EXIF Data - DPChallenge Forums

Canon EF-S 18-55mm f/3.5-5.6 USM

01/10/2005 05:00:58 PM · #1

I know how to view the EXIF information.

What I don't know, is how to determine if it is an untouched original.

What is the difference in the EXIF between an untouched and a nmodified photo?

Thank you for your help.

Ray

Canon EF 100mm f/2.8 USM Macro

01/10/2005 05:12:47 PM · #2

These are from my original and modified image:

Original EXIF:

Make - Canon
Model - Canon EOS 10D
Orientation - Top left
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2004:12:31 15:37:14
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/40 seconds
FNumber - 6.30
ISOSpeedRatings - 100
ExifVersion - 220
DateTimeOriginal - 2004:12:31 15:37:14
DateTimeDigitized - 2004:12:31 15:37:14
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 3 (bits/pixel)
ShutterSpeedValue - 1/40 seconds
ApertureValue - F 6.30
ExposureBiasValue - 0.00
MaxApertureValue - F 5.00
MeteringMode - Multi-segment
Flash - Not fired
FocalLength - 140 mm
UserComment -
FlashPixVersion - 100
ColorSpace - sRGB
ExifImageWidth - 3072
ExifImageHeight - 2048
InteroperabilityOffset - 2330
FocalPlaneXResolution - 3443.95
FocalPlaneYResolution - 3442.02
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Manual
WhiteBalance - Auto
SceneCaptureType - Standard

Maker Note (Vendor): -
Macro mode - Off
Self timer - Off
Quality - Fine
Flash mode - Not fired
Sequence mode - Single or Timer
Focus mode - AI Focus
Image size - Large
Easy shooting mode - Manual
Digital zoom - None
Contrast - Normal
Saturation - Normal
Sharpness - Normal
ISO Value - 100
Metering mode - Evaluative
Focus type - Auto
AF point selected -
Exposure mode - Manual
Focal length - 80 - 400 mm
Flash activity - Not fired
Sequence number - 0
White Balance - Auto
Image Type - IMG:EOS 10D JPEG
Firmware Version - Firmware Version 2.0.1
Camera Serial Number - ######### (DELETED)
Image Number - 2171721
Owner Name - Robin L. Holden, Sr.

Modified EXIF:

Make - Canon
Model - Canon EOS 10D
Orientation - Top left
XResolution - 360
YResolution - 360
ResolutionUnit - Inch
Software - Adobe Photoshop CS Windows
DateTime - 2005:01:01 03:04:38
YCbCrPositioning - Centered
ExifOffset - 220
ExposureTime - 1/40 seconds
FNumber - 6.30
ISOSpeedRatings - 100
ExifVersion - 220
DateTimeOriginal - 2004:12:31 15:37:14
DateTimeDigitized - 2004:12:31 15:37:14
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 3 (bits/pixel)
ShutterSpeedValue - 1/40 seconds
ApertureValue - F 6.30
ExposureBiasValue - 0.00
MaxApertureValue - F 5.00
MeteringMode - Multi-segment
Flash - Not fired
FocalLength - 140 mm
UserComment -
FlashPixVersion - 100
ColorSpace - Uncalibrated
ExifImageWidth - 2700
ExifImageHeight - 3420
FocalPlaneXResolution - 3443.95
FocalPlaneYResolution - 3442.02
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Manual
WhiteBalance - Auto
SceneCaptureType - Standard

TechnoShroom

Canon EOS-30D

01/10/2005 05:18:19 PM · #3

Ok, that's one example. Perhaps too simple an example though since an EXIF editor can remove or re-edit the altered data making it appear that EXIF is original. How do you spot it then?

Canon EF 100mm f/2.8 USM Macro

01/10/2005 05:27:01 PM · #4

Having never used an EXIF editor I would not know.

D&L or the SC would be better to answer that question.
I would like to know myself.

