php - PNG - preserving transparency -


i'm trying redesign site original square, tile-based rendering of images can more of cutout of image... rid of grid pattern.

here's how looked originally...

enter image description here

here's rough mock-up of i'm going for:

enter image description here

so resaved image thumbnail transparent background... want dog show, , square transparent show site's background underneath.

enter image description here

yet when render on page, has black background.

enter image description here

i've checked css see if there sort of img class, or class rendered comics... or bootstrap see there may background-color being assigned black (and searched hex code 000000), didn't find one...

then found had way thumbnailing script resampling png... since i'm getting black background supposedly transparent image, blame imagecreatetruecolor() returns image identifier representing black image of specified size..

i tried following cheekysoft's question here preserving transparency after resampling... didn't work... 2 main points being:

imagealphablending( $targetimage, false ); imagesavealpha( $targetimage, true );

i found if put $img = imagecreatefrompng($image_file); before resize/resample it, displays transparently... want... not after resample it.

thumbnailer.php code:

    <?php #appreciation goes digifuzz (http://www.digifuzz.net) on  $image_file = $_get['img']; //takes in full path of image $max_width = $_get['mw']; $max_height = $_get['mh']; global $img;  //check image if(!$image_file || $image_file == "") {      die("no file.");  }  //if no max width, set 1 if(!$max_width || $max_width == "") {      $max_width="100";  }  //if no max height, set 1 if(!$max_height || $max_height == "") {      $max_height = "100";  }  $img = null; //create image file 'img' parameter string if( preg_match('/\.jpg$/',$image_file) || preg_match('/\.jpeg$/',$image_file) ){      $img = imagecreatefromjpeg($image_file);  } else {      $img = imagecreatefrompng($image_file);  }   //if image loaded... if($img) {     //get image size , scale ratio     $width = imagesx($img);     $height = imagesy($img);      //takes min value of these 2     $scale = min($max_width/$width, $max_height/$height);      //if desired new image size less original, output new image     if($scale < 1) {         $new_width = floor($scale * $width);          $new_height = floor($scale * $height);           $tmp_img = imagecreatetruecolor($new_width, $new_height);          //copy , resize old image new image         imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);          //replace actual image new image         $img = $tmp_img;     } } //set content type header header('content-type: image/png', true);   imagealphablending( $img, false ); imagesavealpha( $img, true ); imagepng($img);    imagedestroy($img);  ?>

can help?

thanks!

you need call imagealphablending() on destination image before resample/resize image:

//copy , resize old image new image imagealphablending($tmp_img, false); imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height); // ...

Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers ...
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());...
Read more