On Thursday 18 October 2007 12:59:37 Mark wrote: > Michael, > > I believe you are mixing some things.
One of the things being mixed up is the difference between calbration and characterization. It is a common misconception that by creating a profile for a device that you are "calibrating" the device. A profile is at it's root a detailed description, or characterization, of the devices color and tonal charaterisics. Calibration is the process of making adjustments to the device to make it behave in a predefined way. When you profile a device you are characterizing the device not calibrating it. > I'm also a beginner to CMSs and > I am currently reading Real World Color Management. Is is really a > great book and it cleared many questions I had. > > For what you want to do you need 2 profiles: > one is the input profile - you get that picturing a target and > running that through a profiler (take a look at Lprof for that, its > open source and is said to deliver very good profiles), the other is > any standart RGB profile as you said (that would be ProPhoto, sRGB, > AdobeRGB,...). Most photo editing software will have the functionality to assign profiles to images and to convert images between profiles built to the software. For exmple, Photoshop and recent versions of GIMP have this functionality. All you have to do specify what profiles you want to use. > Profiles for standard RGB color spaces are shipped > with operating systems, apps, or downloadable on the web - so you do > not have to care about these, just have to find them:) > > Once you have the profiles you would create ONE transform out of TWO > profiles: LCMS does exactly that. At last you would then apply the > transform. Again your photo editing software should do this for you and you only need to worry about the details of how this happens if you are writing software that needs to use this functionality. > > Things can get a lot more complicated as you look at which image > manipulation works best in which colorspace... and which is then the > most appropriate colorspace for your application. > > HTH > Mark > > On 18.10.2007, at 20:00, Michael Shneier wrote: > > I am a new lcms user. I want to calibrate the color of a camera for > > use > > in image processing. If I understand correctly, I should develop an > > ICC > > profile for the camera and then transform images into a standard space > > for color processing. To do so, I would like to have an "identity" > > output profile so that I can run the algorithms in the standard > > (absolute calorimetric?) space instead of in the space of some output > > device. I understand how to create the basic profile, but how do I > > create an RGB->RGB identity profile for output? > > > > Thanks, > > > > -- > > Michael Shneier > > Intelligent Systems Division > > National Institute of Standards and Technology > > [EMAIL PROTECTED] > > Tel: (301) 975-3421 > > Fax: (301) 990-9688 > > > > > > > > ---------------------------------------------------------------------- > > --- > > This SF.net email is sponsored by: Splunk Inc. > > Still grepping through log files to find problems? Stop. > > Now Search log events and configuration files using AJAX and a > > browser. > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > _______________________________________________ > > Lcms-user mailing list > > Lcms-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/lcms-user > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Lcms-user mailing list > Lcms-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
