P.S.Tip: If you notice that the PDF file conversions aren't authorized by the policy, go over to the ImageMagick policy XML file using the command- sudo nano /etc/ImageMagick-6/policy.xml. Otherwise, use -density before and -resize or -thumbnail after the input. I would think you may need to specify -density before reading in the input and then -resample afterwards to get the pixel size and density you want. But I am not an expert on this, nor know if it should be specified before or after your input with respect to pdf. density changes the dpi but not the pixel size, -resize or -thumbnail changes the pixel size but not the density, -density does both. With respect to your size and density issue, you may want to use -resample to do both. I know I can change the physical size using -resize 50x50 but until I get the resolution and format sorted I don't want to go any further.Īs a last point of interest does it matter where the options are specified in the command i.e should the -resize command be specified before the output file path or at the beginning of the command after the -density?īut for some things there are read options that need to be specified before the input, such as density for an input pdf Ideally what I would like to do is make a thumbnail image of the PDF that's no larger than 5cm tall but has a resolution of 300dpi in a tiff format.
This worked fine but produced a 72dpi image, so I added the -density 300 option and this produced a 72dpi image but had changed the image width to 300cm!!! so I tried the same -density 300 option but changed the output format to jpg and that created me a 300dpi image with the width and height being preserved at the there original dimensions which is what I was hoping for but in tif format, is this something I'm doing wrong or a limitation of the tif output format? my command was:Ĭonvert -density 300 '/Users/nikj/Desktop/2_LBP_GRILEGP_TST.pdf' '/Users/nikj/Desktop/2_LBP_GRILEGP_TST.tif' I'm new to ImageMagick and I'm having a few problems understanding the optionsįirstly I started by converting a PDF into a tif using a Terminal window on my Mac running OS 10.5.8 and ImageMagick 6.5.4-0
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