“The Lightroom default JPEG export quality of 75, falling in the 70〜76 range, seems to provide for as good a visible result as the highest quality setting for all the samples except for the bridge, which seems to suffer at least slight posterization banding at all levels, including even “lossless TIFF”. The file size, even at this relatively high 70〜76 setting, is still about a third less than at the 93〜100 setting, so is well worth it in most situations. Those who blindly use the maximum setting for their exports likely waste a lot of local disk space, upload bandwidth, and remote storage space. But conversely, those who blindly use some lesser setting risk posterization in the occasional photo with an unlucky sky gradient.”
