Pentax K-5: Is it worth using the Premium JPEG quality setting?

Question

Similar: How do I choose which resolution (megapixel) and compression (normal, fine, superfine) to shoot in?

The Pentax K-5 has a JPEG quality setting called "Premium", denoted by four stars, which is not available in entry-level Pentax cameras. This setting extends beyond the "Best" (three stars) setting in my K-r which already offers very good image quality. Is there a significant advantage in using this setting, or is this not worth the larger file sizes (which can easily exceed 10 MB)? Should I choose RAW instead?

Asked by DragonLord

Answer

I default to the three-star setting (out of four), but I always use RAW + JPEG so I can revisit the choice, because there are situations where yes, it makes a difference. Particularly, when there is strong contrast across color channels, like a tree with red leaves or flowers against a blue sky, JPEG compression artifacts can be surprising visible with the three-star setting.

For most cases, you won't be able to discern a difference in double-blind testing, but in the times when it's needed, it's nice to have.

And, if I get a shot I know is a keeper, I often go back in-camera and do a careful RAW conversion, tuning the white-balance and tone curve as well as saving in the top-quality JPEG. I don't mind paying the space price for my top few images, even if the image quality difference is imperceptible. This isn't as powerful or flexible as PC-based conversion, but I can do it on the subway or whereever and then use it instantly (rather than joining the backlog of hobby to-dos). If an all-RAW workflow is more your style, that's also a totally legitimate choice, and makes this meaningless — but if your approach is more like mine, it's a nice thing.

Answered by mattdm

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