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imagemagickimagemagick-convert

How to control the size of the output PDF?

I am trying to convert a list of images (png) to a single PDF using imagemagick.

I've tried using convert *.png -size 375 output.pdf, however the resulting PDF remains much wider than the source images.

How can I get the PDF to match the size of the images - which all have a width of 375px?

Update:

Another way to say this is:

How do I create a PDF with it's page size equal to the height of it's corresponding image?

Update:

To illustrate the problem:

enter image description here

Solution

  • Updated Answer

    I created 3 new PNG files with sizes more similar to yours using:

    convert -size 375x10000 gradient:red-cyan     1.png
convert -size 375x10000 gradient:blue-magenta 2.png
convert -size 375x10000 gradient:silver-gold  3.png

    and put them together in a 3-page PDF like this:

    convert [123].png a.pdf

    And I get this, which looks correct to me. I can only think you need to update your ImageMagick version, and/or your ghostscript version.

    enter image description here[enter image description here][enter image description here]3

    Original Answer

    Not sure what the problem is, here is what I did and it seems to work fine:

    # Synthesise 4 pages, each 375px wide
convert -size 375x800 xc:red    1.png
convert -size 375x800 xc:yellow 2.png
convert -size 375x800 xc:lime   3.png
convert -size 375x800 xc:blue   4.png

# Now assemble into a PDF
convert [1234].png output.pdf

# Check what we produced
identify -verbose output.pdf | more

Image: output.pdf
  Format: PDF (Portable Document Format)
  Mime type: application/pdf
  Class: DirectClass
  Geometry: 375x800+0+0
  Resolution: 72x72
  Print size: 5.20833x11.1111
  Units: Undefined
  Type: PaletteAlpha
  Base type: TrueColorAlpha
  ...
  ...