Hi Nigel
On the Sample i've sent you, where i created 10 small images, 10 Shapesquares and some texts, the PDF size difference between
Native and PDFium is massive.
Native saves a 3Mb PDF and PDFium a 48Mb PDF.
Is the PDFium engine saving the pictures in uncompressed bitmap format?
So there is no way to compress stuff with the PDFium engine?
Also as the image for the test is 10 times the same image in repeat, the pdf standard is able to reference a single instance of an image
as far as i know. (save 1, use many times).
There are some discusions about saving in JPEG with pdfium (althrough in Rust).
https://github.com/ajrcarey/pdfium-render/issues/184
a sample From a file:
use pdfium_render::prelude::*;
fn main() -> Result<(), PdfiumError> {
let pdfium = Pdfium::new(Pdfium::bind_to_library("../pdfium/libpdfium.so").unwrap());
let mut document = pdfium.create_new_pdf().unwrap();
let mut page = document
.pages_mut()
.create_page_at_start(PdfPagePaperSize::a4())
.unwrap();
let mut object = PdfPageImageObject::new_from_jpeg(&document, "./pexels-rdne-8903303.jpg")?;
object.scale(500.0, 500.0)?;
page.objects_mut().add_image_object(object)?;
document.save_to_file("output.pdf")
}
--------------------------------------------------------
or one sample from a buffer:
use pdfium_render::prelude::*;
use std::fs::File;
use std::io::BufReader;
fn main() -> Result<(), PdfiumError> {
let pdfium = Pdfium::new(Pdfium::bind_to_library("../pdfium/libpdfium.so")?);
let mut document = pdfium.create_new_pdf()?;
let mut page = document
.pages_mut()
.create_page_at_start(PdfPagePaperSize::a4())?;
let mut object = PdfPageImageObject::new_from_jpeg_reader(
&document,
BufReader::new(File::open("./pexels-rdne-8903303.jpg").map_err(PdfiumError::IoError)?),
)?;
object.scale(500.0, 500.0)?;
page.objects_mut().add_image_object(object)?;
document.save_to_file("output.pdf")
} |
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PDFium PDF size
Posted - Apr 01 2025 : 07:46:39
