Convert large TIFF file to JPG from to reduce space

I need convert large TIFF files, each size between 200MB to 2GB. Total size about 700TB.

First install the latest version imagemagick on the server.

Use convert command loop throught all the TIFF files, convert to JPG file at same folder.

Set /etc/ImageMagick-7/policy.xml before run:

<policymap>

  <!-- <policy domain="resource" name="temporary-path" value="/tmp"/> -->

  <policy domain="resource" name="memory" value="5GiB"/>

  <policy domain="resource" name="map" value="5GiB"/>

  <policy domain="resource" name="width" value="16KP"/>

  <policy domain="resource" name="height" value="16KP"/>

  <policy domain="resource" name="area" value="5GiB"/>

  <policy domain="resource" name="disk" value="5GiB"/>

 Verify the changes by command: convert -list resource

Resource limits:
  Width: 16KP
  Height: 16KP
  Area: 128MP
  Memory: 1.9573GiB
  Map: 512MiB
  Disk: 1GiB
  File: 768
  Thread: 2
  Throttle: 0
  Time: unlimited

My find loop will break on whitespace in FileName.

Check and fix any TIFF filename has whitespace in it:

find . -type f -name *tif | grep ' '

Only few, quickly replace whitespace to '_'

 

Then run my loop with convert:

for file in $(find . -type f -name \*.tif); do # Not recommended, will break on whitespace
	convert "$file"[0] -flatten -quiet -verbose "$(dirname "$file")"/"$(basename "$file" .tif).jpg"
done

'[0] -flatten' only read the top layer from TIFF files.

'-quiet -verbose' remove all tags from TIFF files.

'convert INPUT.jpg -sampling-factor 4:2:0 -strip [-resize WxH] [-quality N] [-interlace JPEG] [-colorspace Gray/sRGB] OUTPUT.jpg' using the Google Pagespeed Insights image optimization guidelines

Output Example:

./2020-01-01/_DSC9999-Touch.tif[0]=>./2020-01-01/_DSC9999-Touch.jpg TIFF 5304x7952 5304x7952+0+0 16-bit sRGB 6.878MB 5.330u 0:06.530

# Delete TIF file

find . -type f -name "*.tif" -exec rm -rf {} \;

Happy Earth Day!