Files with very poor quality

[Cinzia3604582858vf]

Hi to everybody! 

I think I'm doing something wrong so I beg your help! 

I shoot with nikon z6II at the highest level. I impost the file in LR Classic 13.2 and then I export it in Photoshop 2024.  The  .psd file coming out from Photoshop 2024 is 458 MB.

Then I save it as .jpeg (save as) and the result is 3 MB!!!!! 

What's happening? I'm upset. I want to deliver to my costumers High definitions file but 3 MB are my my idea of HD files! 

The picture is 7087 x 4714 pixels (300 dpi).

I tried to check our all export preferences but maybe I forgot something. 

Thank you to the person who can help me! 

Cinzia 

[D Fosse]

This is normal.

Jpeg uses very aggressive compression to reduce file size for storage and transfer. But there's a price. Every time you resave a jpeg it degrades a bit, and this is irreversible.

The reason jpeg is still used, despite the drawbacks, is that the compression is incredibly effective. It can reduce size to 2-5 % of native size, with acceptable visual quality.

[Cinzia3604582858vf]

Usually my files are from 7 to 12 MB.

3 MB is really small! 

I don't understand ... 😞

[D Fosse]

Jpeg file size varies considerably with image content. Smooth flat areas compress much more effectively than busy high frequency detail. The difference can be 10 x or more.

[dj_paige]

The  .psd file coming out from Photoshop 2024 is 458 MB.

Then I save it as .jpeg (save as) and the result is 3 MB!!!!! 

Absolutely nothing wrong here. JPG is compression. It is supposed to reduce the file size without (much) noticeable loss of quality. Your assumption that file size indicates the quality of the image is completely incorrect. To judge the quality of the JPG output, you can simply look at the image (and not look at the file size).