php文字添加投影 php使用Imagick给图片写文字加阴影效果

之前业务中用到的一个图片效果处理 备份下来,方便之后使用.

给图片上写文字的需求很常见. 实现起来也比较轻松

简单例子：

$canvas = new Imagick();

$canvas->newImage(500, 200, 'white');

$canvas->setImageFormat('png');

$draw = new ImagickDraw();

$draw->setFillColor(new ImagickPixel('#f00'));

$draw->setFontSize(50);

$draw->annotation(100, 60, 'welcome');

$canvas->drawImage($draw);

$draw->setFillColor(new ImagickPixel('#fff'));

$draw->setFontSize(50);

$draw->annotation(100, 120, 'welcome');

$canvas->drawImage($draw);

header("Content-type: image/{$canvas->getImageFormat()}");

echo $canvas->getImageBlob();

创建了一个白色底图, 并在上边写了两行字

一行红色的, 一行白色的. 由于底图颜色也是白色，所以 白色的字是看不到的

给文字加阴影

遇到同颜色的情况, 大部分都会采用给文字加阴影的方式

代码:

$canvas = new Imagick();

$canvas->newImage(500, 200, 'white');

$canvas->setImageFormat('png');

$text = new Imagick();

$text->newImage(500, 200, 'none');

$text->setImageFormat('png');

$draw = new ImagickDraw();

$draw->setFillColor(new ImagickPixel('#f00'));

$draw->setFontSize(50);

$draw->annotation(100, 60, 'welcome');

$text->drawImage($draw);

$draw->setFillColor(new ImagickPixel('#fff'));

$draw->setFontSize(50);

$draw->annotation(100, 120, 'welcome');

$text->drawImage($draw);

$shadow_layer = $text->clone();

$shadow_layer->setImageBackgroundColor(new ImagickPixel('#555'));

$shadow_layer->shadowImage(80, 0.8, 0, 0);

$shadow_layer->compositeImage($text, Imagick::COMPOSITE_OVER, 0, 0 );

$canvas->compositeImage($shadow_layer, imagick::COMPOSITE_DEFAULT, 0, 0);

header("Content-type: image/{$canvas->getImageFormat()}");

echo $canvas->getImageBlob();

给文字设置阴影效果后 看起来舒服多啦