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Date Posted: 20:21:36 11/06/00 Mon
Author: Michel
Subject: Re: Inverted B/W Scanning Tiffs
In reply to: Randy Threewits 's message, "Inverted B/W Scanning Tiffs" on 09:55:20 11/06/00 Mon

Hi Randy,

I have not found a solution to this. I have also tested with different scanners, and some seem to use a different convention as to what is black and what is white. The interface of some drivers though, allow inverting the black and white as required.

I may not be difficult either to look at some sample pixels on an image an determine which is white and black. (usually the majority is white). Then the TNegativeTransform could be use to invert the image.

Best regards,


> First off, I'm very impressed with your Envision
> library it's doing a great job at a great price.
> When Scanning From a client's Visioneer Paperport I
> get Inverted images. When runing on my development
> System (UMAX 2100U) ALl is Fine. Any suggestions?
> (I don't think this an Envision problem as I think
> I've had this occur while evaluating some other Image
> tools.)
> If there is an easy way to tell if an image is scanned
> inverted, I can just invert it myself.
> Envision Version: 1.04
> Delphi 5
> Saving as CITT Group 4 facsimile encoding
> Client System
> - Visoneer Paperport (I'm not sure the specific model
> but think itm might be a 'Pro', I can find out and
> inform you if needed)
> - Windows 98
> - Result is White on Black
> Development System
> - UMAX 2100U
> - Windows 2000 Server
> - Result is Black on White
> Many Thanks

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