CMS: Adobe > sRGB. how?

[Gregory C]

how do I set up CMS for this situation?

the CR2 files from my Canon 350D apparently do not have the Adobe profile embedded within them. SF cannot see it. if I set up SF's CMS as follows, the output is great:

Input > Internal: None
Internal > Monitor: ColorSync
Internal > Output: RGB

Input profile: None
Internal profile: Adobe

Embed profile: True (embedding the Adobe profile)


if I set Input > Internal to "Use embedded profile", the output is not so great. I don't know why. possibly, SF assumes sRGB when the source files do not contain an embedded profile.

my question though is this. I want to output some files in sRGB profile for web use. how do I set up the CMS so that SF assigns Adobe to the source CR2 and converted cache files while converting to sRGB and embedding the sRGB profile in the output jpg/jpf files?

if I set Internal to sRGB, I am certain from experience that the colours of my CR2 files will be wrong.

regards,
Gregory

[LSI_Kratzenstein]

Currently Silverfast don't allow monitorprofiles as input profiles (in this case Adobe RGB / sRGB ... are monitor profiles).
On other hand CR2 files are raw files, and those are not in any particular colorspace. It is first converted by the Raw Engine, than enhanced by the whitebalance. To get the real colorspace, you should create an IT-8 calibration. The Information of the CR2 in the Exifinformations (0xA001 - Colorspace) is -1, what mean uncalibrated (Also allowed : 1 for sRGB and 2 for Adobe RGB).
What you could do : If you could handle a HexEditor, you could set the Exif Tag A001 from ff ff ff ff to 02 00 00 00 (Intel Byteorder) at position 000001e4 in CR2 files from Canon 350D. Then SilverFast should read this value as embedded colorspace.

kind regards

[Gregory C]

my Canon 350D camera has a setting allowing the user to choose sRGB or Adobe for the RAW CR2 colorspace. I chose Adobe so the RAW files are in fact in Adobe colorspace.

[LSI_Kratzenstein]

Could be for the embedded jpg file. But this switch has no effect on Rawdata, thats why they are raw data (read dirtectly from CCD, and put in file).
I didn't found the manual of the camera to download, but the movie shows me only a switch between sRGB and Adobe RGB, but not related to CR2 raw format.
And for my knowledge, rawdata shouldn't be matched to any colorspace. It should be raw. Thats what the name is for.
Would be nice to test, if the cam gives different results with the different settings.

kind regards,

[Gregory C]

from the pdf manual:

<img src="/img/forum/adobe_color_filename.jpg">


all of my CR2 images have names beginning with "_MG" instead of IMG. as such, I can only assume that they are using the Adobe colour space.

I have seen differences in colour based on setting CMS Input > Internal to either <use embedded profile> (which SF cannot see) or <NONE>. using <NONE> is far better than <use embedded profile>.

regards,
Gregory

(I can see the img in the message preview but not in the final post. what gives? I have both Disable HTML and Disable BBCode set to FALSE.)

[LSI_Kratzenstein]

The difference I like to know is between sRGB and Adobe RGB settings in the camera menu. Not difference with different SilverFast settings.
As you know, there is also a jpg in the cr2 file (possible). I think, the colorspace is related to this file.
As I said, the raw information is raw. So it can't be related to one or the other colorspace, it is everytime the same (device depend).

kind regards

[Gregory C]

you might be right (not surprising).

I just took two photos:
1. WB set to Flash (which is strange because when the CR2s are loaded in SF, their "As Shot" WB temperatures are set to 5950 -3 instead of 5500 0).
2. Manual exposure shooting our kitchen without changing the lighting.
3. the first photo with the camera in sRGB mode and the second photo with the camera in Adobe mode.

in SF, I processed them with WB set to Flash (rather than the 5950 -3 that SF defaults to) and no colour adjustments. CMS was set to: Input > Internal: <NONE>, Internal > Output: RGB, Internal: Adobe. scale was 21.6%. I saved the images as JPEG at 100% (why is there no EXIF saved with the exported jpegs or jpfs???)

the JPEGs in GraphicConverter looked similar but not the same. the colour in the _MG (Adobe) image looked *slightly* darker. could be my imagination.

can I send you the two CR2s via yousendit.com?

regards,
Gregory

[LSI_Kratzenstein]

You could send the images, if you like ( http://www.silverfast.com/problemreport ... opic=Usage ).
The differences wouldn't be in brightness but in saturation. Adobe RGB allows more saturation than sRGB.

kind regards