Question

我在image_creator中有图像创建代码。

<?php
header("Content-Type: image/jpeg");
$im = ImageCreateFromGif("photo.gif"); 
$black = ImageColorAllocate($im, 255, 255, 255);
$start_x = 10;
$start_y = 20;
Imagettftext($im, 12, 0, $start_x, $start_y, $black, 'verdana.ttf', "text to write");
Imagejpeg($im, '', 100);
ImageDestroy($im);
?>

图像输出文件是image.php，代码

<html>
<head>
</head>
<body>
    <img src="http://localhost/image_creator.php"/> 
</body>

</html>

当我运行image.php时，我只得到一个空白页面。为什么会这样？

Answer 1

使用此功能将文字添加到图像（从PHP for Kids复制）

<?php
      //Set the Content Type
      header('Content-type: image/jpeg');

      // Create Image From Existing File
      $jpg_image = imagecreatefromjpeg('sunset.jpg');

      // Allocate A Color For The Text
      $white = imagecolorallocate($jpg_image, 255, 255, 255);

      // Set Path to Font File
      $font_path = 'font.TTF';

      // Set Text to Be Printed On Image
      $text = "This is a sunset!";

      // Print Text On Image
      imagettftext($jpg_image, 25, 0, 75, 300, $white, $font_path, $text);

      // Send Image to Browser
      imagejpeg($jpg_image);

      // Clear Memory
      imagedestroy($jpg_image);
    ?>

Answer 2

这里的问题是， $black = ImageColorAllocate($im, 255, 255, 255); //＆lt; ==这不是黑色，它是白色的 //对于黑色它应该是，

$black = ImageColorAllocate($im, 0, 0, 0);

Answer 3

这里的问题是

$black = ImageColorAllocate($im, 255, 255, 255);

这不是黑色，它的白色。对于黑色应该是，

$black = ImageColorAllocate($im, 0, 0, 0);

如何使用PHP GD库向图像添加文本

3 个答案: