I suggest you to use pdfimages
instead of convert
.
With pdfimages -list Test.pdf
I obtain the list of the images of the pdf file.
page num type width height color comp bpc enc interp object ID
---------------------------------------------------------------------
1 0 image 4128 5440 gray 1 1 ccitt no 97 0
2 1 image 4112 5424 gray 1 1 ccitt no 95 0
3 2 image 4080 5440 gray 1 1 ccitt no 93 0
4 3 image 4096 5440 gray 1 1 jbig2 no 12 0
5 4 image 4176 5488 gray 1 1 jbig2 no 16 0
So the images inside your pdf have different sizes and encryption.
With the following command you will extract them all:
pdfimages test.pdf sheet
It will give progressive names sheet-000.pbm sheet-001.pbm sheet-002.pbm sheet-003.pbm sheet-004.pbm
and it will write them in pbm format.
Unfortunately the option -j
doesn't work in your specific case and you have to convert by hands:
convert sheet-001.pbm sheet-001.jpg
At this point you will have the images with their the original size.
Now the core of your question: which page size?!?
A4 210 × 297 mm at 300 dpi 2480 x 3508 Pixels
Letter 215.9 × 279.4 mm at 300 dpi 2550 x 3300 Pixels
...
Let we choose A4
.
The ratio do not fit the ratio of your pages so you can or distort it or leave with some white space over or with some white space on a side.
convert sheet-001.pbm -resize 2480x3508\! distort.jpg # you fix xy
convert sheet-001.pbm -resize 2480x Take_Width.jpg # you fix x
convert sheet-001.pbm -resize x3508 Take_Height.jpg # you fix y
To install pdfimages
you can install the poppler-utils
.
Search for your operating system.
Ps> How to do calculations
Letter 8.5 x 11 inches x 300 dpi ---> 2550 x 3300 Pixels