I had this maybe-brilliant idea to consolidate all my cards with barcodes (Safeway, 24-hour Fitness, Petaluma Library, etc) by making the barcodes display on my iPod Touch. I got the barcode program working, but went to the gym today and the guy tried to scan it... no luck. Double-checked the barcode itself against the one on my membership card, it seems to be correct. So the problem is more likely that the laser scanner does not see the black-and-white on the iTouch screen the same way my eye does.
So... the question is: is there a way to make this work, say by using red/green instead of black/white? Or is the whole idea unfeasible due to the characteristics of the hardware and optics, of which I know next to nothing?
Thanks in advance for any clues! -- jc