PHP realizes the dynamic addition function of picture watermark according to the color environment

This article mainly introduces the function of dynamically adding image watermarks according to the color environment in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

The example of this article describes how PHP adds watermarks at different locations according to the color boundary of the image. The specific implementation method is as follows:

function add_wm($nmw_water, $src_file, $output_file, $x, $y) {    
    if(file_exists($output_file))    
      return;    
    $w1 = MagickGetImageWidth($nmw_water);    
    $h1 = MagickGetImageHeight($nmw_water);    
    $nmw =NewMagickWand();    
    MagickReadImage($nmw, $src_file);    
    // 默认的加水印位置调整    
    $lt_w = 50;    
    $lt_h = 50;    
    if($x == 0){    
      $w = MagickGetImageWidth($nmw);    
      $h = MagickGetImageHeight($nmw);    
      $x = $w;    
      $y = $h;    
    }else{    
      // 根据具体情况调整    
      $lt_w = 30;    
      $lt_h = 40;    
    }    
    MagickCompositeImage($nmw, $nmw_water, MW_OverCompositeOp, $x - $w1 - $lt_w, $y - $h1 - $lt_h);    
    MagickWriteImage($nmw, $output_file);    
    DestroyMagickWand($nmw);        
  }    
  // 还是groovy的eachFileRecurse好用啊    
  function add_wm_recurse($nmw_water, $to_dir, $output_dir, $arr) {
    $dp = dir($to_dir);    
    while($file=$dp->read()){    
      if($file != '.' && $file != '..'){    
        if(is_dir($to_dir . '/' . $file)){    
          mkdir($output_dir . '/' . $file);    
          add_wm_recurse($nmw_water, $to_dir . '/' . $file, $output_dir . '/' . $file, $arr);    
        }else{    
          if(!array_key_exists($to_dir . '/' . $file, $arr)){
            continue;    
          }    
          $sub_arr = $arr[$to_dir . '/' . $file];    
          if($sub_arr){    
            $x = intval($sub_arr[0]);    
            $y = intval($sub_arr[1]);    
            add_wm($nmw_water, $to_dir . '/' . $file, $output_dir . '/' . $file, $x, $y);    
          }    
        }    
      }    
    }    
    $dp->close();    
  }    
  $to_dir = './resized';    
  $output_dir = './output';    
  // 这个是我用java的ImageIO遍历图片像素获取的符合裤子颜色的区域的坐标array(posX, posY)    
  $arr = array(    
    array(50, 50)    
  );    
  $water = './water.png';    
  $nmw_water =NewMagickWand();    
  MagickReadImage($nmw_water, $water);    
  add_wm_recurse($nmw_water, $to_dir, $output_dir, $arr);    
  DestroyMagickWand($nmw_water);

Summary: The above is the entire article Content, I hope it will be helpful to everyone’s study.

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