PowerShot SX230 HS - Porting Thread - page 29 - General Discussion and Assistance - CHDK Forum

PowerShot SX230 HS - Porting Thread

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Re: PowerShot SX230 HS - Porting Thread
« Reply #280 on: 02 / September / 2011, 00:07:23 »
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RAW capture is really strange... The regular JPG image is fine, but when I open the DNG file, I can see the edges of the lens in the corners. Example of what I'm talking about:

JPG: http://i162.photobucket.com/albums/t245/BWL_AK_BLAZER/Misc/IMG_0426s.jpg

RAW: http://i162.photobucket.com/albums/t245/BWL_AK_BLAZER/Misc/CRW_0426.jpg

If you open the two images in tabs and switch between the two, you can see the two images are completely different! What's going on here?
« Last Edit: 02 / September / 2011, 00:12:25 by AK49BWL »
Canon SD770IS GM1.00A
Canon SX20IS GM1.02B
Canon SX230HS GM1.00C (RIP :()
Canon SX130IS GM1.00B

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Offline philmoz

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Re: PowerShot SX230 HS - Porting Thread
« Reply #281 on: 02 / September / 2011, 00:13:26 »
RAW capture is really strange... The regular JPG image is fine, but when I open the DNG file, I can see the edges of the lens in the corners. Example of what I'm talking about:

JPG: http://i162.photobucket.com/albums/t245/BWL_AK_BLAZER/Misc/IMG_0426s.jpg

RAW: http://i162.photobucket.com/albums/t245/BWL_AK_BLAZER/Misc/CRW_0426.jpg

What's going on here?

That's normal for current cameras.
With the processing power available in the camera it's cheaper to do software distortion correction than to build a distortion free lens.
The raw file is showing the actual captured image - the camera jpeg has been corrected and cropped in the camera to remove the distortion.

Phil.
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)

Re: PowerShot SX230 HS - Porting Thread
« Reply #282 on: 02 / September / 2011, 00:17:29 »
Makes me wonder what's the point of me having RAW capture on this camera now... I don't have the know-how to fix the images. Seems rather cheap of Canon to have done that...
Canon SD770IS GM1.00A
Canon SX20IS GM1.02B
Canon SX230HS GM1.00C (RIP :()
Canon SX130IS GM1.00B

Re: PowerShot SX230 HS - Porting Thread
« Reply #283 on: 02 / September / 2011, 00:20:55 »
Makes me wonder what's the point of me having RAW capture on this camera now... I don't have the know-how to fix the images. Seems rather cheap of Canon to have done that...

Ah - the subject of so many flame wars on this forum.   Use the search function and ask for "RAW".   Lots of stuff to learn, good and bad.  Many of the more accomplished member of this forum produce amazing images from cheap Canon P&S cameras using CHDK raw and a few free image processing tools.
Ported :   A1200    SD940   G10    Powershot N    G16


Re: PowerShot SX230 HS - Porting Thread
« Reply #284 on: 02 / September / 2011, 00:31:36 »
Makes me wonder what's the point of me having RAW capture on this camera now... I don't have the know-how to fix the images. Seems rather cheap of Canon to have done that...

Canon is one of the last companies to adopt this "cheap" way, as you call it. Blame the competition, especially Panasonic for starting this. I do not think this is the right thread to complain.

To answer your dilemma about the use of RAW files, if you search this thread someone posted a great lens profile for this camera (thanks, btw!) which is very helpful in correcting the images in one step if you are using Photoshop or Lightroom.

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Offline philmoz

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Re: PowerShot SX230 HS - Porting Thread
« Reply #285 on: 02 / September / 2011, 00:37:06 »
Makes me wonder what's the point of me having RAW capture on this camera now... I don't have the know-how to fix the images. Seems rather cheap of Canon to have done that...

Not just Canon, I think you'll find all the manufacturers are doing this now.
With Canon/CHDK at least you have the option to get the RAW data and process it how you want to - not just how the camera does it internally.

