Hi,
We have a PDF document with an image on each page and we have code to
extract and process those images in a Java program.
We used to have the following lines of code to extract an image from a
PDF page using PDFBox 1.8.13 and the time it takes is 119 milliseconds.
PDDocument document = PDDocument.load(file);
PDDocumentCatalog pdc = document.getDocumentCatalog();
List pages = pdc.getAllPages();
Iterator iter = pages.iterator();
while (iter.hasNext()) {
PDPage pg = (PDPage) iter.next();
BufferedImage bi = pg.convertToImage(BufferedImage.TYPE_BYTE_GRAY,
288);
.... Code that processes the above buffered image
}
But when we moved to PDFBox 2.0.9 we had to convert the above code to the
following as convertToImage is deprecared ,but this code is taking 4 to 10
times more time (823 milliseconds compared to 119 in previous version as an
example for a page). Is there any better way of extracting the image with
288 DPI and have the performance of the old version of API?
PDDocument document = PDDocument.load(file);
PDFRenderer pdfRenderer = new PDFRenderer(document);
int totalPages = document.getNumberOfPages();
int currentPageCount = -1;
while (++currentPageCount < totalPages) {
BufferedImage bi = pdfRenderer.renderImageWithDPI(currentPageCount,
288, ImageType.GRAY);
.... Code that processes the above buffered image
}
Regards