TechnoShroom

Canon EOS-30D

01/10/2005 05:32:20 PM · #5

In previous threads they said they wouldn't say how they determine such a thing. I understand their reason but it would still be interesting to know just to satisfy my curiosity. In my limited searching on the subject I haven't found anything that tells you how to find anything more than the obvious frauds.

01/10/2005 05:45:59 PM · #6

In the original EXIF data what does the "Image Number" stand for (very bottom above my name)?

Is that somehow related to the number of images taken?

Beetle

Canon EF 24-105mm f/4.0L IS

01/10/2005 06:38:01 PM · #7

I would so love to find out the answer to this.
It's not because I want to cheat, but I am unsure about a photo (for the best of 2004)if it truly IS untouched or not, and I have no idea what to look for in the exif file.
Is RHoldenSr's example ALWAYS true? I.e. would every program (e.g. PSP) show up?

kirbic

Canon EOS R5

Canon RF 24-70mm f/2.8 L IS

01/10/2005 06:46:10 PM · #8

Originally posted by Beetle:

If you are unsure, you can ask an SC member to review it for you. If you want, you can e-mail me the original and I will take a look at it.

As TechnoShroom posted previously, if we discussed all the methods we use to review image data, it would potentially open holes for those who would cheat. I definitely understand the interest, but unfortunately we cannot discuss it.

Brock

Canon PowerShot Pro1

01/10/2005 08:09:50 PM · #9

I noticed that none of my EXIF data is kept when I save to a TIFF file for resizing. How can I resize and perform USM and have it maintain EXIF data?

kirbic

Canon EOS R5

Canon RF 24-70mm f/2.8 L IS

01/10/2005 08:10:35 PM · #10

Originally posted by Brock:

I noticed that none of my EXIF data is kept when I save to a TIFF file for resizing. How can I resize and perform USM and have it maintain EXIF data?

What software (including version) are you using?

LevT

OM System OM-1

Olympus 12-100mm f/4.0 M.Zuiko ED IS PRO

01/10/2005 09:33:31 PM · #11

Originally posted by Beetle:

I had the same problem for Best of 2004 challenge (I often do quick brightness/contrast corrections to the file in the end of shooting day and save it in the same file. Yes, I know it is a bad habit). The way I approached this problem was to check the day and time when the picture was taken (from EXIF) and the day and time when it was last modified. If these two coincide, I assume that the file was not touched.

SDW

Canon EOS-60D

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

01/10/2005 10:49:07 PM · #12

Since subject of EXIF Date came up I was just wondering what would keep a user from taking a picture from 1/1/05 to 1/15/05 but have the camera clock set for some date in 2004? Would the EXIF date state it was taken in 2004? No rules says the picture can not be edited during the submission date that I can see. A user could say they found an unedited file and edited it for this contest during the 15 day period. I don't think anyone will do this, just a question. I don't know anything about EXIF data or how it is obtained so I don't know if it is possible for someone to pull this off.

Message edited by author 2005-01-10 22:51:06.

GeneralE

Canon PowerShot S3 IS

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/10/2005 10:54:47 PM · #13

Originally posted by SDW65:

Since subject of EXIF Date came up I was just wondering what would keep a user from taking a picture from 1/1/05 to 1/15/05 but have the camera clock set for some date in 2004?

Nothing but honesty and the knowledge that we will probably ban them from the site when we catch them at it.

SDW

Canon EOS-60D

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

01/10/2005 11:20:49 PM · #14

Originally posted by GeneralE:

Originally posted by SDW65:
Since subject of EXIF Date came up I was just wondering what would keep a user from taking a picture from 1/1/05 to 1/15/05 but have the camera clock set for some date in 2004?

Nothing but honesty and the knowledge that we will probably ban them from the site when we catch them at it.

Thank you for your reply GeneralE. I was just surprised this question had not been brought up before now unless I missed it.

