Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Aperture RAW conversion with Canon G1X

I've recently noticed that my images are coming out very dark when using Aperture to convert RAW files from my Canon G1X. The initial preview is fine but then it changes after a few seconds when I open it for editing. I notice minor differences in all of my images but the problem seems to be most significant among long exposure/night shots. The first image was imported to Aperture 3.4.3 as RAW and exported immediately as JPEG. The second image was opened as RAW in Canon Digital Photo Professional and exported as JPEG using default settings. Can anyone help? I'm using a Macbook Pro 2.2 GHz running OS X 10.8.2.

User uploaded fileUser uploaded file

Aperture 3, OS X Mountain Lion (10.8.2)

Posted on Nov 28, 2012 8:49 PM

Reply
15 replies

Mar 7, 2013 3:27 AM in response to cgawlak

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

Mar 8, 2013 6:08 AM in response to Keith Barkley

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


/Library/Extensions/NVDAResman.kext/Contents/MacOS/NVDAResman

./Library/Extensions/NVDAResmanG7xxx.kext/Contents/MacOS/NVDAResmanG7xxx

./Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework /Versions/A/Headers/Transform.h

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 :

http://lclevy.free.fr/cr2/

Canon CR2 specs

http://www.kenrockwell.com/tech/sycc.htm

Canon CR2 files sYCC

http://en.wikipedia.org/wiki/YCbCr


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

FNumber: 6.3

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

ImageStabilization: 259

Lens Info: 15.1, 60.4, 0, 0

Lens Model: 15.1-60.4 mm

Mar 8, 2013 6:12 AM in response to léonie

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.

Apr 23, 2013 12:37 AM in response to xtravoice

I sent the following to 'Aperture Support' (Aperture Drop down menu - Provide Aperture Feedback) & got a response. See below dotted line


At a guess Apple is having problems with upper management shifting all its software resource over to where the big money is coming from - iPhone & iPad.

The problem we are seeing here is not confined to Aperture but much deeper down to CMM library level which is why the problem hits other Apple programs i.e. Preview, Colorsync ….

Apple has left OS X with little or no staff to meet the demands of either something new (Aperture 4) or fix bugs inherent in the current library structure. For those working in the OS X department its 'Buddy can you spare a dime' situation.

Even more unfortunately Apple needs a technocrat at its helm who is OS X oriented, otherwise it'll be shades of Sculley all over again.

Pray for rain! Apple has got a nice shiny skin but unless they get their act together & put OS X back on track Aperture 3.4.4 (which does not resolve the Raw Green problem) might be the last version.


-------------------------------------------------------------------------------- -------------------


Sent to Aperture Support Feedback (See Aperture drop down menu)


Apple applications - Preview, Colorsync, Core Image & Aperture - fail to process Canon G1X RAW images correctly for night time shots under Mercury Vapour lighting. The resultant RAW file images are bright green.

Both Canon DPP & Raw Photo Processor 64 process RAW cr2 images correctly.

The on-camera processed RAW image to JPG has the correct colour image. Under 'Auto' mode on the camera there is an option HG - on/off (HG is mercury lighting)

But 'Auto' mode does not allow RAW images. But the point is that Canon know about this as does Raw Processor 64 & handle the processing correctly. The Apple Digital Camera RAW Compatibility Update 4.04 fails to implement correction this process.

I have no problems dealing with RAW images with Sony or Panasonic.

I have no problems with Canon DPP (Digital Photo Professional).

I have no problems with Raw Processor 64.

I have run memory core dumps on both Preview & Aperture to see what the differences are between Canon image processing & Apple application processing.

DPP uses very little legacyCMM library functions & half the number of *Foundation* library functions compared to Aperture.

Bottom line is that Apple applications are not handling Canon cr2 YCC format conversion properly.

I can only guess that the G1X HG on/off option is presumed by Apple to be selectable in modes other than 'Auto'. Unfortunately this option is not available in 'Manual' mode where RAW imaging is available. There no white balance adjustment compensation in 'Manual' mode as Canon 'process' the image for correct white balance in Auto mode for the jpg image.

Thus this process is carried out by Canon DPP & also by Raw Processor 64 but not by any of the Apple applications - Preview, Colorsync, Core Image & Aperture.

Would be nice if this problem is corrected wit the next Apple Digital Camera RAW Compatibility Update.

Aperture RAW conversion with Canon G1X

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple ID.