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CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit

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Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #30 on: 14 / January / 2009, 15:30:50 »
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Problems I still have at the moment:

- Sometimes the RAW buffer is not dumped correctly, presumably the RAW buffer is changing address sometimes like in the g7/g8/g9 cams. This normally shows when doing multiple pics in continuous mode or scripts that shoot more than one picture (like the bad pixel detection script).
- Dead pixel detection doesn't work by just checking for a 0 value, I have dead pixels in the range 0-0x10 (in 12 bit resolution)
- Haven't looked at video recording at all yet
- In 80 ISO mode, the RAW data is broken, although this may be the same as the first problem.

I have had a little more luck in getting more image detail in the lower 4 bits by using the lowest-noise modes possible: a 100 ISO, well-lit scene produces some data in the lower 4 bits.

Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #31 on: 14 / January / 2009, 16:01:34 »
Interesting pattern.  I wouldn't expect that to be useful data, just noise from the lens. 
Having issues setting up the dev tools.  Stupid network.  Hopefully i'll get them installed to help the cause soon.

great work dood
-M

Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #32 on: 15 / January / 2009, 02:40:50 »
I had a discussion with some people and we concluded that the pattern could be real data; if you make a gradient and add gaussian noise, then take only the low X bits, you should get a pattern resembling this. It is just a 'softened' sawtooth - a sawtooth is what you'd get if you had 0 noise.

Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #33 on: 15 / January / 2009, 13:36:14 »
and in english..?  lol


Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #34 on: 16 / January / 2009, 02:39:51 »
I will be looking at fixing the sometimes-broken RAW support this weekend, so watch this space :)

Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #35 on: 16 / January / 2009, 14:31:02 »
Watching with bated breath!!!

Good luck!

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Offline kayec

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Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #36 on: 16 / January / 2009, 15:40:19 »
I just got my camera back and want to try this.  Is there a way to connect the SD770 as a removable drive?  It connects to Ubuntu and Windows though FSpot or Explorer but i can only take photos off, not put files on.  Do i need to go get a card reader?

Thanks!!!

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Offline reyalp

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Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #37 on: 16 / January / 2009, 17:14:10 »
I just got my camera back and want to try this.  Is there a way to connect the SD770 as a removable drive?  It connects to Ubuntu and Windows though FSpot or Explorer but i can only take photos off, not put files on.  Do i need to go get a card reader?
You will need to get a card reader, no way to make the card bootable otherwise.
Don't forget what the H stands for.


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Offline kayec

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Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #38 on: 16 / January / 2009, 19:31:44 »
Ok thanks!  I'll pick up one tonight.

Re: CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit
« Reply #39 on: 17 / January / 2009, 08:26:46 »
Well here it is.

- Fixed RAW
- Fixed dead pixel detection (had some bits the wrong way around again)
- Fixed DNG
- Fixed 80-ISO

I removed the loader blink so that's faster too now.

Only things left are movie recording as far as I know ..

 

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