A lot of the time hand drawn/rendered work needs to be scanned in for computer editing or so it can be replicated (So you don't give away the original). However different scanners, copiers and printers recognise and print colours differently. This is why it is handy to have a record of the results of the machines you have access to.
Now I don't have a printer so I have used the library printers. I created two sheets of coloured swatches one on paper and one on trace. I then scanned the pictures in and got this result:
Paper scan Trace scan
Now the paper scanned pretty well and the colours matched almost perfectly however when printed from the scan the colours were less vibrant and a little washed out. Some of the lighter ones actually became quite pixelated as well. The straight copy came out better and wasn't pixelated. However I noticed that the brighter colours came out darker and the lighter colours came out, well, lighter.
The trace was pretty similar results wise. The straight copy produced better colours most similar to the original while the scan and copy produced pixleated swatches. Both of these prints gave out lighter and more washed out colors though.
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