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Date Posted: 17:40:39 12/02/02 Mon
Author: Michel
Subject: Re: Missing functions RGB and contrast
In reply to: Wolfgang Mattis 's message, "Missing functions RGB and contrast" on 11:25:23 12/01/02 Sun

Hi Wolfgang,

To change the RGB channels separately, you will need to manipulate the pixels individual. See the TDibGraphic.RGB property. You can change the overall intensity of an image using the TBrightness transform for TGammaTransform.

For the contrast there is the TContrastTransform.

You will need to create the user interface to use the transforms.

Best regards,

>I'm just evaluating the Envision graphic library... Is
>it correct that there are no functions to change the
>intensity of the colors? I mean the follwing: In a
>program I want to use 3 sliders to set the intensity
>of the colors red, green and blue of an image. Also I
>miss a function to set the contrast: I mean not the
>"sharpen" function, but a function like the contrast
>knob of a TV set. Any idea how to realize that? Or are
>add on packages for that library available?

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