php bmp轉jpg的方法:先開啟「php.ini」檔案;然後開啟gd擴充庫;最後使用「changeBMPtoJPG」等方法將bmp的檔案轉換成jpg格式即可。
推薦:《PHP影片教學》
php轉換bmp圖片格式為jpg格式
進行圖片格式轉換前,先輸出phpinfo()查看php庫信息,查看gd擴充庫是否開啟,若未開啟,開啟php.ini文件,用查找工具找到extension=php_gd2 .dll,把extension=php_gd2.dll 前面的【;】,就可以了
這裡轉換成為jpg格式需要JPEG Support支持,png需要PNG Support支持,對應的先檢查自己轉的格式是否支援
imagejpeg()函數失敗也許是你的資料夾權限問題,得多注意
可以先用function_exist()函數ImageCreateFromBMP檢查是否存在,下例中的ImageCreateFromBMP_private用來取代ImageCreateFromBMP方法
範例程式碼如下:
<?php $srcFile ='test.bmp';//需要转换的图片 $info = getimagesize($srcFile); $srcFileExt=$info['mime']; //判断是否是bmp格式 if($srcFileExt=='image/x-ms-bmp'){ $result = changeBMPtoJPG($srcFile); if($result){ echo $result; }else{ echo "转换失败!"; } }else{ echo "该图片不是bmp格式"; } exit; function ImageCreateFromBMP_private($filename) { if (!$f1 = fopen($filename, "rb")) return false; $FILE = unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread($f1, 14)); if ($FILE['file_type'] != 19778) return false; $BMP = unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel' . '/Vcompression/Vsize_bitmap/Vhoriz_resolution' . '/Vvert_resolution/Vcolors_used/Vcolors_important', fread($f1, 40)); $BMP['colors'] = pow(2, $BMP['bits_per_pixel']); if ($BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset']; $BMP['bytes_per_pixel'] = $BMP['bits_per_pixel'] / 8; $BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']); $BMP['decal'] = ($BMP['width'] * $BMP['bytes_per_pixel'] / 4); $BMP['decal'] -= floor($BMP['width'] * $BMP['bytes_per_pixel'] / 4); $BMP['decal'] = 4 - (4 * $BMP['decal']); if ($BMP['decal'] == 4) $BMP['decal'] = 0; $PALETTE = array(); if ($BMP['colors'] < 16777216) { $PALETTE = unpack('V' . $BMP['colors'], fread($f1, $BMP['colors'] * 4)); } $IMG = fread($f1, $BMP['size_bitmap']); $VIDE = chr(0); $res = imagecreatetruecolor($BMP['width'], $BMP['height']); $P = 0; $Y = $BMP['height'] - 1; while ($Y >= 0) { $X = 0; while ($X < $BMP['width']) { switch ($BMP['bits_per_pixel']) { case 32: $COLOR = unpack("V", substr($IMG, $P, 3) . $VIDE); break; case 24: $COLOR = unpack("V", substr($IMG, $P, 3) . $VIDE); break; case 16: $COLOR = unpack("n", substr($IMG, $P, 2)); $COLOR[1] = $PALETTE[$COLOR[1] + 1]; break; case 8: $COLOR = unpack("n", $VIDE . substr($IMG, $P, 1)); $COLOR[1] = $PALETTE[$COLOR[1] + 1]; break; case 4: $COLOR = unpack("n", $VIDE . substr($IMG, floor($P), 1)); if (($P * 2) % 2 == 0) $COLOR[1] = ($COLOR[1] >> 4); else $COLOR[1] = ($COLOR[1] & 0x0F); $COLOR[1] = $PALETTE[$COLOR[1] + 1]; break; case 1: $COLOR = unpack("n", $VIDE . substr($IMG, floor($P), 1)); if (($P * 8) % 8 == 0) $COLOR[1] = $COLOR[1] >> 7; elseif (($P * 8) % 8 == 1) $COLOR[1] = ($COLOR[1] & 0x40) >> 6; elseif (($P * 8) % 8 == 2) $COLOR[1] = ($COLOR[1] & 0x20) >> 5; elseif (($P * 8) % 8 == 3) $COLOR[1] = ($COLOR[1] & 0x10) >> 4; elseif (($P * 8) % 8 == 4) $COLOR[1] = ($COLOR[1] & 0x8) >> 3; elseif (($P * 8) % 8 == 5) $COLOR[1] = ($COLOR[1] & 0x4) >> 2; elseif (($P * 8) % 8 == 6) $COLOR[1] = ($COLOR[1] & 0x2) >> 1; elseif (($P * 8) % 8 == 7) $COLOR[1] = ($COLOR[1] & 0x1); $COLOR[1] = $PALETTE[$COLOR[1] + 1]; break; default: return false; break; } imagesetpixel($res, $X, $Y, $COLOR[1]); $X++; $P += $BMP['bytes_per_pixel']; } $Y--; $P+=$BMP['decal']; } fclose($f1); return $res; } function changeBMPtoJPG($srcPathName){ $srcFile=$srcPathName; $dstFile = str_replace('.bmp', '.jpg', $srcPathName); $photoSize = GetImageSize($srcFile); $pw = $photoSize[0]; $ph = $photoSize[1]; $dstImage = ImageCreateTrueColor($pw, $ph); $white = imagecolorallocate($dstImage, 255, 255, 255); //用 $white 颜色填充图像 imagefill( $dstImage, 0, 0, $white); //读取图片 $srcImage = ImageCreateFromBMP_private($srcFile); //合拼图片 imagecopyresampled($dstImage, $srcImage, 0, 0, 0, 0, $pw, $ph, $pw, $ph); $judge = imagejpeg($dstImage, $dstFile, 90); imagedestroy($dstImage); if($judge){ return $dstFile; }else{ return false; } } ?
以上是php如何將bmp轉jpg格式的詳細內容。更多資訊請關注PHP中文網其他相關文章!