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php 如何将image图片转化为字符串

2019-06-13 09:04:08来源：博客园阅读 ()

前两天研究php中的 imagick 扩展的时候，突发奇想实现的一个小功能感觉挺有意思，在这里记录一下：

将一张image图片转化为字符串的形式，先上一张效果图。（运行笔记中的代码需要先安装 php_imagick 扩展教程可以看这里：PHP扩展之 Imagick安装）

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原图：

<?php
/**
* 图片转换为字符图
* @param string $imagePath 图片地址
* @param int $width x轴方向缩放比例
* @param int $height y轴方向缩放比例
* @return string 生成的字符串图
*/
function img2String($imagePath,$width=1,$height=1)
{
    //检查是否安装 php_imagick 扩展
    if(!extension_loaded("imagick")){
        exit("请先安装 imagick 模块");
    }
    $imagick = new \Imagick(realpath($imagePath));
    //将生成的imagick对象转化为一个像素迭代器，可以从该迭代器中获取没个像素的 rgb 的值。不知道什么是rgb的请问度娘
    $imageIterator = new \ImagickPixelIterator($imagick);
     $str='O80GCLft*+;:,. ';
    foreach ($imageIterator as $rows => $pixels) {
            if($rows%$width == 1 || $width == 1){
                echo "\n";
                foreach ($pixels as $column => $pixel) {
                    if($column%$height == 1 || $height == 1){
                        //灰度计算公式  某个像素点的灰度值 = 红色值*0.3 + 绿色值 * 0.59 + 蓝色值 * 0.11
                        $gray = $pixel->getColor()['r']*0.3 + $pixel->getColor()['g']*0.59 + $pixel->getColor()['b']*0.11;
                        //由于 rgb 三原色的数值范围在 [0,255] 所以求出的灰度值的范围也是 [0,255],所以我们计算像素的 "饱和度" = 灰度值/255;
                        $r = $gray/255;
                        //根据像素的 "饱和度" 选择合适的字符
                        $offset=(int)ceil($r*(strlen($str)-1));    
                        if($offset==(strlen($str)-1)){
                            echo " ";
                        }else{
                            echo $str[$offset];  
                        }
                    }         
                }
                $imageIterator->syncIterator();
            }    
    }
}

img2String('huawei.jpg',2,1);