transparent jpeg images

Hi there,

I have a problem with grayscale jpeg images. If I add a grayscale jpeg and set an image mask for transparency no error is thrown, but if your view the pdf via Acroread 9.2 it informs you about an error on the page.

Below is a small program that reproduces the behaviour. (I'm using Delphi2009) At the end of this post is a base64 encoded 1x1-px jpeg that one can use.

Is this a bug in the library or am I doing something wrong here?


program error;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  QuickPDF0717;

var
  QP: TQuickPDF0717;
  retval: Integer;

begin
  try
    QP:= TQuickPDF0717.Create;
    if QP.UnlockKey(YOUR KEY HERE) = 0 then raise Exception.Create('UnlockKey');
    if QP.NewDocument = 0 then raise Exception.Create('NewDocument');
    if QP.AddImageFromFile('error.jpg', 0) = 0 then raise Exception.Create('AddImageFromFile');
    if QP.SetImageMask(0.9, 0.9, 0.9, 1, 1, 1) = 0 then raise Exception.Create('SetImageMask');
    if QP.DrawScaledImage(0, QP.ImageHeight, 0.5) = 0 then raise Exception.Create('DrawImage');
    if QP.SaveToFile('dummy.pdf') = 0 then raise Exception.Create('SaveToFile');

  except
    on E:Exception do begin
      Writeln(E.Classname, ': ', E.Message);
      Readln;
    end;
  end;
end.


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ERETFhwXExQaFRERGCEYGh0dHx8fExciJCIeJBweHx7/wAALCAABAAEBAREA/8QAFAABAAAAAAAA
AAAAAAAAAAAACP/EABQQAQAAAAAAAAAAAAAAAAAAAAD/2gAIAQEAAD8AZb//2Q==