User profile for user: onthemove2000
onthemove2000 Author
User level: Level 1
12 points

Exact same photo but numbers, size, etc are different, which do I save?

Im trying to delete all my duplicate photos and videos but I've noticed with a pair of exact same photos the first says for example 1.1 MB and the second one is 1.5MB - which one do I delete?


Then on another pair of pics one is say, DSC00960.JPG 1.4 MB and the other IMG.0648 5.2MB - both are exactly the same photo so why do they have different references and such a difference in size? Again which one should I delete?


Also some pics have the photo number with upper case JPG whilst the other is lower case jpg, again exactly the same photo but why the difference? Is there even a difference


I've spent hours on and off over the last few weeks gradually going through all my photos and deleting the duplicate/triplicates but now I'm panicking that I've deleted the wrong one of hundreds of duplicate photos, to the point that I recovered a load of them just in case! Previous ones I'm afraid are gone for good.


I need to free up space so help would be really appreciated.

MacBook, OS 10.11.6 Early 2009

Posted on Aug 19, 2018 1:21 AM

Reply
Question marked as Top-ranking reply
User profile for user: léonie
léonie
User level: Level 10
200,699 points

Posted on Aug 19, 2018 6:28 AM

"DSC00960.JPG" is the filename of the image file, probably as created by the camera. Are you using a Sony camera? A Sony will create filenames starting with DSC as the camera code and a running number for successive images. After image 99999 the numbers may wrap around and the camera may use the same numbers as previously again.

1944 x 2592 1.4 MB

This line is giving you the pixel size - the width and height in pixels, and the file size. If the pixel size is the same, but two JPEGs have a different file size in MB the quality may differ because of a higher compression. Keep the image with the larger file size. If a JPEG has been highly compressed, you may be seeing plenty of artifacts and the image will have less detail.


ISO 100 29mm 0 ev f/7.1 1/400

This line is telling you how the camera has been set when you took the picture:

  • ISO 100 is the sensitivity of the sensor. With such a low value, you will have a good noise reduction, perfect for night scenes.
  • 29mm is the focal length
  • 0 ev is the exposure compensation. At 0 ev the photo is neither underexposed or over exposed.
  • f/7.1 : This is the relative aperture or focal ratio: the ratio of the focal length to the aperture of the lens.
  • 1/400: The last value is the shutter speed (exposure time in seconds).

Thes values are not important, when you try to find the file with the best image quality.

View in context

Similar questions

5 replies
Question marked as Top-ranking reply
User profile for user: léonie
léonie
User level: Level 10
200,699 points

Aug 19, 2018 6:28 AM in response to onthemove2000

"DSC00960.JPG" is the filename of the image file, probably as created by the camera. Are you using a Sony camera? A Sony will create filenames starting with DSC as the camera code and a running number for successive images. After image 99999 the numbers may wrap around and the camera may use the same numbers as previously again.

1944 x 2592 1.4 MB

This line is giving you the pixel size - the width and height in pixels, and the file size. If the pixel size is the same, but two JPEGs have a different file size in MB the quality may differ because of a higher compression. Keep the image with the larger file size. If a JPEG has been highly compressed, you may be seeing plenty of artifacts and the image will have less detail.


ISO 100 29mm 0 ev f/7.1 1/400

This line is telling you how the camera has been set when you took the picture:

  • ISO 100 is the sensitivity of the sensor. With such a low value, you will have a good noise reduction, perfect for night scenes.
  • 29mm is the focal length
  • 0 ev is the exposure compensation. At 0 ev the photo is neither underexposed or over exposed.
  • f/7.1 : This is the relative aperture or focal ratio: the ratio of the focal length to the aperture of the lens.
  • 1/400: The last value is the shutter speed (exposure time in seconds).

Thes values are not important, when you try to find the file with the best image quality.

Reply
User profile for user: léonie
léonie
User level: Level 10
200,699 points

Aug 19, 2018 2:59 AM in response to onthemove2000

DSC00960.JPG 1.4 MB and the other IMG.0648 5.2MB

Have you been using My Photo Stream to transfer photos to an iPhone or iPad?

If you save photos to a device from My Photo Stream or shared albums, the file size may be reduced and also the pixel size. Check not only the file size, but also the pixel size - the width and height in pixel and keep the photo with the larger dimensions. It will have the better resolution.

Reply
User profile for user: onthemove2000
onthemove2000 Author
User level: Level 1
12 points

Aug 19, 2018 4:50 AM in response to léonie

Really many thanks for that. I really am a complete muppet where this stuff is concerned but to answer your question, I've taken photos with my very ancient iPad then transferred them to my very ancient MacBook . . . clearly several times hence I have so many duplicates . . . and I have no idea what streaming is other than a streaming cold! Yup I'm a dinosaur. It all went terribly wrong when I upgraded my OS and it changed from iPhotos to just Photos. I think my machine just can't deal with it, any more than I can!


So what is the difference between a JPG and IMG and which of the two should I keep? Should I again go on the size? On what appear to be three identical photos this is what is on the info pop up:


DSC00960.JPG

1944 x 2592 1.4 MB


DSC00960.JPG

1944 x 2592 2.1 MB


IMG_0684.JPG

1944 x 2592 5.2 MB


I don't know what any of the following means either but all three have this:


ISO 100 29mm 0 ev f/7.1 1/400


Does any of that make any sense?


So sorry but I don't know where to go to get answers - I wish I could enrol on a course for morons but there don't appear to be any. Courses that is.

Reply

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Exact same photo but numbers, size, etc are different, which do I save?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.
Learn more Sign up