Map Service Image Format
    
  Types
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                  BMP.
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                  To use service-defined default image format.
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                  GIF.
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                  JPEG. Supported in both the ArcGIS image and map services.
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                  JPG | PNG. Supported in ArcGIS image service only. This format returns a JPG if there are no transparent pixels in the requested extent, otherwise it returns a PNG.
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                  PNG. Supported in ArcGIS map service only.
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                  24bit PNG. Supported in both the ArcGIS image and map services.
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                  PNG32. Supported in both the ArcGIS image and map services.
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                  8-bit PNG. Supported in both the ArcGIS image and map services.
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                  TIFF.
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                  Unknown.