ExifTool Forum

Hi,

i thought i make a new topic regarding my new questions. Hope its ok.

I saw some thumbnail data on some images,

how exactly do i only view the thumbnail, not the entire image? (in my mind thumbnail means its a small preview of the picture, right?)
and with what command do i delete thumbnails from images?


also i wondered how i generate random imageuniqueid if they not exist PER image if i process multiple images at once?
i found this thread, however the solutions provided are either for linux or for specific images:
https://exiftool.org/forum/index.php?topic=6659.15

But i want to use it with *.jpg but it shall still assign some random imageuniqueid to each seperate image


also i meant to ask if exfitool actively writes this tag to the images:
[ExifTool]      ExifToolVersion                 : 12.18
[ExifTool]      Warning                         : Invalid EXIF text encoding for UserComment
and if i can prevent it from doing so, and how to delete the tag if its already written.

how do i drop "adobe" tags?


thanks so much. great help here!

Quote from: datetime on February 21, 2021, 02:52:40 AM
how exactly do i only view the thumbnail

You can extract it (if it exists) with this command:

exiftool -thumbnailimage -b -w _thumb.jpg DIR

Quoteand with what command do i delete thumbnails from images?

exiftool -thumbnailimage= DIR

also i wondered how i generate random imageuniqueid if they not exist PER image if i process multiple images at once?

See the NewGUID tag in the Extra Tags (https://exiftool.org/TagNames/Extra.html).

Quotealso i meant to ask if exfitool actively writes this tag to the images:
[ExifTool]      ExifToolVersion                 : 12.18
[ExifTool]      Warning                         : Invalid EXIF text encoding for UserComment
and if i can prevent it from doing so, and how to delete the tag if its already written.

I don't know what you are asking.  Do you mean write ImageUniqueID to a file with a warning about UserComment?  The answer is yes.  Can you prevent it from writing to a file which has this warning?  Not easily.

Quotehow do i drop "adobe" tags?

exiftool -adobe:all= FILE

- Phil

Thanks so much Phil i appreciate your help as i understand it would be somehow possible to find the answers to my questions the hard way looking more hours into all the info already provided!

By my question regarding exiftool:
[ExifTool]      ExifToolVersion                 : 12.18
[ExifTool]      Warning                         : Invalid EXIF text encoding for UserComment

i meant if exiftool writes this "exiftool" tags directly into the file and if they are readable by other programs and if i can prevent those tags.

Those tags are not part of the file.  Similarly, any tag that is part of the Composite group are not embedded in the file. 

Exiftool will write to XMP-x:XMPToolkit with a value like Image::ExifTool 12.18 if any xmp tags are written.