I'm having exactly the same problems with my Canon G1X & long exposure RAW images. This only occurs with Apple products - Core Image - Colorsysnc - Preview - Aperture. When using Canon's Digital Photo Professional or ImageBrowser there are no problems with the color cast on RAW images. I have seen this topic elsewhere & the general consensus is that is is an Apple problem.
I'm running :
OS X 10.7.5 - 21.5 in 2.5 Ghz & a AMD Radeon HD 6750M
All software updates are implemented.
RAW files of short exposure are ok only the long exposure images are a problem. Tried out all suggested corrections - Aperture repair data base - Aperture restore ..... etc. Run Onyx to reset user apps - run colorsync to verify colors ......
No I think this is a genuine Apple problem but its going to take a while for them to fix it. I hvae a suspicion that they have not adapted their software to the AMD graphics card as I have problems using Core Image fun house.
One other thing I used the Previe 5.5.3 - Tools - Assign Profile but it does not assign to the new selected profile even though the file is editable. The soft proof profile does work but none of the selected profiles corrects the green image problem.
Should I find some resolution on this I'll let you know
There have been two previous threads on poor results for raw developement with images with difficult lighting situations: In these cases the images have been taken in artificial light, and the resolution of the details in the background was very poor and the colors were wrong, see:
Keith, thank you for the input. I generally shoot in Manual mode only & any highlight optimisation is turned off. I see from the manual it is possible to adjust images on the camera so I might try that & see if it has any effect.
Could be that Canon DPP app handles the long exposure by using the ITU-R BT.709 conversion.
I ran a scan for ITU-R BT.709 in the /Applications dir & it showed up in /Canon Utilities/Canon MOV Encoder/ …….
also in /System dir
I think a simple short cut to resolving how Apple handles sYCC CR2 information is for someone to try out Final Cut Pro X & see if the problem occurs there.
The following makes interesting reading :
Canon CR2 specs
Canon CR2 files sYCC
ITU-R BT.709 conversion
A different form of Y′CbCr is specified in the ITU-R BT.709 standard, primarily for HDTV use. The newer form is also used in some computer-display oriented applications. In this case, the values of Kb and Kr differ, but the formulas for using them are the same. For ITU-R BT.709, the constants are:
Kb = 0.0722
Kr = 0.2126
Out of interest here's the Exif
Aperture Value: 5.312
Color Space: sRGB
Components Configuration: 1, 2, 3, 0
Compressed Bits Per Pixel: 3
Custom Rendered: Normal process
Date Time Digitized: 2013:03:05 03:35:40
Date Time Original: 2013:03:05 03:35:40
Digital Zoom Ratio: 1
Exif Version: 2.3
Exposure Bias Value: 0
Exposure Mode: Manual exposure
Exposure Program: Manual
Exposure Time: 40
File Source: DSC
Flash: Flash did not fire, compulsory flash mode
FlashPix Version: 1.0
Focal Length: 17.505
Focal Plane Resolution Unit: inches
Focal Plane X Resolution: 5,905.021
Focal Plane Y Resolution: 5,902.351
ISO Speed Ratings: 800
Max Aperture Value: 3.625
Metering Mode: Pattern
Pixel X Dimension: 4,352
Pixel Y Dimension: 3,264
Scene Capture Type: Standard
Sensing Method: One-chip color area sensor
Shutter Speed Value: -5.312
White Balance: Auto white balance
AFInfo: 0.4100414, 0.4096201, 0.1799173, 0.1807598, n
Firmware: Firmware Version 1.00
Flash Compensation: 0
Focus Mode: 0
Lens Info: 15.1, 60.4, 0, 0
Lens Model: 15.1-60.4 mm
LeonieDF, thank you for your prompt reply & links to other Canon user problems. As mentioned in my reply to Keith above I think if anyone is using Final Cut Pro & has no problems with CR2 files that are high ISO - 800 - or long exposure times - 40 secs - then the problem is definately with Aperture.
I'm having the exaxt same problem. Very frustrating. The RAW file looks lovely before the Aperture RAW processing kicks in. Has anyone tried opening the files in Adobe Camera Raw to see if it can handle the files properly? (I need a new version of ACR...CS3 version not compatible with ML, it seems.)