Does ghost reduces the quality of an image after being uploaded?

Developer help
1

I am uploading images for example at 22kb and after being uploaded through the ghost admin its size is 16kb, so i am wondering if ghost “optimizes” images in some way.

Does anybody know about this?

2

Hi @lmuzquiz! Yes, Ghost optimizes images by default. You can read more about the configuration and how it works here:

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3

Thanks, i tried to find that first but could not find anything on the documentation search. I will read that. Thanks.

4

I think the 80% quality image optimization explanation is ambiguos. Clarification needs to be made. Does the image is compressed 80% (100kb x .2 = 20kb) or does the uploaded image will have 80% of the original quality? (100kb x .8 = 80kb).

Please include a detailed description of your changes and provide before/after screenshots if applicable.

Submitted a pull request

5

The image is compressed to (not by) 80% quality

JPEG quality compression and filesize do not scale linearly, which might be a cause of confusion for how much we’re compressing the images!

JPEG - Wikipedia This can give you an idea of how varied the filesize is from the compression

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6

Is there a way to deactivate this?

7

You disable image compression via your site’s configuration. See the docs: Configuration - Adapt your publication to suit your needs

In general, however, this isn’t advised as it means heavier pages and slower loading times.

8

It might employ compression techniques or resizing to make images more web friendly. The reduction in file size from 22kb to 16kb suggests some form of optimization. You can check document for more information and if you need some more information then read Image compression - Wikipedia and manually you can compress your images through online website such as https://jpegcompressor.com/.
Thank you