先来了解什么是图片的Exif信息
Exif是一种图象文件格式，它的数据存储与JPEG格式是完全相同的。
实际上Exif格式就是在JPEG格式头部插入了数码照片的信息，包括拍摄时的光圈、快门、白平衡、ISO、焦距、日期时间等各种和拍摄条件以及相机品牌、型号、色彩编码、拍摄时录制的声音以及全球定位系统（GPS）、缩略图等。简单地说，Exif=JPEG+拍摄参数。
因此，你可以利用任何可以查看JPEG文件的看图软件浏览Exif格式的照片，但并不是所有的图形程序都能处理Exif信息。
具体代码你可以参考下面的
<?
/**
* 获取图象信息的函数
* 一个全面获取图象信息的函数
* @access public
* @param string $img 图片路径
* @return array
*/
function GetImageInfoVal($ImageInfo,$val_arr) {
$InfoVal = "未知";
foreach($val_arr as $name=>$val) {
if ($name==$ImageInfo) {
$InfoVal = &$val;
break;
}
}
return $InfoVal;
}
function GetImageInfo($img) {
$imgtype = array("", "GIF", "JPG", "PNG", "SWF", "PSD", "BMP", "TIFF(intel byte order)", "TIFF(motorola byte order)", "JPC", "JP2", "JPX", "JB2", "SWC", "IFF", "WBMP", "XBM");
$Orientation = array("", "top left side", "top right side", "bottom right side", "bottom left side", "left side top", "right side top", "right side bottom", "left side bottom");
$ResolutionUnit = array("", "", "英寸", "厘米");
$YCbCrPositioning = array("", "the center of pixel array", "the datum point");
$ExposureProgram = array("未定义", "手动", "标准程序", "光圈先决", "快门先决", "景深先决", "运动模式", "肖像模式", "风景模式");
$MeteringMode_arr = array(
"0" => "未知",
"1" => "平均",
"2" => "中央重点平均测光",
"3" => "点测",
"4" => "分区",
"5" => "评估",
"6" => "局部",
"255" => "其他"
);
$Lightsource_arr = array(
"0" => "未知",
"1" => "日光",
"2" => "荧光灯",
"3" => "钨丝灯",
"10" => "闪光灯",
"17" => "标准灯光A",
"18" => "标准灯光B",
"19" => "标准灯光C",
"20" => "D55",
"21" => "D65",
"22" => "D75",
"255" => "其他"
);
$Flash_arr = array(
"0" => "flash did not fire",
"1" => "flash fired",
"5" => "flash fired but strobe return light not detected",
"7" => "flash fired and strobe return light detected",
);
$exif = exif_read_data ($img,"IFD0");
if ($exif===false) {
$new_img_info = array ("文件信息" => "没有图片EXIF信息");
}
else
{
$exif = exif_read_data ($img,0,true);
$new_img_info = array (
"文件信息" => "-----------------------------",
"文件名" => $exif[FILE][FileName],
"文件类型" => $imgtype[$exif[FILE][FileType]],
"文件格式" => $exif[FILE][MimeType],
"文件大小" => $exif[FILE][FileSize],
"时间戳" => date("Y-m-d H:i:s",$exif[FILE][FileDateTime]),
"图像信息" => "-----------------------------",
"图片说明" => $exif[IFD0][ImageDescription],
"制造商" => $exif[IFD0][Make],
"型号" => $exif[IFD0][Model],
"方向" => $Orientation[$exif[IFD0][Orientation]],
"水平分辨率" => $exif[IFD0][XResolution].$ResolutionUnit[$exif[IFD0][ResolutionUnit]],
"垂直分辨率" => $exif[IFD0][YResolution].$ResolutionUnit[$exif[IFD0][ResolutionUnit]],
"创建软件" => $exif[IFD0][Software],
"修改时间" => $exif[IFD0][DateTime],
"作者" => $exif[IFD0][Artist],
"YCbCr位置控制" => $YCbCrPositioning[$exif[IFD0][YCbCrPositioning]],
"版权" => $exif[IFD0][Copyright],
"摄影版权" => $exif[COMPUTED][Copyright.Photographer],
"编辑版权" => $exif[COMPUTED][Copyright.Editor],
"拍摄信息" => "-----------------------------",
"Exif版本" => $exif[EXIF][ExifVersion],
"FlashPix版本" => "Ver. ".number_format($exif[EXIF][FlashPixVersion]/100,2),
"拍摄时间" => $exif[EXIF][DateTimeOriginal],
"数字化时间" => $exif[EXIF][DateTimeDigitized],
"拍摄分辨率高" => $exif[COMPUTED][Height],
"拍摄分辨率宽" => $exif[COMPUTED][Width],
/*
The actual aperture value of lens when the image was taken.
Unit is APEX.
