CODEWITHSUNDEEP
pdfbox
Shailender Jain
Shailender Jain

Reputation: 35

Image replacement using PDFBox does not change size of pdf according to image

I am using PDFBox 2.0.8 to replace image in my application. I am able to extract the image and replace the same with another image of same dimension. However, there is no decrease in the size of PDF if there is decrease in the size of image. For example refer the documents/images in the below links. Original size of PDF is 93 KB. Extracted image is 91 KB. Replaced image is 54 KB. PDF size after image replacement is still 92 KB....

  1. Original Document = http://35.200.192.44/download?fileName=/outbox/pdf/10_cert.pdf
  2. Extracted Image = http://35.200.192.44/download?fileName=/outbox/pdf/image0.jpg
  3. Replacement image = http://35.200.192.44/download?fileName=/outbox/pdf/image1.jpg
  4. PDF after replacement = http://35.200.192.44/download?fileName=/outbox/pdf/10_cert1.pdf.

The change in size of PDF after replacement is not in the same proportion... Code snippet used for image replacement is 

BufferedImage buffered_replacement_image_file = ImageIO.read(new File(replacement_image_file));
PDImageXObject replacement_img = JPEGFactory.createFromImage(doc, buffered_replacement_image_file);
resources.put(xObjectName, replacement_img);

Upvotes: 0

Views: 450

Answers (1)

mkl
mkl

Reputation: 95918

The images in your two example PDFs are identical. This most likely is due to the way you load the image data, first creating a BufferedImage from the file and then creating a PDImageXObject from that BufferedImage. This causes the input image data to be expanded to a plain bitmap and then re-compressed to JPEG identically by JPEGFactory.createFromImage.

To use the JPEG data as they initially are, try this approach instead:

PDImageXObject replacement_img = JPEGFactory.createFromStream(doc, new FileInputStream(replacement_image_file));
resources.put(xObjectName, replacement_img);

or, if the replacement_image_file is not necessarily a JPEG file, like this

PDImageXObject replacement_img = PDImageXObject.createFromFileByExtension(new File(replacement_image_file), doc);
resources.put(xObjectName, replacement_img);

If this doesn't help, you most likely have other issues in your code, too, and need to show more of it.

Upvotes: 0

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