Follow these instructions to configure Snagit or Fullshot (which are the 2 leading screen capture utilities).
Changing FullShot's Balloons
Open FullShot. Set this bar to be:
- Object transparency opacity: 90%
- Fill color 1: white
- Fill color 2: grey - 25%
- Line color: red
- Line width: 1px
- Font color: black
- Font family: arial
- Font size: 14px
In FullShot, you should get the setup above by making only 2 changes from the default: "Fill color 2 " and "Line width".
Once this is done, close FullShot and re-open it.
Figure: Fullshot bar following the above changes
Use the rounded corner balloon (2nd option on the menu bar). If you need to use another style (which you should not), then just ensure it has the default style.
Figure: How to get a rounded corner balloon
Remember to keep the drop shadow effect by:
- Enable = True, and
- Opacity = 75
Note: You can check that by right clicking on the created object.
Figure: Check the 'Drop Shadow' is enabled
Changing Snagit's Balloons
Open Snagit and set it to be:
- Fill color: white darker 5%
- Outline color: red
- Outline width: 1px
- Font color: black
- Font family: arial
- Font size: 14px
- Effect shadow: default (light from top left)
- Effect Transparency: 10%
Using Snagit 10, you should get the setup above by making a single change from the red outlined default balloon: "Font color".
Figure: Pick the closest match default balloon so you make less changes to get the final result 
Figure: Setting up colors on Snagit 
Figure: Setting up outline on Snagit 
Figure: Setting up shadow on Snagit 
Figure: Setting up transparency on Snagit