pdf_open_image_file Reads an image from a file intpdf_open_image_file intPDF-document stringimagetype stringfilename stringstringparam stringintparam Open an image file. Supported types are "jpeg", "tiff", "gif", and "png". stringparam is either "", "mask", "masked", or "page". intparamis either 0, the image id of the applied mask, or the page.