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GDまたはImagick拡張でexif情報を削除する

GDだとCOMMENTセクションが勝手につく。

exif1.php
<?php

$gd = imagecreatefromjpeg( "in.jpg" );
$w = imagesx( $gd );
$h = imagesy( $gd );
$gd_out = imagecreatetruecolor( $w, $h );
imagecopyresampled( $gd_out, $gd, 0,0,0,0, $w,$h,$w,$h );
imagejpeg( $gd_out, "out.jpg" );
imagedestroy( $gd );

print_r( exif_read_data( "out.jpg" ) );
// exifにCOMMENTが勝手につく
// [COMMENT] => Array
// (
//  [0] => CREATOR: gd-jpeg v1.0 (using IJG JPEG v80), default quality
// )

Imagick拡張使えば何も残らない。

exif2.php
<?php

$im = new \Imagick( "in.jpg" );
$im->stripImage();
$im->writeImage( "out.jpg" );
$im->destroy();

print_r( exif_read_data( "out.jpg" ) );
// exif情報全部消える

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