When copying, darkness level can easily be modified using buttons present on printer, it can either be set to light or dark or normal. But what about printing? How to print light?

If a document is copied and then the same document is scanned and then printed, there is a lot of difference between copied document and printed document.

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    It depends on the printer model as to the dialog, but when printing from something like Word you'd go to the 'Printer Properties' and adjust your settings from there. – spikey_richie Oct 3 '18 at 12:32
  • @spikey_richie What about the general images - scanned images or snapshots from phone camera? – Chinmay Sarupria Oct 3 '18 at 12:34
  • Again, the printer driver on your device should have an extended printer properties dialog where you can adjust the settings such as paper size, duplex, paper source etc... – spikey_richie Oct 3 '18 at 12:37
  • @spikey_richie Yes all those options are available but I have never been able to find lightness/darkness levels in printer settings, I've tried multiple printers. – Chinmay Sarupria Oct 3 '18 at 12:46

The ability to set lightness and darkness levels depends on the printer. For example, my Canon printer has this setting for manual color adjustment :


Other printers may have other adjustments or none.

As regarding the differences between colors after scan, this is caused by difference of equipment and by the fact that the number of colors for the computer is limited.

Colors are usually represented by 24-bit pixels, where each of the components of Red, Green and Blue takes 8 bits. This gives only 256 shades for each component, which is less than what a trained eye can do.

Some printers support 48-bit scanning, which also produces a special kind of image. With 48-bit printing the number of 256 jumps to 65536 and is much more precise. The following examples come from the article What's The Difference Between Scanning 24 Bit vs. 48 Bit? and are zoomed-in to show the difference :

24 bits

48 bits

So what happens is that the scanner gets the colors just a little bit wrong, because it needs to assign each color one component out of only 256, then the printer needs to convert this color to a combination, for an ink-jet printer, of sprinkled ink dots over the paper.

You may add here the quality of the paper, where the printer assumes that it is pure white, while it's close to real white only for the highest-quality paper, more used for printing photos than documents.

The whole process is extremely imprecise and the results may be off by a bit even for high-end printers.

You might also be interested in the article Why don't my monitor colors match the printed colors?.

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