Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Image
CM_IMAGE_FILENAMEParameter: Film Aspect
CM_RDATA_FILMASPECTParameter: CM_RDATA_FILMPRESET
CM_RDATA_FILMPRESETParameter: Lens Profile
CM_LENS_PROFILE_FILENAMEParameter: Image Scale
CM_IMAGE_VIEW_SCALEParameter: Image Offset X
CM_IMAGE_VIEW_OFFSET_XParameter: Show Image
CM_IMAGE_SHOW_IMAGEParameter: Image Offset Y
CM_IMAGE_VIEW_OFFSET_YParameter: Keep in Foreground
CM_IMAGE_USE_FOREGROUND_DISPLAYParameter: Brightness
CM_IMAGE_BRIGHTNESSParameter: Full Image
CM_IMAGE_VIEW_FULLParameter: Match Width
CM_IMAGE_MATCH_VIEW_WIDTHParameter: Match Height
CM_IMAGE_MATCH_VIEW_HEIGHTParameter: Add Line
ADD_NEW_LINEParameter: Add Grid
ADD_NEW_GRIDParameter: Add Pin
ADD_NEW_PINParameter: Delete Line
DELETE_LINEParameter: Delete Grid
DELETE_GRIDParameter: Delete Pin
DELETE_PINParameter: CM_LINE_HAS_MEASUREMENT
CM_LINE_HAS_MEASUREMENTParameter: CM_LINE_WORLD_LENGTH
CM_LINE_WORLD_LENGTHParameter: CM_GRID_HAS_MEASUREMENT_A
CM_GRID_HAS_MEASUREMENT_AParameter: CM_GRID_WORLD_LENGTH_A
CM_GRID_WORLD_LENGTH_AParameter: CM_GRID_HAS_MEASUREMENT_B
CM_GRID_HAS_MEASUREMENT_BParameter: CM_GRID_WORLD_LENGTH_B
CM_GRID_WORLD_LENGTH_BParameter: CM_GRID_HAS_ASPECT
CM_GRID_HAS_ASPECTParameter: CM_GRID_WORLD_ASPECT_A_OVER_B_USER
CM_GRID_WORLD_ASPECT_A_OVER_B_USERParameter: CM_NUM_GRID_SEGMENTS_0
CM_NUM_GRID_SEGMENTS_0Parameter: CM_GRID_OFFSET_0
CM_GRID_OFFSET_0Parameter: CM_NUM_GRID_SEGMENTS_1
CM_NUM_GRID_SEGMENTS_1Parameter: CM_GRID_OFFSET_1
CM_GRID_OFFSET_1Parameter: CM_PIN_COORDS
CM_PIN_COORDSParameter: Create Camera Mapping Tag
CREATE_CAMERA_MAPPING_TEXTURE_TAGParameter: Create Background Object
CREATE_BACKGROUND_OBJECTParameter: Calculate PP for 3VPs
CM_CALC_PP_WHEN_3VPSParameter: Offset Magnifier
CM_LOUPE_USE_OFFSETParameter: Magnifier Zoom Value
CM_LOUPE_MAGNIFICATIONParameter: Magnifier Size
CM_LOUPE_SIZE_PIXParameter: LINKED_ELEMENT_LIST
LINKED_ELEMENT_LIST