使用itext库在pdf文档中添加内联图像

Question

我们已经创建了一个使用itext 5库生成pdf文档的应用程序。作为pdf生成的一部分，我们试图将图像内嵌在pdf中，该图像应不可编辑且只读。我们尝试使用PdfContentByte的addImage方法，如下所示，

byte[] decoded = Base64.getDecoder().decode(encodedImage);
image = Image.getInstance(decoded);

检索此图像后，在addImage方法中使用了相同的图像。

PdfContentByte canvas =  pdfStamper.getOverContent(item.getPage(0));
canvas.addImage(image, Boolean.TRUE);

Findings：由于图像为Base 64字符串格式，因此图像不会显示在生成的pdf文档中（如果图像不是Base 64格式，则可以正常工作。）]]

当我们打开pdf时，显示以下错误：------->“此页面上存在错误。Acrobat可能无法正确显示该页面。请与创建PDF文档的人联系以更正此错误。问题。“

我们如何处理这种情况？。

是实现此要求的任何其他方法。请帮助

代码：-

PdfReader resultantPdfReader = new PdfReader("template.pdf");

PdfStamper resultandPdfStamper = new PdfStamper(resultantPdfReader, new FileOutputStream("A13.pdf"));

AcroFields acroFields = resultantPdfReader.getAcroFields();
Rectangle fieldPosRec = acroFields.getFieldPositions("imageField").get(0).position;

String encodedSignature = ""; 
encodedSignature = new String(Files.readAllBytes(Paths.get("MyImage.png")));

if(encodedSignature.indexOf("data:image/png;base64,") != -1) {
    encodedSignature = encodedSignature.substring("data:image/png;base64,".length());
}

Image image = null;
try {
    byte[] decoded = Base64.getDecoder().decode(encodedSignature);
    image = Image.getInstance(decoded);
} catch (Exception e) {
    e.printStackTrace();
}
image.scaleAbsoluteHeight(fieldPosRec.getHeight());
image.scaleAbsoluteWidth(fieldPosRec.getWidth());
image.scaleToFit(fieldPosRec);
acroFields.removeField("imageField");                                              
image.setAbsolutePosition(fieldPosRec.getLeft(), fieldPosRec.getBottom());
PdfContentByte canvas = resultandPdfStamper.getOverContent(item.getPage(0));
canvas.addImage(image, Boolean.TRUE);
resultandPdfStamper.close();
resultantPdfReader.close();
Base64的图像串：iVBORw0KGgoAAAANSUhEUgAAAU4AAACWCAYAAACxSWGfAAAAAXNSR0IArs4c6QAAFJFJREFUeAHtnQmwZFV9hw37DgoiaJgZsGBAFgkSIEJgjAZRAliFikrEoOgoGkQlEFJKiXFhr5RCAKMjJhBETAoRImjAB4KAKBgEDBBhQM2IyEDYh2XM90Gf8k7T3a / fe9093X1 // 6rv3XOXvsvX9 / 773HNP93vBCxIxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAMxEAPNBl7MhEObJ2Y8BmIgBmKgtYG9mTwBv2vAIBEDMRADMdDKwCuYeCmUhFmGrZbNtBiIgRhoa2AN5uwDZ8L3oCST6Q6vYR3nwnyYC8MQ67MTp8JT4HEthsMbZccTMRADMTCpgU1Z4kPwbXgCppsku3ndIta / vBLpymz7w2CidF9NnCZQE6lR9v + 5sfyNgRiIgYqBlSjvASfALVAShsNn4Br4OPwRzDSsZc4Hk + UiqG7LstOcNx / mQj9iM1Z6LFwNZfveonurXmJVCmVemZZhDMRAzQ1swPG / E74GD0BJEg4dPw8OAp8u9zNMjibJc2ERVPfDstOcNx / mwnRjLV54MFwBS6Fsx3X7MKg5jmeCyxzXPCPjnQ38QefZmRsDI2dge / bYJCE7wwpQ4mcULm5wFcOny4wBD02O8yps1LR9b6sfhvsa / GaS8k7M / 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我们已经创建了一个使用itext 5库生成pdf文档的应用程序。作为pdf生成的一部分，我们试图将图像内嵌在pdf中，该图像应不可编辑且只读。我们...

Answer 1

您的示例图像具有iText无法正确转换为嵌入式图像的属性。不幸的是，它无法识别并输出错误的结果PDF。

特别是您的图像文件使用透明度。内联图像不允许Mask