What is the codec that increases resolution of image upon adding further data?

On some websites I've seen images that 1st appear bit blurred and then they gradually get better in steps. What is the image codec? Is it PNG? In "The Social Network" The movie title is displayed in similar fashion. It gets more detailed gradually and finally the title appears in its full resolution. I think they've splendidly showcased a real codec that does that. What are the codecs of that sort? They are very helpful in HTTP protocol. And also in my undergrad I remember my lecturer explaining similar digital image processing mechanism.

Necktwi

Posted 2014-07-03T15:24:37.147

Reputation: 291

Answers

It's called progressive loading. For .JPG, save file as "Progressive JPEG" and that's it. Progressive .jpegs when downloading, show at full size but blurry until fully downloaded.

Eejin

Posted 2014-07-03T15:24:37.147

Reputation: 146

what abt pngs? they got adam7 interlacing algorithm. Is it similar to that of jpegs? and does every jpeg is of the sort? – Necktwi – 2014-07-03T15:37:31.223

@jmiserez for http://superuser.com/questions/776511/can-we-change-jpeg-image-size-with-out-decoding-and-re-encoding#comment-1009886 says progressive JPEG just sends a low resolution pic in the beginning.

– Necktwi – 2014-07-04T07:35:31.140

Here is a site that explains the specifications and characteristics of several different codecs.

Codec Central

injector

Posted 2014-07-03T15:24:37.147

Reputation: 888