Have 2 bitmap resolutions in a PDF

Question

Is there a way to place 2 instances of a bitmap in a PDF for a single image? One to display when it is viewed on the screen and another when it prints?

The problem we have is rendering a chart to a bitmap. If we do 300 dpi then axis lines, borders, etc. disappear. If we do 96 dpi, then printing it looks bad.

thanks - dave

Answer 1

You can use Optional Content to do this. Supplying the usage application dictionaries with a 'Print' event causes the content to be appropriate for printing. (Note, not all printing applications will honour this).

See The PDF Reference Manual, in my 1.7 edition section 4.10 'Optional Content' beginning on page 364.

Answer 2

You can add an Alternate Image Dictionary (PDF Spec, section 8.9.5.4) which can specify an image to be used for printing.