N900 Camera JPEG compression - Page 4 - maemo.org

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justinr	2010-07-19 , 14:08
Posts: 3 \| Thanked: 26 times \| Joined on Apr 2010	#31

Originally Posted by Bingley Joe

I don't think this tweak has any bearing on video recording whatsoever.

BUT

It's most definitely NOT working for me anymore since moving to PR1.2.. does anyone else notice this, or is it just me?

I've just tested in PR1.2 and it is working for me - have you checked that you have set 'useconfigfile=true' and rebooted?

Quote & Reply |

Bingley Joe	2010-07-19 , 15:50
Posts: 356 \| Thanked: 172 times \| Joined on Jan 2010 @ Canada	#32

Originally Posted by justinr

I've just tested in PR1.2 and it is working for me - have you checked that you have set 'useconfigfile=true' and rebooted?

I can't believe it eluded me for so long, but the problem was that the 'quality' setting was commented out like so:

Code:

[imageenc]
element=jpegenc
#quality=100

LOL

removing the # has it working again the way it used to

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Bingley Joe	2010-07-19 , 16:28
Posts: 356 \| Thanked: 172 times \| Joined on Jan 2010 @ Canada	#33

So I decided to experiment with another setting that has been commented out in the config file:

Code:

[imagepp]
#element=ipp

removing the # in front of 'element=ipp' seems to enable some form of noise reduction post-processing, as can be seen in these two screenshots taken from NeatImage:

element=ipp set to off (#)

element=ipp set to on (# removed)

Note that this is without any noise-reduction applied by NeatImage -- the screenshots simply show the plugin's analysis of the image file's noise patterns prior to creating a noise-reduction profile.

The difference is most noticeable in the chroma noise seen in the two bottom panels (Cr and Cb), but you can also see some smoothing in the Y channel.

I'm not a fan of the results, but some folks might prefer having the camera do a bit of NR on their photos.. especially if they don't have something like NeatImage to do their own NR with.

Quote & Reply |

	Flandry	2010-07-19 , 19:25
	Posts: 1,559 \| Thanked: 1,786 times \| Joined on Oct 2009 @ Boston	#34

Originally Posted by Bingley Joe

So I decided to experiment with another setting that has been commented out in the config file:
Code:
[imagepp]
#element=ipp
removing the # in front of 'element=ipp' seems to enable some form of noise reduction post-processing, as can be seen in these two screenshots taken from NeatImage:

element=ipp set to off (#)

element=ipp set to on (# removed)

Note that this is without any noise-reduction applied by NeatImage -- the screenshots simply show the plugin's analysis of the image file's noise patterns prior to creating a noise-reduction profile.

The difference is most noticeable in the chroma noise seen in the two bottom panels (Cr and Cb), but you can also see some smoothing in the Y channel.

I'm not a fan of the results, but some folks might prefer having the camera do a bit of NR on their photos.. especially if they don't have something like NeatImage to do their own NR with.

Here's information on the ipp:
http://talk.maemo.org/showpost.php?p=497095

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MAME: an arcade in your pocket
Accelemymote: make your accelerometer more joy-ful

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The Following User Says Thank You to Flandry For This Useful Post:
Bingley Joe

Bingley Joe	2010-07-19 , 20:04
Posts: 356 \| Thanked: 172 times \| Joined on Jan 2010 @ Canada	#35

Originally Posted by Flandry

Here's information on the ipp:
http://talk.maemo.org/showpost.php?p=497095

Interesting. So if I'm reading that correctly, the ipp element is just a very basic NR module that could in theory be improved upon by the community? Very interesting indeed..

I've never owned a device that made me what to learn to program as much as this one does.. nor one that made me so aware of how little time there is in a day

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Reeby	2010-08-04 , 06:44
Posts: 92 \| Thanked: 17 times \| Joined on Feb 2010	#36

Originally Posted by Bingley Joe

I've never owned a device that made me what to learn to program as much as this one does..

U could say that again! It's not like the iphone "I-tell-u-what-to-have" thing. This can be tweaked ...if you know how

Speaking of which - after playing up with config, my pictures (wide screen mode) are all now in 2560x1440 vs 2576x1448 before. And the size is on ly like 500 kb.
Strange, because I've also tried to put the "quality" up to 120, but it wouldn't change.
Anybody know the "max juice" configuration of the file?

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Bingley Joe	2010-08-06 , 16:06
Posts: 356 \| Thanked: 172 times \| Joined on Jan 2010 @ Canada	#37

Originally Posted by Reeby

Strange, because I've also tried to put the "quality" up to 120, but it wouldn't change.
Anybody know the "max juice" configuration of the file?

I'm fairly certain the 'quality' setting is a percentage (so the max would be 100 in that case).

Quote & Reply |

	ndi	2010-08-06 , 16:56
	Posts: 2,050 \| Thanked: 1,425 times \| Joined on Dec 2009 @ Bucharest	#38

JPEG supports over unity compression if you implement it in the compressor. In the JPEG Group's lib, loss of high frequency is quantified by this number but it's by no means a percentage. Plus, it's entirely in the implementation and not standard. Apple used to use 0-4.

Though I have to ask: since we have raw and JPEG in free FCamera, and the fcam suite, why is this still an issue?

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