白色背景调整图像大小

Question

我正在尝试修改此脚本：http://net.tutsplus.com/tutorials/php/image-resizing-made-easy-with-php/

我想要（使用裁剪选项时）白色背景而不是现在的黑色。我的情况是这样的：

当我调整图像大小时，底部出现黑色边框 (1px)，这是我不想要的。我希望这是白色的。

我查看了这个线程并尝试在脚本上实现它：How do I fill white background while resize image

但它似乎不起作用。这是我调整大小类的代码：

public function resizeImage($newWidth, $newHeight, $option="auto")
        {
            // *** Get optimal width and height - based on $option
            $optionArray = $this->getDimensions($newWidth, $newHeight, $option);

            $optimalWidth  = $optionArray['optimalWidth'];
            $optimalHeight = $optionArray['optimalHeight'];


            // *** Resample - create image canvas of x, y size
            $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);

            // MY EDIT STARTS HERE
            $backgroundColor = imagecolorallocate($this->imageResized, 255, 255, 255);
            imagefill($this->imageResized, 0, 0, $backgroundColor);
            // AND STOPS HERE

            imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);


            // *** if option is 'crop', then crop too
            if ($option == 'crop') {
                $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
            }
        }

我做错了什么，我应该改变什么？

Answer 1

Lil 很着急，所以无法编写确切的代码，但我也在尝试做类似你的事情。下面是我的代码。我把它放在 cmets 上是为了方便你。它必须对您有所帮助，但请确认。

在这段代码中，我正在创建一个趋势图像（单个图像中的多个图像组），它有多个图像的白色背景

简而言之，我会将 png 图像作为白色背景。

<?php
session_start();
include_once("../dbfunction.php");

$tid=0;
if(isset($_REQUEST) && isset($_REQUEST['tid'])){
    $tid=$_REQUEST['tid'];
}else{
    echo "Trend id not defined";
}

//This return SQL result. Multiple rows with images name, x1, y1 as initial position and x2,y2 as width height
$data=getTrendImages($tid);

//This is path of background image. For me, background image is pure white png image (480x480)
$trendsbgurl= OS_PATH."image".DIRECTORY_SEPARATOR."trends_background.png";
//Get image in PHP
$trendsbg = @imagecreatefrompng($trendsbgurl);

//Loop to get images and put them on background
for($i=0;$i<count($data);$i++){
    $imgname=$data[$i]['image_name'];
    $imgleft=$data[$i]['position_x1'];
    $imgtop=$data[$i]['position_y1'];
    $imgwidth=$data[$i]['position_x2'];
    $imgheight=$data[$i]['position_y2'];

    //Path of source image
    $imgpath=OS_PATH."original".DIRECTORY_SEPARATOR.$imgname;
    //Explode image name to get file extension. I'd to support png, gif and jpeg images
    $file=explode(".",$imgname);
    $ext=$file[1];

    //If source file exist
    if(file_exists($imgpath)){
        //Create source image in PHP
        $image=null;
        if($ext=='jpg' || $ext=='jpeg'){
            $image = @imagecreatefromjpeg($imgpath);
        }else if($ext=='png'){
            $image = @imagecreatefrompng($imgpath);
        }else if($ext=='gif'){
            $image = @imagecreatefromgif($imgpath);
        }else{
            exit;
        }
        $colorTransparent = @imagecolorat($image, 0, 0);
        //GEt source image size
        $imgsize=getimagesize($imgpath);
        //Copy source on background
        imagecopyresampled($trendsbg, $image, $imgleft, $imgtop, 0, 0, $imgwidth,         $imgheight, $imgsize[0], $imgsize[1]);
    }else{
    }
}
//I need to save image on disk. You can do whatever you need to do with $trendsbg
imagejpeg($trendsbg,OS_PATH."trendimages".DIRECTORY_SEPARATOR."t_".$tid.".jpg",100);