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Date Posted: 07:37:00 05/03/00 Wed
Author: Michel
Subject: Re: background image on TIF file pages
In reply to: Davide Garzetti 's message, "background image on TIF file pages" on 05:11:38 05/02/00 Tue


Dear Davide,

The first thing you need to do is to create a new tiff file with the overlayed images, as you can only append images to a tiff file.

For the overlaying part, you'll need to interate over every pixel in the source and destination image. This is assuming all images are the same dimensions.

You can use the RGB property of the TDibGraphic class to access each pixel individually. You need to combine the pixel of both images to obtain the overlayed imaged. I guess you may combine them in different ways, ie, averaging their Red,Green, and Blue values to create the overlayed images. In the EnTrans.Pas unit, you'll find examples on how to use the RGB property. The TConvertToGrayTransform is an easy example to understand.

Best regards,

Michel


> What is the shortest way to overlay a single page TIF
> image on each page of a second TIF file?
> Thanks.

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