The distortion quickly reduces as you zoom in and is barely noticeable at medium to long focal lengths.
It's pretty easy to fix depending on what software you have.
For example Abode make a free lens profile creation tool that can be used with Lightroom and Photoshop.
You can fairly quickly create a profile for the camera and Lightroom and Photshop will then automatically apply the correction.
From memory there is a lens profile available on the forum for either the SX230 or SX220 (which has the same lens).

Phil.
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)

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Offline Peter_A720

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Re: PowerShot SX230 HS - Porting Thread
« Reply #286 on: 02 / September / 2011, 03:23:04 »
I have noticed that a RAW file  has 12,3M-Pixel and cropped JPG-file with 12M-Pixel is calculated only from about 8M-Pixel with focal length 5mm :o


RAW capture is really strange... The regular JPG image is fine, but when I open the DNG file, I can see the edges of the lens in the corners. Example of what I'm talking about:

JPG: http://i162.photobucket.com/albums/t245/BWL_AK_BLAZER/Misc/IMG_0426s.jpg

RAW: http://i162.photobucket.com/albums/t245/BWL_AK_BLAZER/Misc/CRW_0426.jpg

What's going on here?

That's normal for current cameras.
With the processing power available in the camera it's cheaper to do software distortion correction than to build a distortion free lens.
The raw file is showing the actual captured image - the camera jpeg has been corrected and cropped in the camera to remove the distortion.

Phil.

« Last Edit: 02 / September / 2011, 05:01:46 by Peter_A720 »
Cameras:
A720 IS Fw.: 1.00c
SX230 HS Fw.: 1.01a
S100 Fw.: 1.02a
SX270 HS Fw.: 1.02c
A4000 IS Fw.: 1.01a
Ixus 230 HS Fw.: 1.00a
G7x Mark II

Greetings from Germany

Re: PowerShot SX230 HS - Porting Thread
« Reply #287 on: 02 / September / 2011, 05:58:05 »
Hiya,

I finally got a free evening to look at the ISO400 bug. I think I managed to crack it, not sure what else I have broken in the meantime ( I kind of wish I have made a backup copy of the source at Beta04, as I cant remember what changes I have made since then )

Sorry for taking so long I have been quite busy and I was origionally only going to spend a four day weekend on this project..

As always use at your own risk
CHDK sx230 firmware version 1.01A
Diskboot.bin   -   http://www.box.net/shared/upb0772a7o5evde4cghx
PS.FI2   -  http://www.box.net/shared/dms1thh7r325pry8d8fo

Is it me or on this version the keyboard feel a lot less responsive?

I would offer to help with the 1.01B but am too busy. If anyone wants any pointers feel free to PM me.

Let me know how it fares,

Taliesin


Re: PowerShot SX230 HS - Porting Thread
« Reply #288 on: 02 / September / 2011, 12:22:09 »
Hi Taliesin! You've done a great work! thumbs up for you! I can't wait to see a 1.01B firmware working! :'D

Re: PowerShot SX230 HS - Porting Thread
« Reply #289 on: 02 / September / 2011, 12:57:49 »
Hiya,

I finally got a free evening to look at the ISO400 bug. I think I managed to crack it, not sure what else I have broken in the meantime ( I kind of wish I have made a backup copy of the source at Beta04, as I cant remember what changes I have made since then )

Sorry for taking so long I have been quite busy and I was origionally only going to spend a four day weekend on this project..

As always use at your own risk
CHDK sx230 firmware version 1.01A
Diskboot.bin   -   http://www.box.net/shared/upb0772a7o5evde4cghx
PS.FI2   -  http://www.box.net/shared/dms1thh7r325pry8d8fo

Is it me or on this version the keyboard feel a lot less responsive?

I would offer to help with the 1.01B but am too busy. If anyone wants any pointers feel free to PM me.

Let me know how it fares,

Taliesin

Hi taliesin and thanks for your work.
Have you looked into the .jpg compression bug yet?
I've been mostly using chdk for bracketing photos and no matter which quality settings i choose, the file comes out rathers small in filesize.
For eg. same pic without chdk is around 5MB and with chdk its 2.5MB, so the quality is a bit low. Compression seems to be normal or below always.

Cheers.

 

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