I recently had a discussion with a colleague about the quality of a scanned image.
We wanted to scan an original page with a signature on it (among other things). The objective was to get the best possible quality. It was on slightly colored paper.
The colleague suggested “scanning it onto brighter white paper.”
“What do you mean?” I asked.
“Just scan it onto plain white paper.”
“What are you trying to achieve?” I asked.
“See how it’s on slightly colored paper? That will make the scan slightly colored. Scan it onto plain white paper,” she tried to clarify.
“Uh, I can’t ‘scan it onto paper.’ I guess I could scan it and then print it out onto white paper, but what would the purpose of that be? The slight color it now has would also print onto the white paper anyway.”
“You could scan that copy,” she suggested.
“But…scanning it twice won’t improve the quality of the image – it will degrade it.”
“Well, print a new one from the MS Word file onto white paper and scan that,” she countered.
“That won’t have the signature on it AND if it’s bright white, it won’t match the other pages unless we rescan the whole thing from new white pages.”
“Then do that,” she said, with a smile, showing how simple it was.
“But then we won’t have the signature,” I pointed out.
Eventually she went away and I scanned the existing, off-white page, stuck it into the .pdf, and no one could tell the difference.