+I was asked to write a program to resize thousands of images which were gonna be uploaded to a website. Images had to be the same height for them to look organized in gallery. I remembered how I used imagemagick to write desktop-clock, immitate tty-clock on wallpaper. That experience helped me to design the program in my mind as we continue to speak on the phone.
-/‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾\
-| for each image |
-| do resize to height=800 |
-\___________________________/
- O
- o \_\_ _/_/
- . \__/
- (oo)\_______
- (__)\ )\/\
- ||----w |
- || ||
-This is a learning opportunity
-Since I don't have much of an experience on shell scripting, I was Ducking everything. I learned to do few things during this task.
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-
- For loops in shell script -
- Getting list of files -
- Correct syntax for resizing with ImageMagick -
After reading tutorials and looking at examples everything felt as simple as lego. I just needed to put them together.
-Here is image_shrinker.v0.1_alpha.sh :
#!/bin/sh
-mkdir ../output
-for image in ./*
-do
- convert $image -scale 1000000x800 ../output/$image
-done
-This version has problems which I can't call "feature" 😁️ :
--
-
- Resolution is hard coded. Btw, only way to define resolution is in WIDTHxHEIGHT format AFAIK. -
- Script must be in same directory as images -
- PWD must point to the directory where script is -
Adjustable resolution
-#!/bin/sh
-mkdir ../output
-WIDTH=$1 ; HEIGHT=$2
-
-for image in ./*
-do
- convert $image -scale $WIDTHx$HEIGHT ../output/$image
-done
-This fixes the hard coded resolution problem but new problem is that the user has to know that WIDTH and HEIGHT must be given. I fix that by showing correct syntax to the user and then exiting :
-#!/bin/sh
-
-if [ $# -lt 2 ]
-then
- echo "USAGE:"
- echo -e "\t\$IMAGE_DIRECTORY/image_shrinker.sh WIDTH HEIGHT"
- exit 1
-fi
-
-WIDTH=$1 ; HEIGHT=$2
-mkdir ../output
-
-for image in *
-do
- convert $image -scale $Resolution ../output/$image
-done
-Here is some other attempt to make code a bit more flexible in terms of where images can be and where output can go. Actually no but that is what I was going for 😜️
-#!/bin/sh
-
-DIR=`pwd`
-
-for image in ./*.*
-do
-# Below code will scale images to 800px height without breaking aspect ratio
- convert $DIR/$image -scale 10000x800 -write $DIR/../output/$image
-done
-It is hard to ask for help (especially after torturing with my code) but if you would like to give me feedback and advice, reply to toot of this post.
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Comments
-Toot on this thread to comment. This blog is a static site. Comments won't appear here.
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Comments !
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