Как заполнить белый фон при изменении размера изображения

Текущий фон черный. Как изменить цвет на белый?

#assuming the mime type is correct switch ($imgtype) { case 'image/jpeg': $source = imagecreatefromjpeg($source_image); break; case 'image/gif': $source = imagecreatefromgif($source_image); break; case 'image/png': $source = imagecreatefrompng($source_image); break; default: die('Invalid image type.'); } #Figure out the dimensions of the image and the dimensions of the desired thumbnail $src_w = imagesx($source); $src_h = imagesy($source); #Do some math to figure out which way we'll need to crop the image #to get it proportional to the new size, then crop or adjust as needed $width = $info[0]; $height = $info[1]; $x_ratio = $tn_w / $src_w; $y_ratio = $tn_h / $src_h; if (($x_ratio * $height) < $tn_w) { $new_h = ceil($x_ratio * $height); $new_w = $tn_w; } else { $new_w = ceil($y_ratio * $width); $new_h = $tn_h; } $x_mid = $new_w / 2; $y_mid = $new_h / 2; $newpic = imagecreatetruecolor(round($new_w), round($new_h)); imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h); $final = imagecreatetruecolor($tn_w, $tn_h); imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h); #if we need to add a watermark if ($wmsource) { #find out what type of image the watermark is $info = getimagesize($wmsource); $imgtype = image_type_to_mime_type($info[2]); #assuming the mime type is correct switch ($imgtype) { case 'image/jpeg': $watermark = imagecreatefromjpeg($wmsource); break; case 'image/gif': $watermark = imagecreatefromgif($wmsource); break; case 'image/png': $watermark = imagecreatefrompng($wmsource); break; default: die('Invalid watermark type.'); } #if we're adding a watermark, figure out the size of the watermark #and then place the watermark image on the bottom right of the image $wm_w = imagesx($watermark); $wm_h = imagesy($watermark); imagecopy($final, $watermark, $tn_w - $wm_w, $tn_h - $wm_h, 0, 0, $tn_w, $tn_h); } if (imagejpeg($final, $destination, $quality)) { return true; } return false; }

Черно-белый

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Related of "Как заполнить белый фон при изменении размера изображения"

 $final = imagecreatetruecolor($tn_w, $tn_h); $backgroundColor = imagecolorallocate($final, 255, 255, 255); imagefill($final, 0, 0, $backgroundColor); //imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h); imagecopy($final, $newpic, (($tn_w - $new_w)/ 2), (($tn_h - $new_h) / 2), 0, 0, $new_w, $new_h);

Вот ваш весь сценарий (проверенный с портретом, пейзажем и квадратным jpg):

 <?php function resize($source_image, $destination, $tn_w, $tn_h, $quality = 100, $wmsource = false) { $info = getimagesize($source_image); $imgtype = image_type_to_mime_type($info[2]); #assuming the mime type is correct switch ($imgtype) { case 'image/jpeg': $source = imagecreatefromjpeg($source_image); break; case 'image/gif': $source = imagecreatefromgif($source_image); break; case 'image/png': $source = imagecreatefrompng($source_image); break; default: die('Invalid image type.'); } #Figure out the dimensions of the image and the dimensions of the desired thumbnail $src_w = imagesx($source); $src_h = imagesy($source); #Do some math to figure out which way we'll need to crop the image #to get it proportional to the new size, then crop or adjust as needed $x_ratio = $tn_w / $src_w; $y_ratio = $tn_h / $src_h; if (($src_w <= $tn_w) && ($src_h <= $tn_h)) { $new_w = $src_w; $new_h = $src_h; } elseif (($x_ratio * $src_h) < $tn_h) { $new_h = ceil($x_ratio * $src_h); $new_w = $tn_w; } else { $new_w = ceil($y_ratio * $src_w); $new_h = $tn_h; } $newpic = imagecreatetruecolor(round($new_w), round($new_h)); imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h); $final = imagecreatetruecolor($tn_w, $tn_h); $backgroundColor = imagecolorallocate($final, 255, 255, 255); imagefill($final, 0, 0, $backgroundColor); //imagecopyresampled($final, $newpic, 0, 0, ($x_mid - ($tn_w / 2)), ($y_mid - ($tn_h / 2)), $tn_w, $tn_h, $tn_w, $tn_h); imagecopy($final, $newpic, (($tn_w - $new_w)/ 2), (($tn_h - $new_h) / 2), 0, 0, $new_w, $new_h); #if we need to add a watermark if ($wmsource) { #find out what type of image the watermark is $info = getimagesize($wmsource); $imgtype = image_type_to_mime_type($info[2]); #assuming the mime type is correct switch ($imgtype) { case 'image/jpeg': $watermark = imagecreatefromjpeg($wmsource); break; case 'image/gif': $watermark = imagecreatefromgif($wmsource); break; case 'image/png': $watermark = imagecreatefrompng($wmsource); break; default: die('Invalid watermark type.'); } #if we're adding a watermark, figure out the size of the watermark #and then place the watermark image on the bottom right of the image $wm_w = imagesx($watermark); $wm_h = imagesy($watermark); imagecopy($final, $watermark, $tn_w - $wm_w, $tn_h - $wm_h, 0, 0, $tn_w, $tn_h); } if (imagejpeg($final, $destination, $quality)) { return true; } return false; } resize('teszt2.jpg', 'out.jpg', 100, 100); ?> <img src="out.jpg">

Это работает для меня. Хотя логически кажется, что он должен заполнить весь образ с помощью $ bgcolor, он заполняет только части, которые находятся «позади» повторно сэмплированного изображения.

 imagecopyresampled($resized_image, $original_image, $xoffset, $yoffset, 0, 0, $new_width, $new_height, $orig_width, $orig_height); $bgcolor = imagecolorallocate($resized_image, $red, $green, $blue); imagefill($resized_image, 0, 0, $bgcolor);