POV-Ray : Documentation : Output file formats
  POV-Ray 3.6 Documentation Online View SVGAlib display   5.3.4 Interrupting POV-Ray Output file formats

The default output file format of POV-Ray for Unix is PNG (+fn). This can be changed at runtime by setting the Output_File_Type or +fx option. Eventually, the default format can be changed at compile time by setting DEFAULT_FILE_FORMAT in the config.h file located in the unix/ directory.

Other convenient formats on Unix systems might be PPM (+fp) and TGA (+ft). For more information about output file formats see File Output Options.

If you are generating histogram files (See CPU Utilization Histogram) in the CSV format (comma separated values), then the units of time are in tens of microseconds (10 x 10-6 s), and each grid block can store times up to 12 hours. SVGAlib display   5.3.4 Interrupting POV-Ray

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