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Date Posted: 03:54:51 01/29/01 Mon
Author: Martin
Subject: Re: Wrong color mapping with 256 colors
In reply to: Michel 's message, "Re: Wrong color mapping with 256 colors" on 07:21:05 01/26/01 Fri

Michel,

as a workaround I load the image with TImage and display it with TImageScrollBox. The color mapping is done by TImage.

It's strange, but this does work only if performance is set to jpBestSpeed. The color mapping in TImage is better with jpBestQuality, but when I move the pixel to TImageScrollBox the color mapping is lost.
Nevertheless the picture looks better than before.

image.Picture.LoadFromFile(picturePath);
with TJPEGImage(image.Picture.Graphic) do
begin
PixelFormat := TJPEGPixelFormat(jf8Bit);
Scale := TJPEGScale(jsFullSize);
Performance := TJPEGPerformance(jpBestSpeed);
end;
imageScrollBox.Graphic.Assign(image.picture.graphic);




>Hi Martin,
>
>Dealing with video modes that use a palette is
>generally quite difficult. Considering that 256 color
>video mode is becoming less and less common, I prefer
>working on other enhancements. 256 color video mode
>also brings other problems, such as two applications
>displaying images at the same time. You will notice
>there will always be one application that has the
>wrong palette, if both applications are visible on
>screen.
>
>Best regards,
>
>Michel
>

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