PDF to JPG/PNG wrong dimensions in Rails

Question

When i'm running convert via command line

convert -verbose -density 300 -trim -quality 100 1565_002.pdf test_image.png

the result is good. Verbose showing output:

"gs" -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r400x400" "-sOutputFile=/var/tmp/magick-39357qEey9jeURtmJ%d" "-f/var/tmp/magick-39357DTf85TEO2pfX" "-f/var/tmp/magick-39357aIeGxsC4sZlD" /var/tmp/magick-39357qEey9jeURtmJ1 PNG 3400x4400 3400x4400+0+0 8-bit sRGB 144KB 0.300u 0:00.289

1565_002.pdf PNG 3400x4400 3400x4400+0+0 16-bit sRGB 144KB 0.000u 0:00.000

1565_002.pdf=>test_image.png PNG 3400x4400=>2778x3582 3400x4400+311+233 8-bit sRGB 2c 39.4KB 0.410u 0:00.420

BUT when uploading pdf via rails

  has_attached_file :photo,
                # ...storage options...
                :styles => { :pdf_thumbnail => ["", :png] },
                :convert_options => { 
                  :all => '-auto-orient',
                  :pdf_thumbnail => "-verbose -density 300 -trim -quality 100"
                }

The result is VERY poor.

Rails (paperclip) + Verbose output:

Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/3d/td4xb1s56wxb1tcrl8rgy6tw0000gn/T/1565_00220150206-39272-wftjey.pdf[0]'

Command :: convert '/var/folders/3d/td4xb1s56wxb1tcrl8rgy6tw0000gn/T/1565_00220150206-39272-wftjey.pdf[0]' -auto-orient -verbose -density 300 -trim -quality 100 -auto-orient '/var/folders/3d/td4xb1s56wxb1tcrl8rgy6tw0000gn/T/1565_00220150206-39272-wftjey20150206-39272-1qf97j3.png'

/var/folders/3d/td4xb1s56wxb1tcrl8rgy6tw0000gn/T/1565_00220150206-39272-wftjey.pdf[0]=>/var/folders/3d/td4xb1s56wxb1tcrl8rgy6tw0000gn/T/1565_00220150206-39272-wftjey20150206-39272-1qf97j3.png PNG 612x792=>500x645 612x792+56+42 8-bit sRGB 2c 4.06KB 0.010u 0:00.020

The problem is here - "PNG 612x792=>500x645 612x792+56+42" instead of "PNG 3400x4400 3400x4400+0+0".

So how this could be fixed? Or what option should i add.

I'm using rails (4.0.2), paperclip (3.5.2), rmagick (2.13.4)

Pretto Pretto · Accepted Answer · 2015-02-06T17:20:41

Finally, i tried these solution - https://gist.github.com/bastien/3059321

There additional ghostscript setup which transform pdf with more deeper pixel per inch value (originally was r144 and i've changed it to r400) and other custom options.

PDF to JPG/PNG wrong dimensions in Rails

1 Answers