Hi,
if have a Problem with reading Data from a jpeg. I
have written the following code to check which data is
already readable:
$jpeg = new PelJpeg($path."images/".$fileName);
$pre_exif = $jpeg->getExif();
$tiff = $pre_exif->getTiff();
$ifd = $tiff->getIfd();
$next = true;
$num_ifd = 0;
while($next)
{
$subifds = $ifd->getSubIfds();
$num_sub = 0;
foreach ($subifds as $sub) {
$tags = $sub->getValidTags();
$num_tag = 0;
foreach ($tags as $tag)
{
print
$num_ifd.".".$num_sub.".".$num_tag.".
".PelTag::getTitle($sub, $tag).":";
$entry = $sub->getEntry($tag);
if ($entry) {
print $entry->getText();
}
print "<br>";
$num_tag++;
}
$num_sub++;
}
$num_ifd++;
if( $ifd->isLastIfd() ){
$next = false;
} else {
$ifd = $ifd->getNextIfd();
}
}
I get the following output for one first image:
0.0.0. Exposure Time:1/500 sec.
0.0.1. FNumber:f/3.0
0.0.2. Exposure Program:Normal program
0.0.3. Spectral Sensitivity:
0.0.4. ISO Speed Ratings:
0.0.5. OECF:
0.0.6. Exif Version:Exif Version 2.21
0.0.7. Date and Time (original):2007:10:21 11:45:05
0.0.8. Date and Time (digitized):2007:10:21 11:45:05
0.0.9. Components Configuration:Y Cb Cr -
0.0.10. Compressed Bits per Pixel:
0.0.11. Shutter speed:90/10 sec. (APEX: 22)
0.0.12. Aperture:f/3.0
0.0.13. Brightness:
0.0.14. Exposure Bias:0.0
0.0.15. Max Aperture Value:32/10
0.0.16. Subject Distance:
0.0.17. Metering Mode:Pattern
0.0.18. Light Source:Unknown
0.0.19. Flash:Flash did not fire, auto mode.
0.0.20. Focal Length:6.0 mm
0.0.21. Maker Note:1644 bytes unknown MakerNote data
0.0.22. User Comment:
0.0.23. SubSec Time:
0.0.24. SubSec Time Original:
0.0.25. SubSec Time Digitized:
0.0.26. Windows XP Title:
0.0.27. Windows XP Comment:
0.0.28. Windows XP Author:
0.0.29. Windows XP Keywords:
0.0.30. Windows XP Subject:
0.0.31. FlashPix Version:FlashPix Version 1.0
0.0.32. Color Space:sRGB
0.0.33. Pixel x-Dimension:1024
0.0.34. Pixel y-Dimension:768
0.0.35. Related Sound File:
0.0.36. Flash Energy:
0.0.37. Spatial Frequency Response:
0.0.38. Focal Plane x-Resolution:
0.0.39. Focal Plane y-Resolution:
0.0.40. Focal Plane Resolution Unit:
0.0.41. Subject Location:
0.0.42. Exposure index:80/1
0.0.43. Sensing Method:One-chip color area sensor
0.0.44. File Source:DSC
0.0.45. Scene Type:Directly photographed
0.0.46. CFA Pattern:
0.0.47. Custom Rendered:
0.0.48. Exposure Mode:
0.0.49. White Balance:
0.0.50. Digital Zoom Ratio:
0.0.51. Focal Length In 35mm Film:
0.0.52. Scene Capture Type:
0.0.53. Gain Control:
0.0.54. Contrast:
0.0.55. Saturation:
0.0.56. Sharpness:
0.0.57. Device Setting Description:
0.0.58. Subject Distance Range:
0.0.59. Image Unique ID:
0.0.60. Interoperability IFD Pointer:
0.0.61. Gamma:
So some Information is readable. But the
WindowsXP-Title isn't, although it is given in the
file.
Is it a bug or is something wrong with my code?
Thank you
baghira
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