When I try to merge two .pdf files using Imagemagick
convert pdf1.pdf pdf2.pdf temp.pdf
the resulting temp.pdf file seems to have very low resolution. How can I keep the resolution same as in the source files?
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Imagemagick's convert command is normally used for converting image files from one format to another, and in this case, it is possible that it is actually performing an internal conversion of sorts before outputting the two "images" (PDFs) into a single file.
I would suggest you consider using the PDF Toolkit (pdftk) instead http://www.accesspdf.com/pdftk/
From the examples on the website, this should be as simple as:
pdftk pdf1.pdf pdf2.pdf cat output temp.pdf
I always forget how to do this and find this question first when I search.
convert -density 600 file1.pdf file2.pdf -resize 50% new.pdf
The linked example has the density at 144, however, that has never been high enough to not appear pixelated.
I couldn't find any way of joining two pdf files together while keeping the resolution good and the text intact, but I figured out a way to convert it into a high resolution png file.
pdftoppm -f 1 -l 1 -aa yes -aaVector yes -png -r 300 page.pdf > tmp1.png pdftoppm -f 2 -l 2 -aa yes -aaVector yes -png -r 300 page.pdf > tmp2.png convert tmp1.png tmp2.png +append -quality 100 page.png
This takes to first two pages of page.pdf and joins them into a side by side high resolution png file.
Changing the last line to
convert tmp1.png tmp2.png +append -quality 100 page.pdf
will result in a pdf document output as I later figured out after messing around with pngtopnm, pnmtops, ps2pdf.