Show HN: Dynamic image size generator

#1

Post by ryan21030 » Wed, Aug 16, 2017, 12:35 PM UTC

Hi,

Firstly, the link to the tool - https://github.com/DrRoach/DynamicImage

I created a dynamic image sizing tool that allows images of any size to be generated on the fly. It's aims are as follows:

a) Allow users of sites to upload images of any size without the site owner having to worry about their dimensions or having to resize them.

b) Reduce load times for sites as images can be stored on their own dedicated server and be served in milliseconds.

I'd love to hear some feedback as to what you think and whether you'd consider using this tool and if not, why not?

All constructive criticism is welcome!

Re: Show HN: Dynamic image size generator

#2

Post by technimad » Wed, Aug 16, 2017, 4:09 PM UTC

I've created scripts like these as part of our home-brewed CMS system in the early 2000's.

Nice and easy dos tool. Enumerate the width and height parameters and bring down the server fast.

Better way to do it is to specify, or allow admins to specify, a set of named sizes and only allow these named sizes.

You could also think about adding parameters to determine the crop, or force aspect ratio etc. (with the same risk of dos)

Re: Show HN: Dynamic image size generator

#3

Post by coleifer » Wed, Aug 16, 2017, 4:27 PM UTC

Nginx has a module for this which you can tie into your cache: http://charlesleifer.com/blog/nginx-a-caching-thumbnailing-r...

Re: Show HN: Dynamic image size generator

#4

Post by godot » Wed, Aug 16, 2017, 4:38 PM UTC

imgix is an image CDN service (not free) that offers this feature and more. Not usually used for personal projects I guess since there is no free tier for it.

Re: Show HN: Dynamic image size generator

#5

Post by dalore » Wed, Aug 16, 2017, 4:39 PM UTC

If people are looking for a third party service that does this I would recommend cloudinary.com

Re: Show HN: Dynamic image size generator

#6

Post by Pigo » Wed, Aug 16, 2017, 4:41 PM UTC

I was playing around with some image optimization libraries a few weeks ago. This looks handy, but my wish list also includes image optimizations to reduce file size.

Re: Show HN: Dynamic image size generator

#7

Post by geon » Wed, Aug 16, 2017, 4:56 PM UTC

technimad wrote: post #2

I've created scripts like these as part of our home-brewed CMS system in the early 2000's. Nice and easy dos tool. Enumerate the width and height parameters and bring down the server fast. Better way to do it is to specify, or allow admins to specify, a set of named sizes and only allow these named sizes. You could also think about adding parameters to determine the crop, or force aspect ratio etc. (with the same ris…

Having the resizing api exposed publicly lile in the ajax example is definately a bad idea.

The second example (labeled "html") demonstrates using it entirely serverside, which would be fine. That way, only the filename of the cached file is exposed.

...Which was how I did it in the late 90's.

Re: Show HN: Dynamic image size generator

#8

Post by ShirsenduK » Wed, Aug 16, 2017, 4:57 PM UTC

Thumbor is an awesome open source solution which has proved itself in many high traffic sites.

https://github.com/thumbor/thumbor

Re: Show HN: Dynamic image size generator

#9

Post by notrheadagain » Wed, Aug 16, 2017, 5:00 PM UTC

There are SaaS for that, Uploadcare offers that for free, for instance

Re: Show HN: Dynamic image size generator

#10

Post by _eht » Wed, Aug 16, 2017, 5:21 PM UTC

godot wrote: post #4

imgix is an image CDN service (not free) that offers this feature and more. Not usually used for personal projects I guess since there is no free tier for it.

Imgix is great, but expensive as a cdn + image size on the fly company. I have been testing then for ~6 months for thumbnail generation but will be transitioning off soon. The cost is running about half of my S3 storage and transfer bill for only generating thumbs.

It's hard to justify not just creating my own thumbnails and stashing them on S3 for my use case.