RayEthier

Canon EF-S 18-55mm f/3.5-5.6 USM

01/11/2005 01:17:51 AM · #15

I would like to thank all of the kind people who took the time to answer this question, and send a special thank you to Kirbic for reviewing the EXIF file on my photo.

I still feel like a complete klutz when dealing with you folks, but I can assure you that I am learning. Perhaps the greatest thrill of all is having the opportunity to view the wonderful works of the talented folks in this community.

Thanks again for everything

Ray

Brock

Canon PowerShot Pro1

01/11/2005 09:31:44 AM · #16

Originally posted by kirbic:

Originally posted by Brock:
I noticed that none of my EXIF data is kept when I save to a TIFF file for resizing. How can I resize and perform USM and have it maintain EXIF data?

What software (including version) are you using?

I am using the ZoomBrowserEX 4.0.6.2 that came with my Canon to download them from the camera flash card and convert the RAW file to TIFF. I am going to look to see if GIMP 2.2 has a RAW converter since I use GIMP for the other areas. Camera also came with ArcSoft Photostudio 5.5 for processing but only used once...as I am trying to learn GIMP.

cghubbell

Nikon D300

Nikon AF-S DX Zoom-Nikkor 17-55mm f/2.8G IF-ED

01/11/2005 09:50:53 AM · #17

Originally posted by Brock:

I am going to look to see if GIMP 2.2 has a RAW converter since I use GIMP for the other areas.

GIMP has many options for RAW conversion. Most are based on dcraw. Dcraw is a command line tool though, and not very friendly. Think of it more as what's under the hood.

For a while I used a GIMP plugin called RawPhoto. It worked fairly nicely, but I wished the preview was larger. It appears to have gone through some significant improvements since I last dabbled, so I'm sure is worth reviewing.

Another newcomer is UFRaw. I've read some impressive things about this converter, but have not played with it since I purchased Bibble Pro a while back. One of UFRaw's claims to fame is ability to read Nikon embedded tone curves. Pretty cool.

At this point, I think Bibble is the best choice for Linux users since it provides most of the basic editing functions you'd need, and does it all in a 16 bit space. GIMP is still limited to an 8 bit space, although it's a very powerful tool within that space.

Canon PowerShot Pro 90 IS

01/11/2005 01:07:38 PM · #18

Bump

Can anyone answer this?

Originally posted by RHoldenSr:

In the original EXIF data I posted above what does the "Image Number" stand for (very bottom above my name)?

Is that somehow related to the number of images taken?

coolhar

01/11/2005 03:15:17 PM · #19

What program are you using to view the EXIF data? I just looked at some files from my 20D in both EOS Viewer and IrfanView (3.92). Neither of them show an image number like the one you posted. Owner's name and camera serial number are the last two items in both, no image number that I can find.

Message edited by author 2005-01-11 15:16:52.

gloda

Canon EF 24-70mm f/2.8L USM

01/11/2005 04:26:31 PM · #20

Originally posted by RHoldenSr:

In the original EXIF data what does the "Image Number" stand for (very bottom above my name)?

Is that somehow related to the number of images taken?

Example from a Canon G2
Image Number: 1000052
This number reflects the filename: IMG_0052.jpg
I don't know what the first three digits stand for, but I found they vary among my pictures. I think it's some kind of counter which can be reset in the options menu.

Canon PowerShot Pro 90 IS

01/11/2005 11:37:12 PM · #21

I clipped the data using IrfanView V3.85

Originally posted by coolhar:

coolhar

01/12/2005 12:10:50 AM · #22

Sorry I can't help further. I think gloda may be on the right track. You need another 10D owner to compare with. You there kirbic?

Message edited by author 2005-01-12 01:42:11.

cpanaioti

Canon EOS-40D

Canon EF 70-300mm f/4.5-5.6 DO IS USM

01/12/2005 01:26:16 AM · #23

I looked at the EXIF in both the Canon software and PS CS. Nowhere is there an image number. This could be a quirk of IrfanView V3.85.

gloda