A
Anonymous
Guest
various EXIF information.....
#1. Data is automatically imbedded into the file when saved in the camera. The
data includes the time and date the picture was taken, but also all
information on the f-stop used, program mode chosen, shutter speed, flash
utilization and virtually everything except for the temperature! If you
choose to keep the information after downloading to your computer, you must
ensure that the original is kept (on hard drive or CDR) if you save the
jpg file as something else, you lose the exif information. You can RENAME
the file, but opening it and saving or modifying it in any way will lose the
info.Some people use Photoshop to edit and crop files, always save as the PSD photoshop
native format, which keeps the original jpg file untouched.
#2 EXchangeable Image file Format
First let me assure you that you can edit your files with whatever JPEG compatible program you choose without ever worrying about EXIF data. You may not even care abou this data and so its loss wouldn't matter. However let me explain briefly what it is and then you can decide if you want to fool with it.
EXIF stands for "EXchangeable Image file Format". It is a standard issued by JEIDA (Japan Electronic Industry Development Association) as a file format for Digital Still cameras to store image and audio information. EXIF formats include information ABOUT the image (and audio), IN ADDITION to the image itself. The standard has some very ambitious goals (hence the EXchangeability), However, I'll just provide a simplified glimpse of it and then links for those who wish to explore it further.
EXIF formats come in different flavors (JPEG, TIFF etc.) that are transparent to applications that aren't EXIF aware. In other words an EXIF JPEG can be viewed (and edited) by any JPEG editor. The only consequence is that the additional EXIF information will be lost.
So what IS this extra information? Well the exact date and time the image was taken, for starters. In addition, it stores HOW the image was taken (the shutter speed, the F-Number, the exposure program used, focal length, whether or not a flash was used, etc.). Much of this information can be seen by opening the image in MGI PhotoSuite and selecting "Image Information" under the Image menu. I like to use this information because it helps me learn to take better pictures. I can compare the setup I used with the results achieved--it's a wonderful feedback loop. Finally information that ties associated audio files is also stored--but a "slide show" program needs to be aware of this info to use it.
Again let me emphasize that you can choose not to worry about any of this stuff. Just shoot and enjoy your pictures! If knowing the focal length of your image isn't important to you, then don't worry about it.
3. EXIF Image Format white paper - specifications
http://www.pima.net/standards/it10/PIMA15740/exif.htm
4. Other s/w can be used to find the EXIF info also:
http://www.takenet.or.jp/~ryuuji/minisoft/exifread/english/
#1. Data is automatically imbedded into the file when saved in the camera. The
data includes the time and date the picture was taken, but also all
information on the f-stop used, program mode chosen, shutter speed, flash
utilization and virtually everything except for the temperature! If you
choose to keep the information after downloading to your computer, you must
ensure that the original is kept (on hard drive or CDR) if you save the
jpg file as something else, you lose the exif information. You can RENAME
the file, but opening it and saving or modifying it in any way will lose the
info.Some people use Photoshop to edit and crop files, always save as the PSD photoshop
native format, which keeps the original jpg file untouched.
#2 EXchangeable Image file Format
First let me assure you that you can edit your files with whatever JPEG compatible program you choose without ever worrying about EXIF data. You may not even care abou this data and so its loss wouldn't matter. However let me explain briefly what it is and then you can decide if you want to fool with it.
EXIF stands for "EXchangeable Image file Format". It is a standard issued by JEIDA (Japan Electronic Industry Development Association) as a file format for Digital Still cameras to store image and audio information. EXIF formats include information ABOUT the image (and audio), IN ADDITION to the image itself. The standard has some very ambitious goals (hence the EXchangeability), However, I'll just provide a simplified glimpse of it and then links for those who wish to explore it further.
EXIF formats come in different flavors (JPEG, TIFF etc.) that are transparent to applications that aren't EXIF aware. In other words an EXIF JPEG can be viewed (and edited) by any JPEG editor. The only consequence is that the additional EXIF information will be lost.
So what IS this extra information? Well the exact date and time the image was taken, for starters. In addition, it stores HOW the image was taken (the shutter speed, the F-Number, the exposure program used, focal length, whether or not a flash was used, etc.). Much of this information can be seen by opening the image in MGI PhotoSuite and selecting "Image Information" under the Image menu. I like to use this information because it helps me learn to take better pictures. I can compare the setup I used with the results achieved--it's a wonderful feedback loop. Finally information that ties associated audio files is also stored--but a "slide show" program needs to be aware of this info to use it.
Again let me emphasize that you can choose not to worry about any of this stuff. Just shoot and enjoy your pictures! If knowing the focal length of your image isn't important to you, then don't worry about it.
3. EXIF Image Format white paper - specifications
http://www.pima.net/standards/it10/PIMA15740/exif.htm
4. Other s/w can be used to find the EXIF info also:
http://www.takenet.or.jp/~ryuuji/minisoft/exifread/english/