Question

I m putting together a Web site that makes heavy use of images. Those images need to be thumbnailed at various sizes to fit different templates.

I m aware of solutions like sorl-thumbnail, which seems perfect in every way except one: I need to be able to override automatic resizing and cropping if the computer s choice is a bad one.

For instance: Say I upload a 1,000-by-1,000 pixel image. I need a 300-by-200 thumbnail of that image. The sorl-thumbnail solution, if I understand it right, is to rescale the image to 300-by-300 and then lop off the top and the bottom.

What I want to be able to do is a) accept the sorl-style solution if it works for the image, but b) be able to override the sorl choice -- in the admin, probably -- if that would work better. If it s a picture of a person, for example, maybe I would rather crop out the person s torso and just make a thumbnail out of her face, which happens to be located in the upper right corner?

There s no off-the-shelf pluggable solution for this, so far as I can tell (but please correct me if I m wrong). Barring that, I d like to hear your ideas about ways that the problem might be approached. Is there some sort of jQuery plugin that will get me halfway there?

Help!

Answer 1

sorl-thumbnail has smart cropping which will cut off the parts of the image with the least entropy. All you need to do is add crop="smart". It works really really well in most situations.

Otherwise you could check out django-imagehandler

Answer 2

If you want to use an off-the-shelf pluggable there is ~~django-photologue~~ django-imagehandler. It allows you to generate thumbnails and do "manual-cropping" on the admin.

Another off-the-shelf solution is django-thumbs. django-thumbs overwrittes your imagefields. The only drawback is that you need to set up the sizes it will generate the thumbnails.

None of these 2 applications can fully solve your problem. But atleast you know where to start :)

django-photologue can generate thumbnails and add effects and watermarks.

EDIT: if you want to use jQuery to crop your images then you can take a look at jCrop. It s pretty easy to use. The main problem is that you will need to upload the image to your server and then crop it manually.

EDIT 2:Wrong information. It was not django-photologue but django-imagehandler.

友情链接