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Date Posted: 07:49:14 01/29/01 Mon
Author: Michel
Subject: Re: Wrong color mapping with 256 colors
In reply to: Martin 's message, "Re: Wrong color mapping with 256 colors" on 03:54:51 01/29/01 Mon

Hi Martin,

Thanks for letting me know about this workaround. Indeed, the TImageScrollBox will load any TGraphic descendant it does not recognize. In that case it just copies the canvas from on graphic to another.

Best regards,


>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;
>>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
>>Best regards,

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