Question about HP Scanjet 8250 Flatbed Scanner

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Bad contrast with scanner

No matter what options I select (and I have tried them all), every scan I do comes out with the same contrast/brightness, and it's not good. The white is OK, but the dark black writing on my original document comes out as merely RGB=(64,64,64). I've tried both TWAIN interfaces ("WIA-hp scanjet 8200 series" and "hp scanjet 8200 series TWAIN") to no avail.

Is there a setting inside the scanner, forcing it to produce scans with a particular contrast/brightness?

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Last things first: NO USER SERVICEABLE PARTS INSIDE.

That's the way HP does things. There are no rheostats or pots to adjust. It's all done electronically now, with chips and things.

You never said how it does with color or greyscale photos or drawings.

As for the RGB=(64,64,64), that's about right for the scan picture settings and the mixed (text and graphics) setting, and is particularly true for color picture settings. Have you tried using the setting for drawings (or line art), specifically greyscale drawings? Usually the greyscale lineart or drawing setting will render black text. You might also try scanning with the settings set for Text. If the greyscale drawing settings or greyscale text settings do not produce black text, try reinstalling your software and drivers.

If the contrast stays the same for all settings after reinstalling the software and drivers, and if it doesn't scan color and greyscale pictures correctly, then it sounds like your scanner is going bad.

As for the scans you've already done, you can darken the text by taking it into a photo editor, such as Paint Shop Pro or Photo Shop, and adjust the contrast and brightness to get the effect you desire.

Posted on Jun 09, 2009

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