GD模糊图像Opencart

Question

我在Opencart中使用GD图像处理时出现此问题，这会在调整大小后创建真实的模糊图像。到目前为止，我没有尝试过任何帮助。 下面是image.php的代码

<?php
class Image {
    private $file;
    private $image;
    private $info;

    public function __construct($file) {
        if (file_exists($file)) {
            $this->file = $file;

            $info = getimagesize($file);

            $this->info = array(
                'width'  => $info[0],
                'height' => $info[1],
                'bits'   => $info['bits'],
                'mime'   => $info['mime']
            );

            $this->image = $this->create($file);
        } else {
            exit('Error: Could not load image ' . $file . '!');
        }
    }

    private function create($image) {
        $mime = $this->info['mime'];

        if ($mime == 'image/gif') {
            return imagecreatefromgif($image);
        } elseif ($mime == 'image/png') {
            return imagecreatefrompng($image);
        } elseif ($mime == 'image/jpeg') {
            return imagecreatefromjpeg($image);
        }
    }   

    public function save($file, $quality = 100) {
        $info = pathinfo($file);

        $extension = strtolower($info['extension']);

        if (is_resource($this->image)) {
            if ($extension == 'jpeg' || $extension == 'jpg') {
                imagejpeg($this->image, $file, $quality);
            } elseif($extension == 'png') {
                imagepng($this->image, $file);
            } elseif($extension == 'gif') {
                imagegif($this->image, $file);
            }

            imagedestroy($this->image);
        }
    }

/**
*   
*   @param width 
*   @param height
*   @param default char [default, w, h]
*                  default = scale with white space, 
*                  w = fill according to width, 
*                  h = fill according to height
    *   
    */
    public function resize($width = 0, $height = 0, $default = '') {
        if (!$this->info['width'] || !$this->info['height']) {
            return;
        }

        $xpos = 0;
        $ypos = 0;
        $scale = 1;

        $scale_w = $width / $this->info['width'];
        $scale_h = $height / $this->info['height'];

        if ($default == 'w') {
            $scale = $scale_w;
        } elseif ($default == 'h'){
            $scale = $scale_h;
        } else {
            $scale = min($scale_w, $scale_h);
        }

        if ($scale == 1 && $scale_h == $scale_w && $this->info['mime'] != 'image/png')
 {
            return;
        }

        $new_width = (int)($this->info['width'] * $scale);
        $new_height = (int)($this->info['height'] * $scale);            
        $xpos = (int)(($width - $new_width) / 2);
        $ypos = (int)(($height - $new_height) / 2);

        $image_old = $this->image;
        $this->image = imagecreatetruecolor($width, $height);

        if (isset($this->info['mime']) && $this->info['mime'] == 'image/png') {     
            imagealphablending($this->image, false);
            imagesavealpha($this->image, true);
            $background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
            imagecolortransparent($this->image, $background);
        } else {
            $background = imagecolorallocate($this->image, 255, 255, 255);
        }

        imagefilledrectangle($this->image, 0, 0, $width, $height, $background);

        imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width,
 $new_height, $this->info['width'], $this->info['height']);
        imagedestroy($image_old);

        $this->info['width']  = $width;
        $this->info['height'] = $height;
    }

    public function watermark($file, $position = 'bottomright') {
        $watermark = $this->create($file);

        $watermark_width = imagesx($watermark);
        $watermark_height = imagesy($watermark);

        switch($position) {
            case 'topleft':
                $watermark_pos_x = 0;
                $watermark_pos_y = 0;
                break;
            case 'topright':
                $watermark_pos_x = $this->info['width'] - $watermark_width;
                $watermark_pos_y = 0;
                break;
            case 'bottomleft':
                $watermark_pos_x = 0;
                $watermark_pos_y = $this->info['height'] - $watermark_height;
                break;
            case 'bottomright':
                $watermark_pos_x = $this->info['width'] - $watermark_width;
                $watermark_pos_y = $this->info['height'] - $watermark_height;
                break;
        }

        imagecopy($this->image, $watermark, 
$watermark_pos_x, $watermark_pos_y, 0, 0, 120, 40);

        imagedestroy($watermark);
    }

    public function crop($top_x, $top_y, $bottom_x, $bottom_y) {
        $image_old = $this->image;
        $this->image = imagecreatetruecolor($bottom_x - $top_x, $bottom_y - $top_y);

        imagecopy($this->image, $image_old, 0, 0, $top_x, $top_y, 
$this->info['width'], $this->info['height']);
        imagedestroy($image_old);

