Re: White areas not exactly white

Hello,

Sometimes we scan documents as blank-and-white documents, and sometimes as color documents.  Black-and-white works just fine, but when we scan documents in color, the white areas of the document don't quite appear white.  They have a rather uneven blueish/grayish hue.

Is there any way to fix this?  Perhaps a way of processing the image afer it has been received from the scanner to make near-white areas completely white?

Ken

Ken,

One way to correct it if the color shift is uniform is to manipulate
the color properties of the image (hue, saturation, etc.) to counter the effect you're getting.


Another way to solve it if your problem is only in the white parts is
to convert these areas to pure white. To do that, you could define a
region based on a color range that contains all these 'whitish' shades. After that, fill this region with white (RGB 255, 255, 255).

The exact details depend on your LEADTOOLS version and programming interface (OCX, DLL API, C++ Classes, etc.)

Amin Dodin

LEADTOOLS Technical Support