How to use the alpha option in layer grading?

Which is the reason for the alpha option? I ask because none of the shoot for any camera has alpha. The only images with alpha are CGI generated, as far as I am aware. Then, the alpha option is only for grade CGI images?

Yes, it's possible, but it hasn't sense: the keyed objects are composed in a compositor as After or Nuke, and once already well integrated with the background, the resulting images are ready for grading.

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    MMAPS = c_x
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    FTREL = c_x
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    conversion_error = 8
    others = 9.
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    FBSTP = c_x
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    into w_msg.
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      PERFORM BUILD_FIELDCAT USING 'OJTXP' 'Description'.
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      PERFORM BUILD_FIELDCAT USING 'MEINS' 'Unit Of MEASUREMENT'.
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      WA_FIELDCAT_LN-REF_TABNAME  = 'IT_COMP'.
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    parameters: p_werks like t001w-werks obligatory.
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    no_suitable_bom_found = 7
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    others = 9.
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