        $this->info['width'] = $bottom_x - $top_x;
        $this->info['height'] = $bottom_y - $top_y;
    }

    public function rotate($degree, $color = 'FFFFFF') {
        $rgb = $this->html2rgb($color);

        $this->image = imagerotate($this->image, $degree,
 imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));

        $this->info['width'] = imagesx($this->image);
        $this->info['height'] = imagesy($this->image);
    }

    private function filter($filter) {
        imagefilter($this->image, $filter);
    }

    private function text($text, $x = 0, $y = 0, $size = 5, $color = '000000') {
        $rgb = $this->html2rgb($color);

        imagestring($this->image, $size, $x, $y, $text, 
imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));
    }

    private function merge($file, $x = 0, $y = 0, $opacity = 100) {
        $merge = $this->create($file);

        $merge_width = imagesx($image);
        $merge_height = imagesy($image);

        imagecopymerge($this->image, $merge, $x, $y, 0, 0, $merge_width, 
$merge_height, $opacity);
    }

    private function html2rgb($color) {
        if ($color[0] == '#') {
            $color = substr($color, 1);
        }

        if (strlen($color) == 6) {
            list($r, $g, $b) = array($color[0] . $color[1], $color[2] . $color[3],
 $color[4] . $color[5]);   
        } elseif (strlen($color) == 3) {
            list($r, $g, $b) = array($color[0] . $color[0], $color[1] . $color[1],
 $color[2] . $color[2]);    
        } else {
            return false;
        }

        $r = hexdec($r); 
        $g = hexdec($g); 
        $b = hexdec($b);    

        return array($r, $g, $b);
    }   
}
?>

正如您所看到的，质量已经设置为 100 ，因此无济于事。 我已尝试将 resize 替换为 resample - 但这不会产生任何可见结果。 但是我发现这个建议（下面的代码）来锐化图像，遗憾的是我不知道如何以及在何处使用它。特别是因为原始代码处理了多种图像类型请帮助把它放在正确的位置。

 {
$matrix = array(
  array(-1, -1, -1),
  array(-1, 16, -1),
  array(-1, -1, -1),
);

$divisor = array_sum(array_map('array_sum', $matrix));
$offset = 0; 
imageconvolution($image, $matrix, $divisor, $offset);

return $image;
}

此外，如果您有其他建议来改进此代码，非常感谢帮助！我认为这适用于整个Opencart社区，因为这已经讨论了许多次，但尚未发布工作解决方案。

Answer 1

quality参数仅适用于.jpeg张图片。 要锐化图像，您可以在imageconvolution()函数中应用resize()代码。

public function resize($width = 0, $height = 0, $default = '') {
    if (!$this->info['width'] || !$this->info['height']) {
        return;
    }

    $xpos = 0;
    $ypos = 0;
    $scale = 1;

    $scale_w = $width / $this->info['width'];
    $scale_h = $height / $this->info['height'];

    if ($default == 'w') {
        $scale = $scale_w;
    } elseif ($default == 'h') {
        $scale = $scale_h;
    } else {
        $scale = min($scale_w, $scale_h);
    }

    if ($scale == 1 && $scale_h == $scale_w && $this->info['mime'] != 'image/png') {
        return;
    }

    $new_width = (int)($this->info['width'] * $scale);
    $new_height = (int)($this->info['height'] * $scale);
    $xpos = (int)(($width - $new_width) / 2);
    $ypos = (int)(($height - $new_height) / 2);

    $image_old = $this->image;
    $this->image = imagecreatetruecolor($width, $height);

    if (isset($this->info['mime']) && $this->info['mime'] == 'image/png') {
        imagealphablending($this->image, false);
        imagesavealpha($this->image, true);
        $background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
        imagecolortransparent($this->image, $background);
    } else {
        $background = imagecolorallocate($this->image, 255, 255, 255);
    }

    imagefilledrectangle($this->image, 0, 0, $width, $height, $background);

    imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width, $new_height, $this->info['width'], $this->info['height']);

    //Image Sharpening Code

     $matrix = array(
        array(0.0, -1.0, 0.0),
        array(-1.0, 5.0, -1.0),
        array(0.0, -1.0, 0.0)
     );

     $divisor = array_sum(array_map('array_sum', $matrix));
     $offset = 0;
     imageconvolution($this->image, $matrix, $divisor, $offset);

    // End Image Sharpening Code

    imagedestroy($image_old);

    $this->info['width']  = $width;
    $this->info['height'] = $height;
}

参考文献：

• sharpen image quality with PHP gd library

• http://adamhopkinson.co.uk/blog/2010/08/26/sharpen-an-image-using-php-and-gd/