How to edit EXIF data with Exif Pilots
in questions and answers

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1. Am I degrading the jpeg each time I edit and save using Exif Pilot?

2. Will the "add to current time" option change only the time regardless of the date, or will it realize the transition past 12:00 midnight and also change the date?

3. When I type "exifpilotpro.exe c:\Pictures Exif/Photo/FNumber 48/10" on the command line, the EXIF data changes successfully. However, the Exif Pilot window doesn't open. Why not?

4. May I change one tag in the several images at the same time using Exif Pilot Pro?

5. How may I edit the F Number and Focal Length?

6. Please explain how "Date-Time" is different from "Date Original" and "Date Digitized".

1. [ Exif Pilot, Exif Pilot Pro ]

   Am I degrading the jpeg each time I edit and save using Exif Pilot?

   No, jpeg images are not degraded after editing and saving EXIF info with Exif Pilot.

    

2. [ Exif Pilot, Exif Pilot Pro ]

   Will the "add to current time" option change only the time regardless of the date, or will it realize the transition past 12:00 midnight and also change the date?

   The program will realize the transition past 12:00 midnight and also change the date.

    

3. [ Exif Pilot Pro ]

   When I type "exifpilotpro.exe c:\Pictures Exif/Photo/FNumber 48/10" on the command line, the EXIF data changes successfully. However, the Exif Pilot window doesn't open. Why not?

   The Exif Pilot Pro window will open, if you type only "exifpilotpro.exe" on the command line.
   Your example shows an advantage of using the command line. You can change tags in the images without opening the program.

    

4. [ Exif Pilot Pro ]

   May I change one tag in the several images at the same time using Exif Pilot Pro?

   a) If all the tags in all the images that you want to change are the same, then you may change them all at the same time using the "Edit EXIF Data" option.
   b) If some tags are the same but others are different, you must first remove those that are different. Export a file to MS Excel, delete all tags except the tag(s) which you need to change. Then choose the appropriate files in Exif Pilot Pro and import the changed file(s) from MS Excel and change the tags in all the files.

    

5. [ Exif Pilot, Exif Pilot Pro ]

   How may I edit the F Number and Focal Length?

   The F Number and Focal Length tags are defined with the fractional type. Fractional type tags can contain only fractional numbers in the form a/b, so the parameter value must be in a/b format.
   If you want to set a new value of 4.8, you need to convert it from decimal format. For example, 4.8 = 48/10 or 0.3 = 3/10.

    

6. [ Exif Pilot, Exif Pilot Pro, Exif Farm ]

   Please explain how "Date-Time" is different from "Date Original" and "Date Digitized".

   There are three EXIF date fields: "Date Time", "Date Time Original" and "Date Time Digitized"
   
   a) DateTime
   The date and time of image creation. In Exif standard, it is the date and time the file was changed.
   
   b) DateTimeOriginal
   The date and time when the original image data was generated. For a digital still camera the date and time the picture was taken are recorded.
   The DateTimeOriginal tag is used by digital cameras when processing an image. First the image is created at DateTime. Next the image is prepared for recording on a memory stick at DateTimeOriginal.
   
   c) DateTimeDigitized
   Date and time when the image was stored as digital data. If, for example, an image was captured by DSC and at the same time the file was recorded, then DateTimeOriginal and DateTimeDigitized will have the same contents.
   DateTimeDigitized is not the date of image digitization after scanning the negatives or print. This tag is used by digital cameras which change it automatically after photographing.

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