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Date Posted: 07:24:09 09/18/01 Tue
Author: Michel
Subject: Re: Using a percentage with TContrastTransform
In reply to: Marcel 's message, "Using a percentage with TContrastTransform" on 19:17:13 09/17/01 Mon

Hi Marcel,

You will need to change some code in TContrastTransform.Apply.

I assume 100 means increase greatly, and 0 means decrease greatly.

In the line,

Luminosity := Luminosity + (((((Sin(Theta)+1.0))*0.5)-Luminosity)*Sign)*0.5;

The final 0.5 before the semi-colon can be made variable to change the amount of increase or decrease. If it is 0, there will be no change; if it is higher than 0.5, the increase or decrease will be greater.

I have added this to my todo list. I may simply add a Factor property which will range from 1-10, where 1 is a small change and 10 is a large change.

Best regards,


>In Microsoft Word you can set the contrast setting for
>a graphic from 0 to 100% where 50% represents no
>change. How can you emulate this using a
>TContrastTransform image transformation in Delphi?

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