int PS_open_image_file(PSDoc *psdoc, const char *type, const char *filename, const char *stringparam, int intparam)
This function reads image data from a file. It can read png, jpeg,
gif, tiff, and eps files. png, jpeg, gif, and tiff images can only
be read if pslib has been compiled with support for those formats.
Once an image has been loaded it can be placed on a page with
Since version 0.4.5 of pslib images are read by default for later
reuse. This means that the image is saved into a so called reusable
stream object. Later calls of PS_place_image(3) will only put a short
sequence of postscript code into the output file replaying the image.
This reduces the overall postscript file size, speeds up its processing by
the postscript rip and allows to place images into templates. This
behaviour can be turned off by setting the parameter imagereuse
to false with PS_set_parameter(3).