...scan an image directly into the application?

The setup program for Imaging (tool that ships with Windows > 98) installs the Image
Scan control (OCX) and the 32-bit TWAIN DLLs.
All you have to do is to import this ActiveX control in Delphi and generate
a component wrapper:

Import the ActiveX Control "Kodak Image Scan Control"
(Select Component|Import ActiveX Control...)

Now add a TImgScan Component from the Register "ActiveX" to your form.

Change the following Properties in the Object Inspector:

FileType = 3 - BMP_Bitmap
PageOption = 4 - OverwritePages
ScanTo = 2 - FileOnly


{***}

Das Setup Programm für Imaging (Ist bei Windows > 98 dabei)
installiert das Bild Scanning Control (OCX) und die 32-bit TWAIN DLLs.

Importiere das ActiveX-Control "Steuerung für Kodak-Bildscan".
(Im Menü Komponente, "ActiveX importieren" anklicken.)

Dann "Steuerung für Kodak-Bildscan..." auswählen und den
"Installieren..." Button anklicken.

Füge nun eine "TImgScan" Komponente aus dem Register "ActiveX" auf dem
Formular ein.

Ändere im Objektinspektor unter "ImgScan1" folgende Eigenschaften:

FileType = 3 - BMP_Bitmap
PageOption = 4 - OverwritePages
ScanTo = 2 - FileOnly


{***}

procedure TForm1.Button1Click(Sender: TObject);
begin
  if imgScan1.ScannerAvailable then
    try
      imgScan1.Image := 'c:\Scanner.bmp';
      imgScan1.OpenScanner;
      imgScan1.Zoom := 100;
      imgScan1.StartScan;
      Application.ProcessMessages;
    finally
      imgScan1.CloseScanner;
      { Show the scanned image in Image1 }
      imgScan1.Picture.LoadFromFile(Image1.Image);
    end;
end;