看到这位老兄的帖子来的兴趣
http://www.oschina.net/code/snippet_234517_15356
图像默认放大10倍,这样看的比较清楚......
测试用的是OSC的logo,大家看看效果如何
(图片被缩略了,新窗口打开这个地址看,2000*560的图
http://img.it-home.org/data/attachment/forum/2014pic/11033136_K1mt.png)
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PNG,GIF,JPG我都试了下,都能正常字符化 :)
-
$txt =array('A','B','C','D','E','F','G','H','I','J','K');
- //加载原始图像
- $rawImage = ImageCreateFromGIF('logo.gif');
- //获取原始图像宽高
- $rawImgWidth = ImagesX($rawImage);
- $rawImgHeigh = ImagesY($rawImage);
- //获取原始图像灰度
- $grayData = getGrayData($rawImage,$rawImgWidth,$rawImgHeigh);
- //销毁图像
- ImageDestroy($rawImage);
- //创建文字图像
- $txtImage = ImageCreate($rawImgWidth*6,$rawImgHeigh*9);
- //新图像背景色
- imagecolorallocate($txtImage,0,0,0);
- //获取最大灰度
- for($i=0;$i $maxGrayArray[$i] = max($grayData[$i]);
- }
- $maxGray = max($maxGrayArray);
- //设置灰度对应颜色
- for($i=0;$i $color = 255-round(200/$maxGray)*$i+55;
- $gray[$i] = imagecolorallocate($txtImage,$color,$color,$color);
- }
- //绘制字符
- for($y=0;$y for($x=0;$x Imagechar($txtImage,1,$x*6,$y*9,$txt[rand(0,10)],$gray[$grayData[$x][$y]]);
- }
- }
- //创建最终图像
- $Image = ImageCreate($rawImgWidth*10,$rawImgHeigh*10);
- //拉伸图像
- imagecopyresampled($Image, $txtImage, 0, 0, 0, 0,$rawImgWidth*10,$rawImgHeigh*10,$rawImgWidth*6,$rawImgHeigh*9);
- //定义文件头
- header('Content-type: image/png');
- //输出图像
- ImagePNG($Image);
- //销毁图像
- ImageDestroy($Image);
-
- /*
- 获取灰度值
- */
- function getGrayData($mImage,$mImgWidth,$mImgHeigh){
- for($mY=0;$mY for($mX=0;$mX $mRGB = Imagecolorat($mImage, $mX, $mY);
- $mR = ($mRGB >> 16) & 0xFF;
- $mG = ($mRGB >> 8) & 0xFF;
- $mB = $mRGB & 0xFF;;
- $mGrayData[$mX][$mY] = ($mR * 19595 + $mG * 38469 + $mB * 7472) >> 16;
- }
- }
- return $mGrayData;
- }
- ?>
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