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- compression - How to reduce the size of a pdf file? - Ask Ubuntu
If the PDF file consists entirely of image data; pdftk inputFile pdf burst mogrify -density 300 -format jpg -quality 20 pg_* pdf convert * jpg -auto-orient outputFile pdf The density value can match the density of the source image (eg 300 dpi), but the jpeg quality should be lower than the source image (e g 20)
- Is there a command line tool to bulk extract images from a pdf?
Pdfimages reads the PDF file PDF-file, scans one or more pages, and writes one PPM, PBM, or JPEG file for each image On newer versions of poppler-utils there is an all switch to extract to jpg or png: pdfimages -all input pdf images prefix will output files in the form prefix-nnn [png|jpg] in the images folder
- How to convert PDF to image? - Ask Ubuntu
To get a single page from gm convert, add [N] (with N the page number starting at 0) to the PDF name, ie gm convert foo pdf[11] out png to get the 12th page from the PDF For pdftoppm use -f N -singlefile , where N is the page number starting at 1, ie pdftoppm -f 12 -singlefile foo pdf out for the same result
- How can I edit a picture into an existing PDF file? - Ask Ubuntu
Run Xournal or Xournal++, click File → Annotate PDF, choose your PDF file Now, go to where you need to add your signature and click Tools → Image (or the Image toolbar icon), then click where you want to add the image An image selection dialog appears, select your image Xournal's insert image is a great addition but not polished
- How can I reduce the file size of a scanned PDF file?
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1 4 -dDownsampleColorImages=true \ -dColorImageResolution=150 -dNOPAUSE -dBATCH -sOutputFile=output pdf input pdf This reduced the image resolution to 150dpi, cutting my file size in half Looking at the document, there was almost no noticeable loss of image quality
- How can I add text and images (for example, a signature) to a PDF?
Open the pdf in LibreOffice Draw and copy paste there any image, including that of a signature (or Insert -Picture - From File), which then can be easily adjusted resized to fit the purpose After that, under File - 'Export as PDF'
- Is there a simple way to identify if a PDF is scanned?
If a pdf file contains an image (inserted in a document alongside text or as whole pages, 'scanned pdf'), the file often (maybe always) contains the string Image , which can be found with the command line grep --color -a 'Image' filename pdf This will separate files which contain only text from those containing images (full page images as
- Convert a directory of JPEG files to a single PDF document
It allows you to guarantee a minimum space between image borders and PDF page borders, to allow printing the PDF without problems It does not change the image data (So image quality is unaffected, the PDF file has about the same file size as the image, and you can re-extract the original images later with pdfimages -j file pdf img ) At the
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