Is Extreme Image Optimization Possible in Java? -


i attempting write image optimization software in java. first , obvious step strip exif metadata, have done successfully. tried compress images using imageio , compression quality parameter below:

filepath=chosen.getcanonicalpath()+"-temp.jpg"; file=new file(filepath); iterator<imagewriter> writers = imageio.getimagewritersbyformatname("jpg"); if (!writers.hasnext()){     throw new illegalstateexception("no writers found"); } outputstream os = new fileoutputstream(file); imagewriter writer = (imagewriter) writers.next(); imageoutputstream ios = imageio.createimageoutputstream(os); writer.setoutput(ios);  imagewriteparam param = writer.getdefaultwriteparam(); param.setcompressionmode(imagewriteparam.mode_explicit); param.setcompressionquality(0.9f); writer.write(null, new iioimage(optimized, null, null), param);

however, doesn't work well. works sort of okay when source image different format (i.e. not jpeg), when compressing jpeg jpeg, makes file size larger.

sites www.tinyjpg.com claim (and do) reduce file size of jpeg images 40%-60% no quality loss. how on earth (both procedurally , programmatically)? types of data removing, , how possible remove data no quality loss? possibly achieve in java?

any guidance and/or resources can give me appreciated!

from wikipedia - jpg - lossless further compression guess tiny jpg has been using improved algorithms developed after creation of standard tools. improved algorithms implemented in packjpg conveniently open-sourced. there doesn't appear java implementation.

as side note: packjpg claims 20% improvement while tiny jpg claims 70%. might overstatement might want test both claims anyway.


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more

ruby on rails - Seeing duplicate requests handled with Unicorn -

recently upgraded our ec2 instances c3.large in order boost more unicorn workers handle increased traffic our site. (6xworkers per machine - 2 ec2 instances). when did this, started seeing duplicate records being created! looks somehow, maybe 2 unicorn workers attempting process same request? in nginx logs see 1 [post] request particular rails controller - yet 2 records being created in database. i'm hitting kind of race condition issue - have no idea how debug this. doesn't happen time, when it's frustrating well. noticed 2 database records within 5 seconds of each other. (and yes disable button when user clicks submit button). unicorn 4.8.2 ruby 1.9.3 rails 3.2.14 any great! thanks! although may not fix problem, upgrade ruby 2.0.0. there blog mentioning idea upgrade ruby 2.0.0 if using unicorn. for example: https://www.digitalocean.com/community/articles/how-to-optimize-unicorn-workers-in-a-ruby-on-rails-app specifically: if using ruby 1.9, ...
Read more