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Date Posted: 21:32:22 09/04/02 Wed
Author: Michel
Subject: Re: Tiff image saved looks like a negative - Last one :)
In reply to: David Barnes 's message, "Re: Tiff image saved looks like a negative - Last one :)" on 17:12:03 09/04/02 Wed

Hi David,

Yes, this gets confusing and I don't thing there is easy solution. I think some people don't agree if 1 if white or black. I think doing any changes in the Envision source code would cause more problems then it would solve. I have seen some twain drivers, that give this option to invert or not. It would then be upto to user to check the option as appropriate.

The negative tranform can be used for this, but you are right, you don't know when you should use it in advance. I guess the most fancy way to do this would be to sample some of the pixels of the images (especially near the margins) and make an educated guess from that.

Best regards,


>Ok, well, I found the TNegativeTransform Class and
>just used that to make my corrections. This works
>great for this scanner. But, how will I know if I need
>to apply it or not?
>I guess I could make a checkbox option for a user to
>set if they need to make the correction... ? :)
>Thanks again,
>David Barnes

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