If we want parity, we need real tactile displays. Most sighted people I know don't own printers either. They certainly don't print out a new hard-copy graphic each time they zoom or pan each image that they view. We will have a better chance of keeping up when the Graphiti tactile display eventually decreases in price, and is more widespread. Sent from my iPhone > On Mar 31, 2022, at 12:23 PM, Linux for blind general discussion <blinux-list@xxxxxxxxxx> wrote: > > [ Sorry; hit send before I was really ready. -r ] > > Here's Wikipedia's take on swell paper, buried in a page on tactile graphics: > >> Swell paper has a special coating of heat-reactive chemicals. Microcapsules > of alcohol implanted in the paper fracture when exposed to heat and make the > surface of the paper inflate. Placing black ink on the paper prior to a heat > process provides control over the raised surface areas. ... > > -- https://en.wikipedia.org/wiki/Tactile_graphic > >> ... how do you transfer images from the normal paper to the swell paper > > I used a multifunction device (fax, printer, scanner) as a copying machine. > The reason I did this is that the ink in my normal printer smeared on the > rather slick surface of the swell paper. I guess the ink in the copier comes > out a bit dryer... > > FYI, any device used to process swell paper needs to have a reasonably > straight paper path, to reduce the risk of jamming, damaging the paper, etc. > Also, the ink needs to heat up significantly when exposed to the bright > light in the expansion unit. Carbon-based inks seem to work well for this. > > - Rich Morin > > _______________________________________________ > Blinux-list mailing list > Blinux-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/blinux-list > _______________________________________________ Blinux-list mailing list Blinux-list@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/blinux-list