SX130 IS profile for DNG4PS-2

dgmarz

« on: 29 / July / 2013, 13:13:24 »

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Hi All,
i'm searching for a profile (color matrix, geometry, etc.) of SX130 IS ready to be used on DNG4PS-2 to convert RAW to DNG.

Who can kindly tell me where I can find it?

In case i want make calibration to obtain the color matrix, where / how can I find the others information needed to complete the DNG4PS-2 profile? (eg. sensor size, active zones, black-white levels, ....) ?

Thanks in advance

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philmoz

3445

Re: SX130 IS profile for DNG4PS-2

« Reply #1 on: 29 / July / 2013, 15:50:08 »

Quote from: dgmarz on 29 / July / 2013, 13:13:24

Hi All,
i'm searching for a profile (color matrix, geometry, etc.) of SX130 IS ready to be used on DNG4PS-2 to convert RAW to DNG.

Who can kindly tell me where I can find it?

In case i want make calibration to obtain the color matrix, where / how can I find the others information needed to complete the DNG4PS-2 profile? (eg. sensor size, active zones, black-white levels, ....) ?

Thanks in advance

All the information is in the source code for CHDK.
You can find the values you need in the platform_camera.h file for each camera.
For the SX130IS - http://trac.assembla.com/chdk/browser/trunk/platform/sx130is/platform_camera.h

The color matrix values need to be converted. There are 18 values in CAM_COLORMATRIX1 in the file linked to above, take each pair of numbers, and divide the first by the second to get the 9 values needed by DNG4PS-2.

Usually it's easier to just save as DNG in CHDK.

Phil.

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CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)
g5x (1.00c, 1.01a, 1.01b)
g7x2 (1.01a, 1.01b, 1.10b)

dgmarz

Re: SX130 IS profile for DNG4PS-2

« Reply #2 on: 30 / July / 2013, 04:18:34 »

Thanks Phil, always friendly and precise. Very clear explanation.
Sometimes I prefer not to save in DNG to minimize the time of saving the RAW image mainly in slow camera as SX130 IS, and also because in some night shots I used the CHDK function to average more raw together.

Thanks a lot, Ciao
Giovanni

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"According to the laws of aerodynamics, the bumblebee can't fly either,
but the bumblebee doesn't know anything about the laws of aerodynamics, so it goes ahead and flies anyway." (Igor Sikorsky)

reyalp

13880

Re: SX130 IS profile for DNG4PS-2

« Reply #3 on: 30 / July / 2013, 14:19:53 »

Quote from: dgmarz on 30 / July / 2013, 04:18:34

Sometimes I prefer not to save in DNG to minimize the time of saving the RAW image mainly in slow camera as SX130 IS, and also because in some night shots I used the CHDK function to average more raw together.

FWIW, in CHDK 1.2 DNG saving time should be very close to regular raw, and (thanks to phil) the "raw operations" are available for DNG.

CHDK 1.2 builds are available from http://mighty-hoernsche.de/trunk/ but it will be the "release" build very soon.

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dgmarz

Re: SX130 IS profile for DNG4PS-2

« Reply #4 on: 31 / July / 2013, 05:03:48 »

Thanks for clarification, reyalp.

Shoot in raw format is a very great feature. Now I'm 'using CHDK DE 1.1, but as soon as I can I would like to play with the build 1.2

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"According to the laws of aerodynamics, the bumblebee can't fly either,
but the bumblebee doesn't know anything about the laws of aerodynamics, so it goes ahead and flies anyway." (Igor Sikorsky)