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Date Posted: 07:14:29 05/16/00 Tue
Author: Michel
Subject: Re: Bitmap, SaveToFile and ImageFormat
In reply to: Peter 's message, "Bitmap, SaveToFile and ImageFormat" on 08:41:10 05/15/00 Mon


Dear Peter,

You are correct about this. As far as I know, with BMP's gray 256 and color 256 are really the same, except for a gray images the red/blue/green palette entries have the same value. To determine if an image is gray or color, I would recommend iterating of the colors of the Palette property, and check if the red/blue/green values are the same for every entry.

Best regards,

Michel

> If I save a TBitmap with ImageFormat ifGray256 as File
> and
> reopen it, than the ImageFormat is a ifColor256.
>
> if ImageScrollBox.Graphic.ImageFormat = ifGray256 then
> showmessage('Yes its gray');
> ImageScrollBox.SaveToFile(BMPFile);
> ImageScrollBox.LoadFromFile(BMPFile,0);
> if ImageScrollBox.Graphic.ImageFormat = ifColor256
> then showmessage('Why is it Color?');
>
> Peter

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