php Imagick获取图片RGB颜色值,
php Imagick获取图片RGB颜色值,
很多图片站点都会根据用户上传的图片检索出图片的主要颜色值,然后在通过颜色搜索相关的图片。
之前按照网上的方法将图片缩放(或者马赛克)然后遍历每个像素点,然后统计处RGB次数最多的值,这做法效率太低而且取到的RGB值不够精确。之后才发现使用Imagick的quantizeImage方法能够很方便的取到图片中平均的RGB值.
$average = new Imagick("xiaocai.jpg"); $average->quantizeImage( 10, Imagick::COLORSPACE_RGB, 0, false, false ); $average->uniqueImageColors(); function GetImagesColor( Imagick $im ){ $colorarr = array(); $it = $im->getPixelIterator(); $it->resetIterator(); while( $row = $it->getNextIteratorRow() ){ foreach ( $row as $pixel ){ // www.jbxue.com $colorarr[] = $pixel->getColor(); } } return $colorarr; } $colorarr = GetImagesColor($average); foreach($colorarr as $val){ echo "<div style='background-color: rgb({$val['r']},{$val['g']},{$val['b']});width:50px;height:50px;float:left;'></div>"; }

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