EXIF/IPTC data in images

EXIF/IPTC data in images

PostBy: Richard S. On: Sun Nov 23, 2008 1:24 pm

I've seen some posts on here that have the images imprinted with the date/time etc. You do not have to do this to maintain this information and since it's screwing the image data up you shouldn't. Cameras will place this information directly into the file. This can be accessed with most image editors. As example we'll take this image recently posted:

Image

Now if we open this image with irfanview then click image > information > EXIF Info .... We'll be presented with the following information:


Make - EASTMAN KODAK COMPANY
Model - KODAK Z650 ZOOM DIGITAL CAMERA
Orientation - Top left
XResolution - 230
YResolution - 230
ResolutionUnit - Inch
YCbCrPositioning - Centered
ExifOffset - 504
ExposureTime - 1/80 seconds
FNumber - 3.20
ExposureProgram - Action program
ISOSpeedRatings - 160
ExifVersion - 0221
DateTimeOriginal - 2008:11:23 11:24:22
DateTimeDigitized - 2008:11:23 11:24:22
ComponentsConfiguration - YCbCr
ShutterSpeedValue - 1/79 seconds
ApertureValue - F 3.25
ExposureBiasValue - 0.00
MaxApertureValue - F 3.25
MeteringMode - Multi-segment
LightSource - Auto
Flash - Flash fired, auto mode
FocalLength - 12.40 mm
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 2048
ExifImageHeight - 1536
InteroperabilityOffset - 8718
ExposureIndex - 160
SensingMethod - One-chip color area sensor
FileSource - Other
SceneType - Other
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
DigitalZoomRatio - 0.00 x
FocalLengthIn35mmFilm - 75 mm
SceneCaptureType - Standard
GainControl - Low gain up
Contrast - Normal
Saturation - Normal
Sharpness - Normal
SubjectDistanceRange - Unknown

Maker Note (Vendor): -

Thumbnail: -
Compression - 6 (JPG)
Orientation - Top left
XResolution - 72
YResolution - 72
ResolutionUnit - Inch
JpegIFOffset - 9022
JpegIFByteCount - 4670




As you can see there is huge amount of information here including the date and time the image was taken, assuming the date and time on the camera is accurate so will this information. Any of this information can be imprinted on copies of the images using the batch conversion utility in Irfanview.

One thing to note that some image editors will dicard this information either because they do not support it or on purpose. For example when you "save for the web" in most image editors this info is removed to make the filesize smaller.


It doesn't stop there though because this is just technical information, you can add other information like who took the picture, who's in the picture or really anything you want using the IPTC data and even better yet you ca do this in batch mode, for example if you have bunch of pictures from one event you can add the information to all of them at once.

Open irfanview, click File > Thumbnails to popen the thumbnails organizer.

Navigate to the folder with the imges you want to add the information too. Highlight every file you want to add the information too. Then in the thumbnails pane click File > JPG lossless Operations > Set IPTC data to selected files .........Add the information you want then click write. This will write the data to all selected files

Be sure to test these operations on copies of your files first to insure you are screwing anything up and understand what you are doing. In addition there is another program that performs similar operations called Exifer.
Richard S.
 
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite

Re: EXIF/IPTC data in images

PostBy: av8r On: Sun Nov 23, 2008 1:58 pm

*Some*, not all cameras imprint metadata on the files. Users should confirm this if they wish to use that information. Using a tool like Lightroom allows you to "paint" on any metadata you choose which then allows you to search your images for the ones you want. Very handy.
av8r
 
Hot Air Coal Stoker Furnace: Leisure Line Hearth with twin turbos (sounds like it)
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Hearth model with twin turbos

Re: EXIF/IPTC data in images

PostBy: Richard S. On: Sun Nov 23, 2008 2:41 pm

av8r wrote:Using a tool like Lightroom allows you to "paint" on any metadata you choose which then allows you to search your images for the ones you want


If you mean add the text as viewable like the example image I posted both irfanview and Exifer can do that in batch conversion mode. This is why you shouldn't have the camera do it. You can always make copies with that information if you want it on there.
Richard S.
 
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite


Re: EXIF/IPTC data in images

PostBy: av8r On: Sun Nov 23, 2008 6:56 pm

Yep...there are lots of tools that will do this. I stopped using the others in favor of a work flow based tool (Lightroom). It's much easier to have the tool assist you in the actual work flow process, especially the cataloging and storage of the images. Lightroom also does non-destructive editing so the original image is never touched. The changes you made are held in a database and layered to show you what you did to the image, but never applied to the original. Very slick piece of software.
av8r
 
Hot Air Coal Stoker Furnace: Leisure Line Hearth with twin turbos (sounds like it)
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Hearth model with twin turbos