Comment by 1001101
8 years ago
Which shade of yellow? Assuming it's a uniform yellow (which I doubt in an analog to digital conversion), miss it by one bit, and your source is burned.
8 years ago
Which shade of yellow? Assuming it's a uniform yellow (which I doubt in an analog to digital conversion), miss it by one bit, and your source is burned.
Well... You scan your printed page in and scan the dots and see what colour they are, then you change the background to that colour...
Sure. Quick thought experiment: you've got a 24-bit scanner, which means 2^24 individual values, so 16.8 million. Let's say 2 million of those are yellow. How many different shades of yellow are you going to get from your scan? Do you take the average? Does the process leave artifacts - that is, does it print yellow over yellow and leave a physical trace? My point is you've got to make sure the signal is well below the noise floor because we're talking about the NSA, and there are more sure ways to filter this signal.
Scan using the printer/scanner you use to print the final copy with