At a high density like 300 dpi other than the default density 72 dpi the following ImageMagick convert command outputs blank pages. It looks strange to me.
"convert -units PixelsPerInch -density 300 $myfiles -page A4 -gravity center test.pdf"
Anyone like to exchange idea?
gravity parameter here isn't effective appropriately
(unable to align the object)
as it can't recognize the position & resolution of A4 page at 300 dpi. This is why the questioned command is outputting blank pages at 300 dpi.
We should avoid using page parameter if density is already defined. ImageMagick has a parameter called extent that can be used to define the resolution of a page at a given density (here 300 dpi). Thus we should use extent instead of page in this case in order to achieve the desired output.
For example,
resolution of A4 size page at 300 dpi is 2480x3508, thus correct command for a set density like 300 dpi shall be:
"convert -units PixelsPerInch -density 300 $myfiles -gravity center -extent 2480x3508 test.pdf"
Here, resolution of extent parameter should be proportionately equal to the set density for any specific page size.
