I think that you are mistaken.
Yes, PNG is lossless format, but it is not meant for photos in any way! PNG has features like fading and transparency which photos don’t need and also has limits on size of color palette which makes photos look weird.
JPG (JPEG) format is greatly optimized for camera photography. It was inspired how human eye functions and the loss is there for the good and is practically unnoticable (when using quality level 75-80 that I recommended)
Whatever you do, just don’t use PNG for photos, the resulting file would be much bigger than same JPEG.
