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Date Posted: 06:18:26 11/01/01 Thu
Author: Michel
Subject: Re: Increasing the size of a JPEG
In reply to: Gregg Van Oss 's message, "Increasing the size of a JPEG" on 17:30:19 10/31/01 Wed


Hi Gregg,

You need to create a new image, and copy the smaller one into it.

For example,

NewGraphic := TDibGraphic.Create;
NewGraphic.NewImage( ... )
NewGraphic.Canvas.Draw( X, Y, SmallerGraphic );
ImageScrollBox.Graphic := NewGraphic;
ImageScrollBox.Redraw(True);
NewGraphic.Free;

Best regards,

Michel



>I’m working with JPEG images and I need to change the
>size if it’s below a certain minimum. For example, if
>the user loads a 300x300 image, I want to add a
>boarder on the right and bottom to make the image
>800x600. Not by stretching the image, but just adding
>a blank boarder. Cropping is easy with the transform,
>but this is proving to be trickier than I’d expected.
>If I change the width of the graphic, I get an
>exception that says I must use the NewImage method.
>But by calling ImageScrollBox.Graphic.NewImage, I get
>an entirely new blank image, rather than just changing
>the dimensions of the existing image. What should I be
>doing here?

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