标签：watermark image-processing php

我正在尝试为上传的图像加水印.

我有一个可以正常工作的多重上传脚本,请参见下文：

           $gallery=$_GET["gallery"];
                    $album=$_GET["album"];
if(isset($_FILES['files'])){
    $errors= array();
    foreach($_FILES['files']['tmp_name'] as $key => $tmp_name ){
        $file_name = $key.$_FILES['files']['name'][$key];
        $file_size =$_FILES['files']['size'][$key];
        $file_tmp =$_FILES['files']['tmp_name'][$key];
        $file_type=$_FILES['files']['type'][$key];  
        if($file_size > 2097152){
            $errors[]='File size must be less than 2 MB';
        }       
        $query="INSERT into commerce_images (`USER_ID`,`FILE_NAME`,`FILE_SIZE`,`FILE_TYPE`, `added_by`, `gallery_id`, `sub_gallery_id`) 
        VALUES('$user','$file_name','$file_size','$file_type', '$Fname $Sname', '$gallery', '$album'); ";
        $desired_dir="uploads";
        if(empty($errors)==true){
            if(is_dir($desired_dir)==false){
                mkdir("$desired_dir", 0700);        // Create directory if it does not exist
            }
            if(is_dir("$desired_dir/".$file_name)==false){
                move_uploaded_file($file_tmp,"$desired_dir/".$file_name);
            }else{                                  // rename the file if another one exist
                $new_dir="$desired_dir/".$file_name.time();
                 rename($file_tmp,$new_dir) ;               
            }
         mysql_query($query);           
        }else{
                print_r($errors);
        }
    }
    if(empty($error)){
?>

<script>location.assign("commerce-images.php?state=new");</script>
                                        <?php
    }
}
?>

是否可以对使用我的脚本上传的所有图像加水印？

解决方法:

尽管OP的问题在加水印的确切方法上并不清楚,但我在这里使用GD库显示了文本和图像加水印功能.

将文本添加为​​水印(使用TTF字体)：Gist

function add_text_watermark($kep,$Text,$WatermarkNeeded = 1) {
    list($img_type, $Image) = getImage($kep);

$sx = imagesx($Image) ;
$sy = imagesy($Image) ;

if ($WatermarkNeeded)
    { 
    /* Set the font */
    $Font="_arial.ttf";
    $FontColor = ImageColorAllocate ($Image,204,204,204) ;
    $FontShadow = ImageColorAllocate ($Image,100,100,100) ;
    $Rotation = 0 ;
    /* Make a copy image */
    $OriginalImage = ImageCreateTrueColor($sx,$sy) ;
    ImageCopy ($OriginalImage,$Image,0,0,0,0,$sx,$sy) ;

    /* Iterate to get the size up */
    $FontSize=1 ;
    do
        {
        $FontSize *= 1.1 ;
        $Box = @ImageTTFBBox($FontSize,0,$Font,$Text);
        $TextWidth = abs($Box[4] - $Box[0]) ;
        $TextHeight = abs($Box[5] - $Box[1]) ;
        }
    while ($TextWidth < $sx*0.9 && $FontSize < 30) ;
    /*  Awkward maths to get the origin of the text in the right place */
    $x = $sx/2 - cos(deg2rad($Rotation))*$TextWidth/2 ;
    $y = $sy/2 + sin(deg2rad($Rotation))*$TextWidth/2 + cos(deg2rad($Rotation))*$TextHeight/2 ;
    /* Make shadow text first followed by solid text */

    ImageTTFText ($Image,$FontSize,$Rotation,$x+1,$y+1,$FontShadow,$Font,$Text);
    ImageTTFText ($Image,$FontSize,$Rotation,$x,$y,$FontColor,$Font,$Text);

    /* merge original image into version with text to show image through text */
    ImageCopyMerge ($Image,$OriginalImage,0,0,0,0,$sx,$sy,50) ;
    imagejpeg($Image, $kep, 100);
    }
}

function getImage($res) {
    $img = "";
    $type = "";

    if (intval(@imagesx($res)) > 0) {
        $img = $res;
    } else {
        $imginfo = getimagesize($res);

        switch($imginfo[2]) { // Determine type
            case 1:
                $type = "GIF";
                if (function_exists("imagecreatefromgif")) {
                    $img = imagecreatefromgif($res);
                } else {
                    die("Unsupported image type: $type");
                }
                break;
            case 2:
                $type = "JPG";
                if (function_exists("imagecreatefromjpeg")) {
                    $img = imagecreatefromjpeg($res);
                } else {
                    die("Unsupported image type: $type");
                }
                break;
            case 3:
                $type = "PNG";
                if (function_exists("imagecreatefrompng")) {
                    $img = imagecreatefrompng($res);
                } else {
                    die("Unsupported image type: $type");
                }
                break;
        }
    }

    return array($type, $img);
}

编辑：确保要添加为水印文本的ttf字体文件在路径中！

添加图像作为水印：Gist

function generate_watermarked_image($originalFileContents, $originalWidth, $originalHeight, $paddingFromBottomRight = 0, $watermarkFileLocation = 'logo.png') {
$watermarkImage = imagecreatefrompng($watermarkFileLocation);
$watermarkWidth = imagesx($watermarkImage);  
$watermarkHeight = imagesy($watermarkImage);

$originalImage = imagecreatefromstring($originalFileContents);

$destX = $originalWidth - $watermarkWidth - $paddingFromBottomRight;  
$destY = $originalHeight - $watermarkHeight - $paddingFromBottomRight;

// creating a cut resource
$cut = imagecreatetruecolor($watermarkWidth, $watermarkHeight);

// copying that section of the background to the cut
imagecopy($cut, $originalImage, 0, 0, $destX, $destY, $watermarkWidth, $watermarkHeight);

// placing the watermark now
imagecopy($cut, $watermarkImage, 0, 0, 0, 0, $watermarkWidth, $watermarkHeight);

// merging both of the images
imagecopymerge($originalImage, $cut, $destX, $destY, 0, 0, $watermarkWidth, $watermarkHeight, 100);

return $originalImage;
}

您可以将其称为：

$Image = "$desired_dir/".$file_name;

imagejpeg(generate_watermarked_image(file_get_contents($Image), imagesx($Image), imagesy($Image), 10), $Image."-watermarked.jpg", 100);

编辑：确保logo.png或您尝试添加为水印的任何文件都在路径中！

标签：watermark,image-processing,php
来源： https://codeday.me/bug/20191119/2038469.html

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