修剪图像中的空格，然后使用“填充”调整图像大小 - Trim whitespace from an image then resize image with 'padding'

Trim whitespace from an image then resize image with 'padding'

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

本质上，我想获得一个可以执行以下操作的图像：

修剪图像周围所有"无聊"的空白
调整为最大 380 像素（高度和宽度）
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）

谁能给我一些关于如何使用GD/ImageMagick或任何合适的PHP脚本/库来做到这一点的提示？

到目前为止，我已经尝试了以下方法...

  $gd = imagecreatefromjpeg('./assets/temp/whitespace-img.jpg');
  imagetrim($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;
}

这个Photoshop脚本将做你想要的。请记住，修剪功能仅适用于右下角或左上角的像素颜色。如果该边界区域"脏"，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);