Upload hi res images without compression

Hi

I want to add a series of images to our site so that media companies can download them for print advertisements, therefore they need to be large hi res files.

I am using the Visual Composer builder and when I add the images using the image gallery function, it compresses them.

I can see that I can change the compression for the entire site which I don’t want to do as I am happy for all other images to be compressed as they should be.

Please advise what to do in this situation, thank you