pdf_render_page {pdftools}R Documentation

Render / Convert PDF

Description

High quality conversion of pdf page(s) to png, jpeg or tiff format, or render into a raw bitmap array for further processing in R. This functionality is only available if libpoppler was compiled with cairo support.

Usage

pdf_render_page(pdf, page = 1, dpi = 72, numeric = FALSE, opw = "",
  upw = "")

pdf_convert(pdf, format = "png", pages = NULL, filenames = NULL,
  dpi = 72, opw = "", upw = "", verbose = TRUE)

poppler_config()

Arguments

pdf

file path or raw vector with pdf data

page

which page to render

dpi

resolution (dots per inch) to render

numeric

convert raw output to (0-1) real values

opw

owner password

upw

user password

format

string with output format such as "png" or "jpeg". Must be equal to one of poppler_config()$supported_image_formats.

pages

vector with one-based page numbers to render. NULL means all pages.

filenames

vector of equal length to pages with output filenames. May also be a format string which is expanded using pages and format respectively.

verbose

print some progress info to stdout

See Also

Other pdftools: pdf_info

Examples

# Rendering should be supported on all platforms now
if(poppler_config()$can_render){

# convert few pages to png
file.copy(file.path(Sys.getenv("R_DOC_DIR"), "NEWS.pdf"), "news.pdf")
pdf_convert("news.pdf", pages = 1:3)

# render into raw bitmap
bitmap <- pdf_render_page("news.pdf")

# save to bitmap formats
png::writePNG(bitmap, "page.png")
jpeg::writeJPEG(bitmap, "page.jpeg")
webp::write_webp(bitmap, "page.webp")

# Higher quality
bitmap <- pdf_render_page("news.pdf", page = 1, dpi = 300)
png::writePNG(bitmap, "page.png")

# slightly more efficient
bitmap_raw <- pdf_render_page("news.pdf", numeric = FALSE)
webp::write_webp(bitmap_raw, "page.webp")
}
[Package pdftools version 1.5 Index]