Reputation: 79

Resize image to specified size (<100 kB)

I need resize uploaded image to maximum size 100 kB. Is it possible ?

For example : image1.jpg with dimensions 1200x600 has 280kB and I need resize it to <100kB.

Upvotes: 2

Answers (6)

Lakhan

Reputation: 13226

Try this

convert DSC_0124.JPG -resize 602x400! -strip -define jpeg:extent=100KB img1.jpg

Upvotes: 2

Mark Setchell

Reputation: 207540

Recent versions of ImageMagick allow you to specify the maximum size for a JPEG file like this:

convert input.jpg -define jpeg:extent=100kb output.jpg

which does its best to get the output file under 100kB.

Upvotes: 4

Sammitch

Reputation: 32262

Short answer: No.

Long answer: It's possible, but it's probably more hassle than it's worth.

JPEGs do not have a fixed relationship between their physical dimensions and their filesize because of the algorithm used to compress the image not only takes into account the contents of the image, but also a 'quality' factor that determines how 'lossy' the compression process will be. It let's you save disk space, but your images look worse.

The best approach would be to use trial-and-error to find an image size [dimensions] that gets you to the neighbourhood of 100kB with a decent quality factor, resize to that in your script, check if the image's filesize is still too large, and start bringing down the quality if necessary.

Upvotes: 1

Dani

Reputation: 1250

If you are using a linux based server, i would recommend using imagemagick, it has a good CLI that can be interfaced easily with web languages.

There would be a few ways to approach this depending on if resolution or quality is more important to you.

Depending on image complexity, you are looking a file size between about 500K and 3K for a 1200x600 image

a command like

"imagemagick inputfile.jpg -quality 80 -resize 1200x600"

would probably work for most situations, but you could get more granular and check for file sizes and stuff and come up with a dynamic value for your quality.

Upvotes: 0