photos in laptop

Alan Ridley

Estimable
Jan 22, 2015
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Hi, my problem is that somehow I have turned all the photos(700 odd) stored in my Compaq Presario CQ58 laptop upside down+ besides doing one at a time (gulp) I am unable to correct them,any ideas please? Thanks Alan Ridley
 
You probably didn't turn them upside down. Since the advent of digital cameras, modern JPEGs also store an orientation vector in the EXIF data, which tells the photo viewing app which way is up in the photo.

More than likely, your camera's hardware writes the photo in what you would consider the upside down orientation. It then sets the orientation EXIF based on the camera's tilt switch (gravity accelerometer sensor). Something you did to the photos probably erased this orientation EXIF. Or you're using a photo viewing app which ignores the orientation EXIF.

You can use this program to change the orientation EXIF in all your photos at once.
http://savolai.net/software/JPEG-EXIF_autorotate

In the event that you need to really flip the photos 180 degrees (e.g. use them in software which ignores the orientation EXIF), you'll have to re-save the photos as new JPEGs. JPEGs are lossy, so this process usually degrades image quality. But 90- and 180-degree rotations can be done in a lossless fashion. You just need a program which knows how to do it, like this one.
http://annystudio.com/software/jpeglosslessrotator/
 
You probably didn't turn them upside down. Since the advent of digital cameras, modern JPEGs also store an orientation vector in the EXIF data, which tells the photo viewing app which way is up in the photo.

More than likely, your camera's hardware writes the photo in what you would consider the upside down orientation. It then sets the orientation EXIF based on the camera's tilt switch (gravity accelerometer sensor). Something you did to the photos probably erased this orientation EXIF. Or you're using a photo viewing app which ignores the orientation EXIF.

You can use this program to change the orientation EXIF in all your photos at once.
http://savolai.net/software/JPEG-EXIF_autorotate

In the event that you need to really flip the photos 180 degrees (e.g. use them in software which ignores the orientation EXIF), you'll have to re-save the photos as new JPEGs. JPEGs are lossy, so this process usually degrades image quality. But 90- and 180-degree rotations can be done in a lossless fashion. You just need a program which knows how to do it, like this one.
http://annystudio.com/software/jpeglosslessrotator/
 

hang-the-9

Titan
Moderator
Are you using a different program to view the files than you used to? Some programs automatically adjust the orientation, some just read the picture data. There is an article about this where someone moved pics from a MAC to a PC and they flipped. Or maybe from PC to MAC, one of those.

I don't see anyone accidentally changing the orientation of all the pictures at one time unless you wanted to edit something and applied the edit to all the files.
 
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