QUESTION on JPG COMPRESSION ... does anyone know if this is possible with CHDK? Both the S50 and SX110 have the superfine option available in their Canon menus. Superfine JPEG results are very acceptable for much of the imaging I do. For example, 5mpx JPGs on the S50 can be as large as 4.5 MB with superfine ON. On the SX110, 9mpx JPGs can be 4.5 MB with fine and 6-7MB with superfine. Sadly and very oddly too, the S90 allows only a fine option in their menu. So 10mpx JPGs are typically a very poor 2MB on average. Being a DIGIC IV, I am guessing the option might be hidden in firmware. I don't see anything obvious in the CHDK menus, but if you know or believe superfine compression is available in Canon firmware on the S90, could there be a way to enable it via a lua command for example? Can anyone help me with this?
When I select the option, in EXIF it does show up as "Superfine," but the JPEG is still 1.6 MB @10mpx. Could there be hook that could be tried so I could test if the camera supports it? It would be great to have this option, if available.
The reason I think they do not have superfine as a choice is because this camera supports native RAWs.
So what I'm wondering is this: could superfine exist in S90 firmware nonetheless? Could the be a hook that could make the CHDK option "Image quality" work on the S90?
edit: on the S50 where I have much experience, there is a very noticeable pixel-to-pixel contrast improvement (scene fidelity) when going fine to superfine.
Considering everything, I note the top image has the more high-frequency definition in (my assumed) contrast transitions than the bottom.
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