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Bug: camera over-exposes and shows red hue shift

asked 2013-12-25 19:58:48 +0200

xenoide gravatar image

updated 2013-12-25 20:05:11 +0200

In the current release of the Sailfish OS, the Jolla camera shows a clear tendency to overexpose images. Especially in low-contrast situations this is visible.

Furthermore, the images show a generally red-shifted hue, which can be seen on white surfaces very pronounced.

Both problems should be addressed in the camera firmware (or the application, depending on implementation).

Example images can be found here:

http://www.gsmarena.com/jolla_jolla-review-1025p7.php

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answered 2013-12-28 18:09:02 +0200

stezz gravatar image

With latest 1.0.2.5 update we tuned a bit the exposure / ISO tunings , especially in low lights conditions.

Still there is one issue with AWB in artificially lit environment which didn't make it on time for this release.

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How about a manual AWB (with save option) or an automatic readjust?

why: Camera lens is scratched and the IR protection film is nearly removed, so pictures have strange color shift. see: https://together.jolla.com/question/48895/camera-lens-replacement/https://together.jolla.com/question/83049/scratched-camera-lens-getting-bad-pictures-how-to-fix-it/

torti17 ( 2015-06-22 15:03:08 +0200 )edit
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answered 2013-12-25 22:27:55 +0200

xenoide gravatar image

updated 2013-12-25 22:29:10 +0200

I agree that AWB sometimes is less than perfect. However in most cases, it is the only option that makes any sense on mobile cameras as the WB presets are usually not recocmmended for most of the situations.

Any by the way, the hereby described issue is most likely not due to bad AWB calibration, it seems to be an issue of the internal RAW->JPEG converter inside the camera module or in the post-processing algorithm.

The same applies to the unfortunate exposure which seems a bit to high (let's say around +1/3 EV)

This is quite a pity as the Jolla camera seems to capture quite a lot detail and renders nicely sharp images (at least under good lighting).

Those issues can be fixed by software and that would be just a nice fix as this could improve the overall quality of the photos quite a lot.

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answered 2013-12-25 22:04:07 +0200

pnuu gravatar image

The AWB algorithms are never perfect (happens with > 1000 eur semi-pro DSLRs, too). In some cases the pre-set white balances (cloudy, sunny, fluorecent, tungsten) produce much better results in respective light-conditions.

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Asked: 2013-12-25 19:58:48 +0200

Seen: 188 times

Last updated: Dec 28 '13