CODEWITHSUNDEEP
php
Biker John
Biker John

Reputation: 2711

Resize large portion of images (php or any other language)

We recently decided to redesign our old app which used 150x150 thumbnails. New thumbs are of size 250x250. Now i have to change all thumbs that were created by previous entries.

The function used for creating new thumbnails is php's imagecopyresampled.

Do you suggest resizing all the old thumbnails using php or any other more native os language / software that would resize them faster locally? (Software has to support copyresampled function or something with similar result).

Also, the job itself is a little complicated since there are some folders that has to be excluded when iterating trough the files.

level 1: company folder
level 2: company property folder, company products folder
level 3: there are images that have to be resized inside company property folder.

company 1
company 2
company 3
----company 3 property
--------image1.jpg (original size)
--------image1_thumb.jpg (old 150 thumb)
--------image2.jpg
--------image2_thumb.jpg
----company 3 products (folder also includes images but they should not be resized)

I could also use the other way and look for image names/paths in property database, but that would probably be slower than just iterating trough folders. What do you think?

Upvotes: 0

Views: 87

Answers (1)

user1129665
user1129665

Reputation:

It look like one time job? if so you use ImageMagick's convert utility to resize all thumb images at one hit:

$ convert -resize '250x250' image1.jpg image1_thumb.jpg

You can loop throght the images using proper pattern:

$ for i in $(find . -regex '.*image[0-9]+\.jpg'); do echo $i ; done
./image2.jpg
./image1.jpg
./image4.jpg
./image3.jpg
$

and convert them using the previous command:

for i in $(find . -regex '.*image[0-9]+\.jpg'); do
     convert -resize '250x250' $i $(echo $i | sed 's/.jpg/_thumb.jpg/g');
done

preview:

$ ls
image1.jpg  image2.jpg  image3.jpg  image4.jpg
$ for i in $(find . -regex '.*image[0-9]+\.jpg'); do echo $i ; done
./image2.jpg
./image1.jpg
./image4.jpg
./image3.jpg
$ for i in $(find . -regex '.*image[0-9]+\.jpg'); do
>      convert -resize '250x250' $i $(echo $i | sed 's/.jpg/_thumb.jpg/g');
> done
$ ls
image1.jpg  image1_thumb.jpg  image2.jpg  image2_thumb.jpg  image3.jpg  image3_thumb.jpg  image4.jpg  image4_thumb.jpg
$

let it runs until all images are converted.

Upvotes: 1

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