Heim > Backend-Entwicklung > PHP-Tutorial > php 将bmp图片转为jpg等其他任意格式的图片_PHP教程

php 将bmp图片转为jpg等其他任意格式的图片_PHP教程

WBOY
Freigeben: 2016-07-21 15:46:21
Original
869 Leute haben es durchsucht

复制代码 代码如下:

php
// 例子:
$path = ROOT . ' upload/2009/06/03/124401282315771. ' ;
$pathAll = $path . ' bmp ' ;
$mi = '' ;
$mi = ImageCreateFromBMP( $pathAll );
imagejpeg( $mi , $path . ' jpg ' );
// 函数如下:
function ImageCreateFromBMP( $filename )
{
// Ouverture du fichier en mode binaire
if ( ! $f1 = fopen ( $filename , " rb " )) return FALSE ;
// 1 : Chargement des ent�tes FICHIER
$FILE = unpack ( " vfile_type/Vfile_size/Vreserved/Vbitmap_offset " , fread ( $f1 , 14 ));
if ( $FILE [ ' file_type ' ] != 19778 ) return FALSE ;
// 2 : Chargement des ent�tes BMP
$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 ;
// 3 : Chargement des couleurs de la palette
$PALETTE = array ();
if ( $BMP [ ' colors ' ] {
$PALETTE = unpack ( ' V ' . $BMP [ ' colors ' ] , fread ( $f1 , $BMP [ ' colors ' ] * 4 ));
}
// 4 : Cr�ation de l'image
$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 {
if ( $BMP [ ' bits_per_pixel ' ] == 24 )
$COLOR = unpack ( " V " , substr ( $IMG , $P , 3 ) . $VIDE );
elseif ( $BMP [ ' bits_per_pixel ' ] == 16 )
{
$COLOR = unpack ( " n " , substr ( $IMG , $P , 2 ));
$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ];
}
elseif ( $BMP [ ' bits_per_pixel ' ] == 8 )
{
$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , $P , 1 ));
$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ];
}
elseif ( $BMP [ ' bits_per_pixel ' ] == 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 ];
}
elseif ( $BMP [ ' bits_per_pixel ' ] == 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 ];
}
else
return FALSE ;
imagesetpixel( $res , $X , $Y , $COLOR [ 1 ]);
$X ++ ;
$P += $BMP [ ' bytes_per_pixel ' ];
}
$Y -- ;
$P += $BMP [ ' decal ' ];
}
// Fermeture du fichier
fclose ( $f1 );
return $res ;
}
?>

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/320174.htmlTechArticle复制代码 代码如下: ? php // 例子: $path = ROOT . ' upload/2009/06/03/124401282315771. ' ; $pathAll = $path . ' bmp ' ; $mi = '' ; $mi = ImageCreateFromBMP( $pathAll );...
Verwandte Etiketten:
Quelle:php.cn
Erklärung dieser Website
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn
Beliebte Tutorials
Mehr>
Neueste Downloads
Mehr>
Web-Effekte
Quellcode der Website
Website-Materialien
Frontend-Vorlage