Print Page - Filsize reduced by 20 Kb after Orientation change

Title: Filsize reduced by 20 Kb after Orientation change
Post by: alpha-nbg on April 10, 2011, 11:01:35 AM

Hello,

if i try to change the Orientation of a jpg it works correct.


exiftool -Orientation -S P4070201.JPG
Orientation: Horizontal (normal)

exiftool -Orientation=8 -n P4070201.JPG
    1 image files updated

exiftool -Orientation -S P4070201.JPG
Orientation: Rotate 270 CW

But what makes me wonder is, the filesize is reduced by 20 kb after this operation.
original: 6.442 KB
after rotation: 6.423 KB
How can that be? It should be changed only a little header information.

regards,
Armin.

Title: Re: Filsize reduced by 20 Kb after Orientation change
Post by: Phil Harvey on April 10, 2011, 11:12:37 AM

Hi Armin,

This is FAQ number 13 (https://exiftool.org/faq.html#Q13).

- Phil

Title: Re: Filsize reduced by 20 Kb after Orientation change
Post by: alpha-nbg on April 10, 2011, 01:44:38 PM

Hello Phil,

Thank you very much for this information.
Now I understand it.

regards,
Armin

ExifTool Forum

ExifTool => The "exiftool" Application => Topic started by: alpha-nbg on April 10, 2011, 11:01:35 AM