Categories
Latest post
Convert PDF file to images
Sometime, we need display PDF file on website instead of a direct link because not all users has Adobe Reader installed and integrated in web browser to read it directly.
Sometime, we need display PDF file on website instead of a direct link because not all users has Adobe Reader installed and integrated in web browser to read it directly.
To make it attractive, there are javascript library built for it such as "turn4j". However, we need convert PDF file to images then let the library generate a reader with page-turn animation
In the scope of this article, I would like to share the way to convert PDF files using command-line in Ubuntu: poppler-utils
First of all, install the package:
sudo apt-get install poppler-utils
Then use utility pdftoppm to convert:
pdftoppm -png /path/to/pdf/file.pdf prefix
-png is image format you need
prefix is used in extracted images file. e.g.: prefix_0001.png
The default output resolution is 150dpi. We can specify to get higher resolution images:
pdftoppm -rx 300 -ry 300 -png file.pdf prefix
Here are other options you may use:
| -o | print only odd pages |
| -e | print only even pages |
| -r <fp> | resolution, in DPI (default is 150) |
| -rx <fp> | X resolution, in DPI (default is 150) |
| -ry <fp> | Y resolution, in DPI (default is 150) |
| -png | generate a PNG file |
| -jpeg | generate a JPEG file |
| -tiff | generate a TIFF file |
| -tiffcompression <string> | set TIFF compression: none, packbits, jpeg, lzw, deflate |
| -freetype <string> | enable FreeType font rasterizer: yes, no |
| -aa <string> | enable font anti-aliasing: yes, no |
| -opw <string> | owner password (for encrypted files) |
| -upw <string> | user password (for encrypted files) |