How can I get the width and the heigh of my jpg file?

Open the .jpg file in Microsoft Photo Editor and right click on it and go to properties.  It will tell you the size.

No, I need to get the size through my program so that I can resize my window to the size of the my jpg.

Let me explain better

I have a jpg that I will be loaded into my form, in the component image.

But this jpg can diversify its size, that will only depend the way I record my jpg.
My form is 600 * 800 but if my jpg file is 500 * 500, then I need resize my form.

Did you get it?

If I understand you need to lock the .jpg file into a size and position on the form.  

What software are you using to create the form.

thanks

Perhaps this is an even more simple approach

procedure TForm3.FormShow(Sender: TObject);
begin
     // After loading the image. 
     Image1.Align :=alNone;
     ClientHeight := Image1.Height;
     ClientWidth := Image1.Width;
     Image1.Align :=alClient;
end;

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