Hartmut Henkel wrote:
seems so yes: the alpha channel, if it would be properly extracted. Or use a separate image, tried just the maybe most trivial case:
\pdfcompresslevel=0 \nopagenumbers \immediate\pdfximage {mask.jpg} \pdfximage attr {/SMask \number\pdflastximage\space 0 R} {img.jpg} \leavevmode \rlap{Hello}% \rlap{\hbox{\pdfrefximage\pdflastximage}}\bye
The Hello shines through. Drawback: Seems that xpdf doesn't have any idea of /SMask yet, the example works only with acroread and gs.
Interesting, but it seems that the images must be kind of specisl, since it does not work on arbitrary ones Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------