Hi,
Please check all the intermediate steps:
- is pdfData really a PDF? Save it into a file to check
- is the rendered image really an image? Save it into a file to check
Also look at log messages, and make sure you have the latest PDFBox
version with all the dependencies (jbig2 decoder)
Tilman
On 25.05.2023 13:24, Kristijan Milanović wrote:
Hi. I'm trying to convert base64 of PDF to base64 of JPEG.
These are my methods:
public String convertPDFtoJPEG(byte[] pdfData) {
try {
PDDocument document = PDDocument.load(pdfData);
PDFRenderer renderer = new PDFRenderer(document);
for (int pageIndex = 0; pageIndex < document.getNumberOfPages();
pageIndex++) {
BufferedImage image = renderer.renderImageWithDPI(pageIndex, 300);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "JPEG", baos);
baos.flush();
String base64JPEG =
Base64.getEncoder().encodeToString(baos.toByteArray());
baos.close();
}
document.close();
} catch (IOException e) {
e.printStackTrace();
}
return base64JPEG;
}
public byte[] readBase64FromFile(String filePath) {
File file = new File(filePath);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
String line;
while ((line = reader.readLine()) != null) {
baos.write(line.getBytes());
}
} catch (IOException e) {
e.printStackTrace();
}
return Base64.getDecoder().decode(baos.toByteArray());
}
This is how I'm calling this methods:
String filepath = "path:\\to\\file.txt"byte[] pdfData =
readBase64FromFile(filePath);
convertPDFtoJPEG(pdfData);
In file.txt is base64 of pdf that I want to convert.
Problem that I have is if a document is scanned with less than 600dpi,
that pdf doesn't convert correctly to image. Image is white without
content.
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