android - Image size is increased when converted from jpg to webp with quality value 100 -


i want replace .png , .jpg files in android project .webp reduce app size.

i verifying these 3 cases jpg webp conversion(for both .png , .jpg) :

  1. lossy 80% quality
  2. lossy 100% quality
  3. lossless

for case 1, size reduced ~30% expected

but cases 1 , 2, size increased significantly(170kb of .jpg 470kb of .webp) instead of decreasing.

command used :

cwebp -q 100 input.jpg -o output.webp

this working fine .png images 3 cases sizes reduced when converted .webp format.

but same not working .jpg image ? size reduction depend on .jpg image ? size guaranteed reduce when converted .jpg/.png .webp ? why did size increase ?

version of libwebp : libwebp-0.4.3 os - windows 64-bit

the problem face jpeg there large number of variables can manipulate different compression. benefit lossy compression. lossless compression tends have few (if options). in lossless compression, tradeoff time vs. compression. in lossy quality vs. compression.

you running lossy compressed image through second lossy compression process , getting rather unpredictable results.

the real comparison take png images , compress them using webp , jpeg using various settings see quality compared compression.


Comments

Post a Comment

Popular posts from this blog

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

php - Bypass Geo Redirect for specific directories -

i'm trying bypass redirect specific url within site. wondering if might able help. the code below code use, original urls replaces example.com i'd able access http://example.com/admin without redirect occuring. is there way this, , there way using own ip? function country_geo_redirect() { $country = getenv('http_geoip_country_code'); if ($country == "us" ) { wp_redirect("http://usa.example.com/"); exit; } else if ($country == "gb" ) { wp_redirect("http://uk.example.com/"); exit; } } add_action('init', 'country_geo_redirect'); you can bypass redirection code if server found ip address. if ip address == <my ip address> ' nothing here else country_georedirect() end if
Read more

php - .htaccess mod_rewrite for dynamic url which has domain names -

i want convert url ex:( example.com/link.php?url=facebook.com ) ( example.com/facebook.com.php ) how can using .htaccess. or there other process make job easier ? i tried adding script .htaccess file options +followsymlinks rewriteengine on rewriterule url-(.*)\.htm$ link.php?url=$1 but converting url adding "url-" ( example.com/url-facebook.com.php ) i want remove "url-" , want make ( example.com/facebook.com.php ) rewriteengine on rewritecond %{the_request} ^get.*link\.php\?url\= [nc] rewritecond %{request_uri} !/system/.* [nc] rewriterule (.*?)link\.php\?url\=/*(.*) /$1$2 [r=301,ne,l] not sure how above work edit of used use remove index.php url
Read more