A thousand apologies for the late response to your question. As a matter of fact, I think by now you must’ve already resolved this on your own. Nonetheless I’ll give you my 2cents C: Okie Dokes. To answer your question, well to be honest, I’m no technician nor do I know that much about printers/scanners/all in one’s but I will still help as best as I can based on what I know.
Judging from what you told me, I don’t think it’s your sketchbook…unless your sketchbook is one of those ones with the black coloured paper. If it’s anything it’s the scanner/printer.
When you scan, do you scan with the scanner cover up or down? If you’re scanning with the lid up, then maybe it’s the intensity of the room or space that you’re scanning in. If you’re scanning with the tip down and you still get that problem.
Here’s a tip: Every scanner (even the all in one kind) comes with software to install and I believe there is part in the software where you can adjust the brightness or intensity of the image after it’s scanned on the computer. So if your scan comes out too dark, try adjusting it in the scanner program.And if that fails, there are graphic programs like Photoshop or Paint Tool Sai with features that can help you to adjust your scanned sketch so that it’s looking just right C:
Since you’re asking in my Preparing Scanned Sketches tutorial, I’ll let y’know that when I scanned my sketches, they came out a bit light or dark from time to time to. That’s why I bring them into Sai and adjust them with Brightness and Contrast so that they are good enough for me to see when it’s time for me to draw C:
If you still continue to have issues, then try goggling “How to adjust brightness of scans” for your model of scanner. There might be a few sites or forums with answers from people who probably had the same problem as you so that could help as well C:I hope this answers your question and I hope it helps. If you need any more assistance, feel free to ask and I’ll try my best to answer quicker next time, I promise >D