Printing, copying protection

[Methanol]

Hi all

Anyone know of any ink and paper combinations one could use, to eliminate people from making subsequent copies of a print? I was thinking Semigloss/Pearl paper.

What would be nice is, if one could somehow incorporate the technology they use when printing magazines, how when you try to scan it, it shows them kind of circles.

Any thought people?

Thx in advance.

[_dobbo_]

Methanol said:

Hi all Anyone know of any ink and paper combinations one could use, to eliminate people from making subsequent copies of a print? I was thinking Semigloss/Pearl paper. What would be nice is, if one could somehow incorporate the technology they use when printing magazines, how when you try to scan it, it shows them kind of circles. Any thought people? Thx in advance.

I think the thing with magazines is that the printing isn't that good quality - which is why you see the circles.

However most scanners have a "reduce moire" option which gets around this completely.

[te51cle]

Been meaning to ask, what do people like the DVLA and tge Passport office do so that when you photocopy their documents it shows up clearly that you've made a copy ?

[simpo two]

Methanol said:

What would be nice is, if one could somehow incorporate the technology they use when printing magazines, how when you try to scan it, it shows them kind of circles.

That's just moire from the printing dots. Scan at higher res and they will resolve into dots.

te51cle said:

Been meaning to ask, what do people like the DVLA and tge Passport office do so that when you photocopy their documents it shows up clearly that you've made a copy ?

That may be something to do with green and blue, colours which don't always photocopy well. Reminds me of when I (for amusement only of course) tried to scan a banknote into PhotoShop. It said 'Scanning banknotes is illegal'. Clever programme! Had to do it 4 chunks and stitch them instead!

[pmanson]

simpo two said:

That may be something to do with green and blue, colours which don't always photocopy well. Reminds me of when I (for amusement only of course) tried to scan a banknote into PhotoShop. It said 'Scanning banknotes is illegal'. Clever programme! Had to do it 4 chunks and stitch them instead!

Our photocopier at work was like that.

It wasn't too clever though I was still able to copy 50p pieces

[-DeaDLocK-]

pmanson said:

It wasn't too clever though I was still able to copy 50p pieces