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ImageTypeEnum enumeration constants are used to convert coordinates between different image planes and modification states of the ImageDocument object, which represents an open image. The open image contains one image plane for each color type (black-and-white, gray, or color), and can also contain a preview image plane. The image can be subjected to modifications during opening and preprocessing, and the constants of this enumeration refer to original image without any modifications and to the image with all the modifications up to the moment when the CoordinatesConverter object was saved. 
typedef enum {
 IT_Base,
 IT_Modified,
 IT_Preview
} ImageTypeEnum;

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Elements

NameDescription
IT\_BaseThe original image.
IT\_ModifiedA modified image. This image plane corresponds to the modification state of the image at the moment when the CoordinatesConverter object was saved.
IT\_PreviewPreview image. <Note> This image plane is created on a call to the PreviewImage or PreviewImageDefaultSize property of the ImageDocument object. If the preview image plane hasn’t been created yet, an error will occur if you try to use it for coordinates conversion. </Note>

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Used in

ICoordinatesConverter::ConvertCoordinates