click “Snap” or 'Enter button' to complete capturing.

5. After grabbing images, you can edit with some handy tools like drawing attention with arrows and colorful shapes, adding textual comments and etc. Pencil editor is also supported.

6. Then preview the modified screen shots, you can save it to the default path or the output file which you select.