Render / Convert PDF

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.

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

pdf_convert(
  pdf,
  format = "png",
  pages = NULL,
  filenames = NULL,
  dpi = 72,
  antialias = TRUE,
  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
antialias: enable antialiasing. Must be "text" or "draw" or TRUE (both) or FALSE (neither).
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

Examples

# Rendering should be supported on all platforms now
# convert few pages to png
file.copy(file.path(Sys.getenv("R_DOC_DIR"), "NEWS.pdf"), "news.pdf")
#> [1] TRUE
pdf_convert("news.pdf", pages = 1:3)
#> Converting page 1 to news_1.png... done!
#> Converting page 2 to news_2.png... done!
#> Converting page 3 to news_3.png... done!
#> [1] "news_1.png" "news_2.png" "news_3.png"

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

# save to bitmap formats
png::writePNG(bitmap, "page.png")
#> Error in loadNamespace(x): there is no package called ‘png’
webp::write_webp(bitmap, "page.webp")
#> Error in loadNamespace(x): there is no package called ‘webp’

# Higher quality
bitmap <- pdf_render_page("news.pdf", page = 1, dpi = 300)
png::writePNG(bitmap, "page.png")
#> Error in loadNamespace(x): there is no package called ‘png’

# slightly more efficient
bitmap_raw <- pdf_render_page("news.pdf", numeric = FALSE)
webp::write_webp(bitmap_raw, "page.webp")
#> Error in loadNamespace(x): there is no package called ‘webp’

# Cleanup
unlink(c('news.pdf', 'news_1.png', 'news_2.png', 'news_3.png',
 'page.jpeg', 'page.png', 'page.webp'))

Arguments

See also

Examples