Title: Gallery image
Last modified: April 6, 2020

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# Gallery image

 *  Resolved [artshinobi2323](https://wordpress.org/support/users/artshinobi2323/)
 * (@artshinobi2323)
 * [6 years, 2 months ago](https://wordpress.org/support/topic/gallery-image-6/)
 * Hi! I just want to ask about the files that being compiled inside the wp-content/
   gallery/..
 * The image were duplicated into different sizes. and another group of images are
   duplicate as back-up, my question for this is:
 * 1) what is the purpose of those back-up images?
 * 2) When I change the extension of back-up images to .jpg, which half the size
   of the original file, it can be open and same quality of the original file.
    
   Is there’s a way that the original images be replaced by this back-up files since
   the size of this are optimized?

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [Mihai Ceban](https://wordpress.org/support/users/mihaiimagely/)
 * (@mihaiimagely)
 * [6 years, 2 months ago](https://wordpress.org/support/topic/gallery-image-6/#post-12634698)
 * Hi [@artshinobi2323](https://wordpress.org/support/users/artshinobi2323/),
 * NextGen will create different image crops for each uploaded image at the size
   specified in “Gallery -> Other Options -> Image Options -> What should images
   be resized to?” to use that image as lightbox image. Also, it will create at 
   least one thumbnail image for each uploaded images.
 * 1) The purpose of the backup images ( you can disable the backup images from “
   Gallery -> Other Options -> Image Options -> Backup the original images?” ) is
   to offer you a roll-back option via “Gallery -> Manage Galleries -> Bulk Options”
   after editing or watermarking your images;
 * 2) The images that are stored with _backup extensions are the original images.
   You can control the quality and resolution of the generated by NextGen images
   from “Gallery -> Other Options -> Image Options”;
 *  [gabyimagely](https://wordpress.org/support/users/gabyimagely/)
 * (@gabyimagely)
 * [6 years ago](https://wordpress.org/support/topic/gallery-image-6/#post-12870816)
 * Because it has been a month or more since your last reply, I am going to mark
   this as resolved as I assume you have found a solution. Please feel free to reply
   again if you still have questions.
 * Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Gallery image’ is closed to new replies.

 * ![](https://ps.w.org/nextgen-gallery/assets/icon-256x256.png?rev=2083961)
 * [Photo Gallery, Sliders, Proofing and Themes - NextGEN Gallery](https://wordpress.org/plugins/nextgen-gallery/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/nextgen-gallery/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/nextgen-gallery/)
 * [Active Topics](https://wordpress.org/support/plugin/nextgen-gallery/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/nextgen-gallery/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/nextgen-gallery/reviews/)

## Tags

 * [nextgen](https://wordpress.org/support/topic-tag/nextgen/)

 * 2 replies
 * 3 participants
 * Last reply from: [gabyimagely](https://wordpress.org/support/users/gabyimagely/)
 * Last activity: [6 years ago](https://wordpress.org/support/topic/gallery-image-6/#post-12870816)
 * Status: resolved