JPEG interfaces

Good day.

I want to store some my work as JPG files....

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outstring="Test.jpg"
render camera:$RenderCamera01 vfb: false outputSize: [400,300] \ outputfile:outstring
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How I can adjust "JPEG interfaces" for Test.jpg file?
Where I must pust "JPEG interfaces" for Test.jpg file, before or after "RENDER" command?