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Date Posted: 17:58:55 10/07/02 Mon
Author: Suri
Subject: Re: Problem Converting Image to B/W using TImageFormatTransform
In reply to: Suri 's message, "Problem Converting Image to B/W using TImageFormatTransform" on 19:18:46 10/04/02 Fri

Hi Suri,

Optimizing for palette video modes is not something I am planning since true color video mode is much more popular, and this would be a considerable amount of work.

Although, converting from True Color to BW should not be so much of a problem, but the dithering is one approach to reduce the number of colors. Have you tried it with Dithering = False? Quantize is not necessary because a black and white palette is always the same.

Best regards,


>I am having a problem converting True-color bitmap to
>a B/W using TImageFormatTransform while in 256-color
>video mode. (See Codes below). The actual image has
>the white background, but, the converted image will
>have a black-dithered background instead of white.
>I've tried with 32bit-color video mode and it will
>work fine. However, my client insists upon using
>256-color video mode. I would like to know why it
>happens and if there is a way to, maybe manually
>manipulate the color pallette through
>ImageFormatTransform object.
> lBmp := TBitmapGraphic.Create;
> lFmt := TImageFormatTransform.Create;
> //-- Assign from a True-Color TBitmap
> lBmp.Assign(mImgSrc);
> with lFmt do begin
> ImageFormat := ifBlackWhite;
> Quantize := True;
> Dither := True;
> Apply(lBmp);
> end;
> lFmt.Free;
>My system Info:
>OS: Windows 2000 SP3
>Processor: Pentium III 600 with 512mb RAM
>Video Card: ATI RADEON 7500

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