To convert this value to ordinary F-number(F-stop),
calculate this value's power of root 2 (=1.4142).
For example, if the ApertureValue is '5', F-number is pow(1.41425,5) = F5.6.
*/
"光圈" => $exif[EXIF][ApertureValue],
"快门速度" => $exif[EXIF][ShutterSpeedValue],
"快门光圈" => $exif[COMPUTED][ApertureFNumber],
"最大光圈值" => "F".$exif[EXIF][MaxApertureValue],
"曝光时间" => $exif[EXIF][ExposureTime],
"F-Number" => $exif[EXIF][FNumber],
"测光模式" => GetImageInfoVal($exif[EXIF][MeteringMode],$MeteringMode_arr),
"光源" => GetImageInfoVal($exif[EXIF][LightSource], $Lightsource_arr),
"闪光灯" => GetImageInfoVal($exif[EXIF][Flash], $Flash_arr),
"曝光模式" => ($exif[EXIF][ExposureMode]==1?"手动":"自动"),
"白平衡" => ($exif[EXIF][WhiteBalance]==1?"手动":"自动"),
"曝光程序" => $ExposureProgram[$exif[EXIF][ExposureProgram]],
/*
Brightness of taken subject, unit is APEX. To calculate Exposure(Ev) from BrigtnessValue(Bv), you must add SensitivityValue(Sv).
Ev=Bv+Sv Sv=log((ISOSpeedRating/3.125),2)
ISO100:Sv=5, ISO200:Sv=6, ISO400:Sv=7, ISO125:Sv=5.32.
*/
"曝光补偿" => $exif[EXIF][ExposureBiasValue]."EV",
"ISO感光度" => $exif[EXIF][ISOSpeedRatings],
"分量配置" => (bin2hex($exif[EXIF][ComponentsConfiguration])=="01020300"?"YCbCr":"RGB"),//'0x04,0x05,0x06,0x00'="RGB" '0x01,0x02,0x03,0x00'="YCbCr"
"图像压缩率" => $exif[EXIF][CompressedBitsPerPixel]."Bits/Pixel",
"对焦距离" => $exif[COMPUTED][FocusDistance]."m",
"焦距" => $exif[EXIF][FocalLength]."mm",
"等价35mm焦距" => $exif[EXIF][FocalLengthIn35mmFilm]."mm",
/*
Stores user comment. This tag allows to use two-byte character code or unicode. First 8 bytes describe the character code. 'JIS' is a Japanese character code (known as Kanji).
'0x41,0x53,0x43,0x49,0x49,0x00,0x00,0x00':ASCII
'0x4a,0x49,0x53,0x00,0x00,0x00,0x00,0x00':JIS
'0x55,0x4e,0x49,0x43,0x4f,0x44,0x45,0x00':Unicode
'0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00':Undefined
*/
"用户注释编码" => $exif[COMPUTED][UserCommentEncoding],
"用户注释" => $exif[COMPUTED][UserComment],
"色彩空间" => ($exif[EXIF][ColorSpace]==1?"sRGB":"Uncalibrated"),
"Exif图像宽度" => $exif[EXIF][ExifImageLength],
"Exif图像高度" => $exif[EXIF][ExifImageWidth],
"文件来源" => (bin2hex($exif[EXIF][FileSource])==0x03?"digital still camera":"unknown"),
"场景类型" => (bin2hex($exif[EXIF][SceneType])==0x01?"A directly photographed image":"unknown"),
"缩略图文件格式" => $exif[COMPUTED][Thumbnail.FileType],
"缩略图Mime格式" => $exif[COMPUTED][Thumbnail.MimeType]
);
}
return $new_img_info;
}
$innerhtml = "";
$exif = GetImageInfo($_GET['img']);
$innerhtml .= "<TABLE>";
foreach($exif as $name=>$val) {
$innerhtml .= "<TR><TD>{$name}</TD><TD>{$val}</TD></TR>";
}
$innerhtml .= "<TR><TD colspan=\"2\">";
if ($_GET['img']) {
$image = exif_thumbnail($_GET['img']);
} else {
$image = false;
}
if ($image!==false) {
$innerhtml .= "<img src=\"thumbnail.php?img=".$_GET['img']."\">";
} else {
// no thumbnail available, handle the error here
$innerhtml .= "No thumbnail available";
}
$innerhtml .= "</TD></TR></TABLE>";
?>
<html>
<head>
<title>图片信息</title>
<meta http-equiv="Content-Type" content="text/html; charset=??????">
</head>
<body>
<SCRIPT>
<!--
//初始化内容值
parent.followTd<?=$_GET['r_id'];?>.innerHTML='<?=$innerhtml;?>';
//已读取
parent.document.images.followImg<?=$_GET['r_id'];?>.loaded='yes';
-->
</SCRIPT>
</body>
</html>