How Image compression works on C5 ?

Hello all,
How concrete5 compresses images ? Does it compress original image or only compress thumbnails that are generated from original image.

On my C5 installation, When I upload image with 3 MB, It generates 14 thumbnails. But when I download original image it have same size. It does not compress original image.
But it seems it compresses generated thumbnails.

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MrKDilkington replied on at Permalink Best Answer Reply
Hi srjahir32,

What you describe sounds right.

In, there will be a new client side image resizing option. It allows for setting the max width, max height, and image compression quality of images before they are uploaded to the server.

This feature was added by community member mesuva.

"Client side image resize on upload, dashboard page for configuration #3193"
srjahir32 replied on at Permalink Reply
Will this update compress original image ? Or will it be same size ?
MrKDilkington replied on at Permalink Reply

I am assuming that the original local image will remain the same size.