修剪图像中的空白,然后使用“填充”调整图像大小

时间:2013-09-19 10:34:17

标签: php imagemagick gd photoshop image-resizing

我不介意这是通过PHP脚本(理想情况下是Codeigniter,但任何都可以)或通过Photoshop操作完成的。

基本上我想得到一张我可以做以下的图像:

  1. 修剪图片周围所有'无聊的'空白
  2. 调整为最大380px(高度和宽度)
  3. 最后将图像填充到400px x 400px(例如在修改后的图像周围放置我自己的“白色”填充)
  4. 有人可以使用GD / ImageMagick或任何合适的PHP脚本/库向我提供有关如何执行此操作的任何提示吗?

    到目前为止,我已尝试过以下内容......

      $gd = imagecreatefromjpeg('./assets/temp/whitespace-img.jpg');
      imagetrim($gd, '#ffffff', null);
    
        function imagetrim($im, $bg, $pad=null, $output=null){
    
        // Calculate padding for each side.
        if (isset($pad)){
            $pp = explode(' ', $pad);
            if (isset($pp[3])){
                $p = array((int) $pp[0], (int) $pp[1], (int) $pp[2], (int) $pp[3]);
            }else if (isset($pp[2])){
                $p = array((int) $pp[0], (int) $pp[1], (int) $pp[2], (int) $pp[1]);
            }else if (isset($pp[1])){
                $p = array((int) $pp[0], (int) $pp[1], (int) $pp[0], (int) $pp[1]);
            }else{
                $p = array_fill(0, 4, (int) $pp[0]);
            }
        }else{
            $p = array_fill(0, 4, 0);
        }
    
        // Get the image width and height.
        $imw = imagesx($im);
        $imh = imagesy($im);
    
        // Set the X variables.
        $xmin = $imw;
        $xmax = 0;
    
        // Start scanning for the edges.
        for ($iy=0; $iy<$imh; $iy++){
            $first = true;
            for ($ix=0; $ix<$imw; $ix++){
                $ndx = imagecolorat($im, $ix, $iy);
                if ($ndx != $bg){
                    if ($xmin > $ix){ $xmin = $ix; }
                    if ($xmax < $ix){ $xmax = $ix; }
                    if (!isset($ymin)){ $ymin = $iy; }
                    $ymax = $iy;
                    if ($first){ $ix = $xmax; $first = false; }
                }
            }
        }
    
        // The new width and height of the image. (not including padding)
        $imw = 1+$xmax-$xmin; // Image width in pixels
        $imh = 1+$ymax-$ymin; // Image height in pixels
    
        // Make another image to place the trimmed version in.
        $im2 = imagecreatetruecolor($imw+$p[1]+$p[3], $imh+$p[0]+$p[2]);
    
        // Make the background of the new image the same as the background of the old one.
        $bg2 = imagecolorallocate($im2, ($bg >> 16) & 0xFF, ($bg >> 8) & 0xFF, $bg & 0xFF);
        imagefill($im2, 0, 0, $bg2);
    
        // Copy it over to the new image.
        imagecopy($im2, $im, $p[3], $p[0], $xmin, $ymin, $imw, $imh);
    
        if ($output)
        {
            imagejpeg($im2, $output);           
        }
    
        // To finish up, we replace the old image which is referenced.
        $im = $im2;
    }
    

1 个答案:

答案 0 :(得分:1)

这个Photoshop脚本会做你想要的。请记住,修剪功能仅适用于右下角或左上角像素颜色。如果边框区域是“脏”的话,这将不起作用

var srcDoc = app.activeDocument;

//trim image to transparent width
srcDoc.trim(TrimType.TOPLEFT, true, true, true, true);

var w = srcDoc.width.value;
var h = srcDoc.height.value;

if (w<h)
  {
    var imageWidth = 380;
    var imageHeight = Math.floor(w*(380/h))
  }
else
  {
    var imageHeight = 380;
    var imageWidth = Math.floor(h*(380/w))
  }

var resizeRes = 72
var resizeMethod = ResampleMethod.BICUBIC;

//resize
srcDoc.resizeImage(imageWidth, imageHeight, resizeRes, resizeMethod)

// adjust canvas size
srcDoc.resizeCanvas(400, 400, AnchorPosition.MIDDLECENTER);