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Using optimise-images.sh with new profile-age and optimise-age and optimise-cron-age modes to filter image processing by age via FIND_IMGAGE variable which takes value in minutes. If set variable to FIND_IMGAGE='1440', the script will only check and process images newer / created within the past 1440 minutes or 1 day. The optimise-cron-age mode is for use as a cronjob schedule as it removes the post-optimisation profile routine run to save time.

Usage:

./optimise-images.sh 
./optimise-images.sh {optimise} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {optimise-age} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {optimise-cron} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {optimise-cron-age} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {optimise-webp} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {optimise-webp-nginx} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {profile} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {profile-age} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {profilelog} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {testfiles} /PATH/TO/DIRECTORY/WITH/IMAGES
./optimise-images.sh {install}
./optimise-images.sh {bench}
./optimise-images.sh {bench-compare}
./optimise-images.sh {bench-webp}
./optimise-images.sh {bench-webpcompare}
./optimise-images.sh {bench} all
./optimise-images.sh {bench-compare} all
./optimise-images.sh {bench-webp} all
./optimise-images.sh {bench-webpcompare} all

profile-age run with FIND_IMGAGE='60' for images created wihtin the past 60 minutes at /home/optimise-benchmarks

./optimise-images.sh profile-age /home/optimise-benchmarks 

------------------------------------------------------------------------------
image profile filtered: 60 minutes old
image name : width : height : quality : transparency : image depth (bits) : size : user: group
------------------------------------------------------------------------------
images in /home/optimise-benchmarks
logged at /home/optimise-logs/profile-log-170817-024839.log
------------------------------------------------------------------------------
image : bees.png : 444 : 258 : 92 : False : 8 : 175275 : root : root
image : dslr_canon_eos_m6_1.jpg : 1200 : 800 : 82 : False : 8 : 160946 : root : root
image : dslr_nikon_d7200_1.jpg : 2048 : 1365 : 82 : False : 8 : 374452 : root : root
image : dslr_nikon_d7200_2.jpg : 1365 : 2048 : 82 : False : 8 : 516097 : root : root
image : png24-image1.png : 600 : 400 : 92 : False : 8 : 386063 : root : root
image : png24-interlaced-image1.png : 600 : 400 : 92 : False : 8 : 443931 : root : root
image : samsung_s7_mobile_1.jpg : 2048 : 1536 : 82 : False : 8 : 256349 : root : root
image : webp-study-source-firebreathing.png : 1024 : 752 : 92 : False : 8 : 1194070 : root : root

------------------------------------------------------------------------------
Original or Existing Images:
------------------------------------------------------------------------------
| Avg width | Avg height | Avg quality | Avg size   | Total size (Bytes) | Total size (KB) |
| --------- | ---------- | ----------- | --------   | ------------------ | --------------- |
| 1166      | 945        | 87          | 438398     | 3507183            | 3425            |

------------------------------------------------------------------------------
ImageMagick Resource Limits
------------------------------------------------------------------------------
Version: ImageMagick 6.9.9-6 Q16 x86_64 2017-08-11
Resource limits:
Width: 214.7MP
Height: 214.7MP
Area: 67.057GP
Memory: 31.226GiB
Map: 62.452GiB
Disk: unlimited
File: 196608
Thread: 4
Throttle: 0
Time: unlimited
------------------------------------------------------------------------------
Completion Time: 0.13 seconds
------------------------------------------------------------------------------

Optimise for images at /home/optimise-benchmarks

/root/tools/optimise-images/optimise-images.sh optimise-age /home/optimise-benchmarks

You would need to use normal profile mode instead of profile-age right after optimise-age runs as the new optimised images will have a newer timestamp age preventing profiling to return any images right after optimise-age run

./optimise-images.sh profile /home/optimise-benchmarks     

------------------------------------------------------------------------------
image profile 
image name : width : height : quality : transparency : image depth (bits) : size : user: group
------------------------------------------------------------------------------
images in /home/optimise-benchmarks
logged at /home/optimise-logs/profile-log-170817-031053.log
------------------------------------------------------------------------------
image : bees.png : 444 : 258 : 92 : False : 8 : 175275 : root : root
image : dslr_canon_eos_m6_1.jpg : 1200 : 800 : 82 : False : 8 : 160976 : root : root
image : dslr_nikon_d7200_1.jpg : 2048 : 1365 : 82 : False : 8 : 374463 : root : root
image : dslr_nikon_d7200_2.jpg : 1365 : 2048 : 82 : False : 8 : 516101 : root : root
image : png24-image1.png : 600 : 400 : 92 : False : 8 : 386063 : root : root
image : png24-interlaced-image1.png : 600 : 400 : 92 : False : 8 : 443931 : root : root
image : samsung_s7_mobile_1.jpg : 2048 : 1536 : 82 : False : 8 : 256357 : root : root
image : webp-study-source-firebreathing.png : 1024 : 752 : 92 : False : 8 : 1194070 : root : root

------------------------------------------------------------------------------
Original or Existing Images:
------------------------------------------------------------------------------
| Avg width | Avg height | Avg quality | Avg size   | Total size (Bytes) | Total size (KB) |
| --------- | ---------- | ----------- | --------   | ------------------ | --------------- |
| 1166      | 945        | 87          | 438404     | 3507236            | 3425            |

------------------------------------------------------------------------------
ImageMagick Resource Limits
------------------------------------------------------------------------------
Version: ImageMagick 6.9.9-6 Q16 x86_64 2017-08-11
Resource limits:
  Width: 214.7MP
  Height: 214.7MP
  Area: 67.057GP
  Memory: 31.226GiB
  Map: 62.452GiB
  Disk: unlimited
  File: 196608
  Thread: 4
  Throttle: 0
  Time: unlimited
------------------------------------------------------------------------------
Completion Time: 0.13 seconds
------------------------------------------------------------------------------