Compress or resize image before rendering

Question

Refer to http://www.playframework.org/community/snippets/4

Is it possible to compress/resize the Blob image before rendering it on screen?

public static void getPicture(long id) {
   Picture picture = Picture.findById(id);
   response.setContentTypeIfNotSet(picture.image.type());
   renderBinary(picture.image.get());
}

score 2 · Accepted Answer · answered Jan 09 '12 at 19:24

You can use Image class in the play.libs package, which has a static method called resize.

The signature is

resize(java.io.File originalImage, java.io.File to, int w, int h)

You obviously need to go through extra steps to save the image to a File, to then perform the conversion, but if this is too much, you may be able to take a copy of the code and make it work with a Blob instead.

Alternatively, if there is any other third party library that works with the Blob type, then this could easily be integrated.

Note that when using this method, you may loose rotation information (see http://stackoverflow.com/questions/9453367/is-javax-imageio-imageio-broken-it-imports-some-images-as-rotated for more on that). — Samuel, Aug 09 '12 at 11:29

score 0 · Answer 2 · answered Jan 10 '12 at 05:08

If you are handling JPEG or other compressed images, you won't save much disk/bandwidth compressing the image. For the most cases you will probably just get some bytes less which are not worth the compression cost.

For resize JMagick (which is a interface for ImageMagick) is a good option. There is a small tutorial about how to resize images using JMagick.

Hope that helps

Compress or resize image before rendering

2 Answers2