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drpain at webster dot org dot za ¶
13 years ago
Please note that when resizing images with GD and most image processing scripts or applications you will loose the EXIF information. What I did as a workaround is book this information into MySQL before I re-size images. 

<?php

// This function is used to determine the camera details for a specific image. It returns an array with the parameters.
function cameraUsed($imagePath) {

    // Check if the variable is set and if the file itself exists before continuing
    if ((isset($imagePath)) and (file_exists($imagePath))) {
    
      // There are 2 arrays which contains the information we are after, so it's easier to state them both
      $exif_ifd0 = read_exif_data($imagePath ,'IFD0' ,0);       
      $exif_exif = read_exif_data($imagePath ,'EXIF' ,0);
      
      //error control
      $notFound = "Unavailable";
      
      // Make 
      if (@array_key_exists('Make', $exif_ifd0)) {
        $camMake = $exif_ifd0['Make'];
      } else { $camMake = $notFound; }
      
      // Model
      if (@array_key_exists('Model', $exif_ifd0)) {
        $camModel = $exif_ifd0['Model'];
      } else { $camModel = $notFound; }
      
      // Exposure
      if (@array_key_exists('ExposureTime', $exif_ifd0)) {
        $camExposure = $exif_ifd0['ExposureTime'];
      } else { $camExposure = $notFound; }

      // Aperture
      if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED'])) {
        $camAperture = $exif_ifd0['COMPUTED']['ApertureFNumber'];
      } else { $camAperture = $notFound; }
      
      // Date
      if (@array_key_exists('DateTime', $exif_ifd0)) {
        $camDate = $exif_ifd0['DateTime'];
      } else { $camDate = $notFound; }
      
      // ISO
      if (@array_key_exists('ISOSpeedRatings',$exif_exif)) {
        $camIso = $exif_exif['ISOSpeedRatings'];
      } else { $camIso = $notFound; }
      
      $return = array();
      $return['make'] = $camMake;
      $return['model'] = $camModel;
      $return['exposure'] = $camExposure;
      $return['aperture'] = $camAperture;
      $return['date'] = $camDate;
      $return['iso'] = $camIso;
      return $return;
    
    } else {
      return false; 
    } 
}

?>

An example of it's use follows:

<?php

$camera = cameraUsed("/img/myphoto.jpg");
echo "Camera Used: " . $camera['make'] . " " . $camera['model'] . "<br />";
echo "Exposure Time: " . $camera['exposure'] . "<br />";
echo "Aperture: " . $camera['aperture'] . "<br />";
echo "ISO: " . $camera['iso'] . "<br />";
echo "Date Taken: " . $camera['date'] . "<br />";

?>

Will display the following, depending on the data:

Camera Used: SONY DSC-S930
Exposure Time: 1/400
Aperture: f/4.3
ISO: 100
Date Taken: 2010:12:10 18:18:45

If the image has been re-sized and the information is no longer available then you should receive the following when echoing the same:

Camera Used: Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable

Some cameras do not capture all the information, for instance Blackberry phones do not record an aperture, or iso and you will get Unavailable for those fields.  

I hope you find this helpful.
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