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Date Posted: 17:42:43 03/25/02 Mon
Author: Michel
Subject: Re: Smaller image - Bigger File size!!!!
In reply to: Marko 's message, "Smaller image - Bigger File size!!!!" on 11:39:13 03/25/02 Mon



Hi Marko,

The original software probably used a lower quality factor. Sometimes a jpeg quality factor of 40 can give a reasonably good looking image.

Expirement with the SaveQuality until you get the best quality/size compromise.

Best regards,

Michel

>Hi all.
>
>I'm trying to resize an image and save it to a .jgp
>file.
>To accomplish that I'm using a TResizeTransform and a
>TJpegGraphic, then saving to a TFileStream. The
>original image is a 640x480 jpeg, 41KB file from a
>digital cam.
>
>The resulting file has 170KB!!!
>
>Please send me the correct algoritm if you see
>something wrong.
>
>Thanks.
>
>P.S.: This is the code I'm using.
>// transform to resize
>
> Transform.Interpolated := True;
> Transform.Filter := ifMitchell;
> Transform.OverrideDestFormat := True;
> Transform.DestFormat := ifTrueColor;
>
> Transform.Width := 400;
> Transform.Height := 300;
>
> Transform.ApplyOnDest(ImageScrollBox.Graphic,
>ImageScrollBoxGuardar.Graphic);
>
>// save to jpeg
>
> Jpeg := TJpegGraphic.Create;
> Jpeg.Assign(ImageScrollBoxGuardar.Graphic);
> JPeg.XDotsPerInch := 72;
> Jpeg.SaveQuality := 85;
> Jpeg.SaveProgressive := false;
> Jpeg.OptimizedHuffmanCodes := true;
> Jpeg.SaveToStream(archivo);
> Archivo.Free;
> Jpeg.Free;

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