I need help - I can help - transparent jpeg images

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transparent jpeg images

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1270
Printed Date: 24 May 24 at 7:58PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: transparent jpeg images

Posted By: divo
Subject: transparent jpeg images
Date Posted: 11 Nov 09 at 3:56PM

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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