使用 itext 库在 pdf 文档中添加内联图像
add Inline image in pdf document using itext library
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，我们尝试在 pdf 中嵌入一个图像，该图像应该是不可编辑和只读的。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);
获取此图像后，在 addImage 方法中使用相同的方法。
PdfContentByte canvas = pdfStamper.getOverContent(item.getPage(0));
canvas.addImage(image, Boolean.TRUE);
调查结果 : 由于图片是Base 64字符串格式，所以生成的pdf文档中没有显示图片（如果图片不是Base 64格式，则为工作正常）。
当我们打开 pdf 时，显示以下错误：--------> "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem."
我们如何处理这种情况？
有没有其他方法可以达到这个要求。请帮忙
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 Image String : 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您的示例图像具有 iText 无法正确转换为内联图像的属性。不幸的是，它无法识别这一点并输出错误的结果 PDF。
特别是您的图像文件使用了透明度。内联图像不允许 Mask 或 SMask 条目（PDF 中的图像用于表示透明度）。因此，您的图像不能用作内联图像。
因此，iText 创建的内联图像仅包含一个黑色矩形，而透明度信息（包含线条图）被删除。
此外，您的图片使用了经过校准的 RGB 颜色 space。这种校准后的RGB颜色space不能自己内联，所以颜色space定义必须放到页面资源中。但是，iText 在创建内联图像时无法正确引用该非内联部分。
因此，iText 创建的内联图像引用了错误名称的颜色 space，导致 Adobe Reader 出现 "An error exists on this page" 错误消息。修复该参考得到一个有效的结果 PDF，显示上面提到的黑色矩形。
您在评论中解释说您的实际 objective 是为了 防止从生成的 pdf 文档中复制图像。
通常这显然是不可能的 - PDF 查看器可以访问的任何信息 在屏幕或纸上绘制 也可以通过为该任务设计的某些 PDF 处理器访问 复制到某个文件。 （让我们在这里忽略专有的、查看器特定的 DRM 扩展。）
不过，您可以尝试以普通 PDF 查看器不提供的方式绘制数据复制它。像您一样尝试使用内联图像是朝这个方向发展的一种方法。其他方法将图像包装在其他结构中，例如在一个模式中：
PdfContentByte canvas = resultandPdfStamper.getOverContent(1);
Rectangle pageSize = resultantPdfReader.getPageSize(1);
PdfPatternPainter painter = canvas.createPattern(pageSize.getWidth(), pageSize.getHeight());
painter.addImage(image);
canvas.setColorFill(new PatternColor(painter));
canvas.rectangle(0, 0, pageSize.getWidth(), pageSize.getHeight());
canvas.fill();
(AddImageInPattern 测试 testAddToPageTest3)
Adobe Acrobat Reader 此处不提供复制该图像的功能。另外，我的（诚然较旧的）Adobe Acrobat Pro 不提供复制它，只是删除它（更准确地说，删除填充有图案的整个矩形）。
不过请注意，普通 PDF 查看器提供或不提供的是移动目标...
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，我们尝试在 pdf 中嵌入一个图像，该图像应该是不可编辑和只读的。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);
获取此图像后，在 addImage 方法中使用相同的方法。
PdfContentByte canvas = pdfStamper.getOverContent(item.getPage(0));
canvas.addImage(image, Boolean.TRUE);
调查结果 : 由于图片是Base 64字符串格式，所以生成的pdf文档中没有显示图片（如果图片不是Base 64格式，则为工作正常）。
当我们打开 pdf 时，显示以下错误：--------> "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem."
我们如何处理这种情况？
有没有其他方法可以达到这个要求。请帮忙
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 Image String : 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您的示例图像具有 iText 无法正确转换为内联图像的属性。不幸的是，它无法识别这一点并输出错误的结果 PDF。
特别是您的图像文件使用了透明度。内联图像不允许 Mask 或 SMask 条目（PDF 中的图像用于表示透明度）。因此，您的图像不能用作内联图像。
因此，iText 创建的内联图像仅包含一个黑色矩形，而透明度信息（包含线条图）被删除。
此外，您的图片使用了经过校准的 RGB 颜色 space。这种校准后的RGB颜色space不能自己内联，所以颜色space定义必须放到页面资源中。但是，iText 在创建内联图像时无法正确引用该非内联部分。
因此，iText 创建的内联图像引用了错误名称的颜色 space，导致 Adobe Reader 出现 "An error exists on this page" 错误消息。修复该参考得到一个有效的结果 PDF，显示上面提到的黑色矩形。
您在评论中解释说您的实际 objective 是为了 防止从生成的 pdf 文档中复制图像。
通常这显然是不可能的 - PDF 查看器可以访问的任何信息 在屏幕或纸上绘制 也可以通过为该任务设计的某些 PDF 处理器访问 复制到某个文件。 （让我们在这里忽略专有的、查看器特定的 DRM 扩展。）
不过，您可以尝试以普通 PDF 查看器不提供的方式绘制数据复制它。像您一样尝试使用内联图像是朝这个方向发展的一种方法。其他方法将图像包装在其他结构中，例如在一个模式中：
PdfContentByte canvas = resultandPdfStamper.getOverContent(1);
Rectangle pageSize = resultantPdfReader.getPageSize(1);
PdfPatternPainter painter = canvas.createPattern(pageSize.getWidth(), pageSize.getHeight());
painter.addImage(image);
canvas.setColorFill(new PatternColor(painter));
canvas.rectangle(0, 0, pageSize.getWidth(), pageSize.getHeight());
canvas.fill();
(AddImageInPattern 测试 testAddToPageTest3)
Adobe Acrobat Reader 此处不提供复制该图像的功能。另外，我的（诚然较旧的）Adobe Acrobat Pro 不提供复制它，只是删除它（更准确地说，删除填充有图案的整个矩形）。
不过请注意，普通 PDF 查看器提供或不提供的是移动目标...