I’m using convert version ImageMagick 6.6.2-6 2011-03-16, and I’d like to use it to generate an A4 pdf from an image, where the image will be non-scaled and centered.
I’m running the following (as a modification of Overlaying Images with ImageMagick):
# generate a 100x100 JPG with just red color
convert -size 100x100 xc:red red.jpg
# generate PDF from JPG
convert -page A4 xc:white red.jpg -gravity center -composite -format pdf out.pdf
… but, basically nothing shows? Same thing happens for a png image…
Note that
- Just ‘
convert -page A4 red.jpg out.pdf‘ works – but the image is not centered; (-gravity centercauses image not to show) - If the image is png, ‘
convert -page A4 -gravity center red.png out.pdf‘ does indeed work fine
… however, I’d like convert to embed the contents of the JPEG stream directly – hence, I wouldn’t like to convert the JPG to PNG first.
So, would it be possible to use convert to center a JPG image in an A4 PDF page directly?
Many thanks in advance for any answers,
Cheers!
EDIT2: @John Keyes answer works for the example above; where the image is “smaller” than the PDF size — however if the image is bigger, e.g.:
$ convert -size 1228x1706 -background \#f44 -rotate 45 gradient:\#f00-\#fff red.jpg
$ identify red.jpg
red.jpg JPEG 2075x2075 2075x2075+0+0 8-bit DirectClass 120KB 0.000u 0:00.000
… then it will fail. However, it turns out: “if you change -extent to 50×50, then play with -gravity, you’ll see changes” – except, the question is: which extent do you change, that of the image – or that of the final PDF?
Well, it turns out – it is the extent of the final PDF… To find that size as convert sees it, check the page: Magick::Geometry – however, note that the “Postscript page size specifications” like “A4+43+43>” unfortunately, cause convert to crash in this context… But at least the respective numbers for the size (595×842) can be copied from the page; and finally this works:
convert -page A4 -gravity center -resize 595x842 -extent 595x842 red.jpg out.pdf
… and actually, the -extent part is not really needed – the -resize part is the important one to have the large image show..
However, the problem here is that the image included seems to be resampled – however, I’d just like to show it scaled so it fits the page, but would otherwise like the original JPG stream to be inserted in the file.. So I guess the question is still partially open 🙂
EDIT: Related:
- ImageMagick Gravity parameter – Stack Overflow
- ImageMagick and Geometry Issue – resizing with > – Stack Overflow
- command line – Resizing and croping images to an aspect ratio of 6×4 with width of 1024 pixels – Unix and Linux – Stack Exchange
- conversion – using imagemagick or ghostscript (or something) to scale PDF to fit page? – Stack Overflow
The following works perfectly for me:
and if you change the order of the “files” it works too:
I think the red.jpg is centered but the white is drawn on top of it.