HTML is the preferred log type to access the screen snapshot.
Select HTML as the log type in the Logging Preferences Page in RFT Java™ or the Logging Options Page in RFT .Net.
After playback fails the log opens in your browser.
RootTestObject exposes a getScreenSnapshot method that will return a snapshot of the screen. GuiTestObject exposes the same method, but only captures the portion of the screen rendering the TestObject. LogInfo, LogError, and LogWarning all have overloads that will take a snapshot and add it to the log.