![]() ![]() They hold profile data that is used by the graphics program's CMM (Colour Management Module) to 'correct' the image, not calibrate the screen. ![]() The term image correction is key here, as that is how ICC profiles work. This means that any program that is not ICC aware will not use the ICC profile data for image correction, and so will display any image only partially correctly. The ICC profile acts within any ICC aware graphics program used within the PC, effectively correcting the gamut of the image before it is displayed on the partially calibrated display. A 3x3 matrix can only manage gamut as a single entity, using the 6 flat plane sides of the matrix, without any volumetric information at all.įurther, the 1D LUT component may not even reside within the display, or may be 'supplemented' by 1D LUT data held within the video card's VCGT (Video Card Gamma Table), or even within the ICC its self, where the 'corrections' are applied as image manipulations.Īny volumetric gamut information (measurements that are within the gamut of the display - see Profiling Patch Count below), if there is any, will be held within the associated 'display' ICC profile for linked 'software calibration' via image manipulation. The problem is that when an ICC based calibration system is used to attempt to directly 'hardware calibrate' a display (no software ICC profile involvement) it does so just with a 1D LUT for grey scale/white point management, and a simple 3x3 Matrix for gamut (colour). Potentially all ICC based corrections aimed at 'display calibration' could be held within the ICC profile, but never are all corrections held within the display's own hardware. software calibration, as some of the display calibration is potentially held within the display, while other aspects of the calibration are held within the ICC profile, so are software based, and are in reality image manipulations, not display calibration. With ICC based display calibration this is termed hardware vs. It is vary rare, to the point of virtually being unheard of, for any display to actually be accurately calibrated in and of itself when used within an ICC based workflow. This means different aspects of display calibration are held within different 'locations', potentially including within the display itself within the ICC profile and even within the graphics card. One of the issues with ICC profiles is they use a distributed method for colour management, which includes display calibration via image manipulation. We do not consider a 1D grey scale/white point LUT combined with a 3x3 matrix to ever produce an acceptable level of calibration, due to a total lack of volumetric data. Throughout this page we are also focused on the best possible display calibration, as is attained via a 3D LUT using ColourSpace. ![]() However, after reading this page it should be apparent that better colour workflows can be attained for use in any industry if the display is self-calibrated to a highly accurate level using a 3D LUT, with the 'display' ICC profile reduced to a simple colour space definition, as is outlined at the end of the page. It makes no attempt to assess the suitability of ICC profiles for use in any other industry. ![]() This enables far simpler, but far more accurate, colour management to be used, where the display device (display/monitor/projector) is calibrated to a given standard in isolation of any and all input sources.Īs a result, understanding ICC profiles can be extremely difficult for those used to the far simpler, and far more accurate, 3D LUT based approach to colour and look management, as used within the film and TV industry.īy necessity, this page highlights the limitations and issues of ICC based 'display calibration' for use in the Film & TV industry. The film and TV industry relies on a far higher level of colour matching accuracy, due to the similarity of all viewing mediums and environments. More importantly, the level of colour accuracy required for ICC profile operation for these companies and individuals doesn't match those of the film and TV industry, as the majority of the requirements have come from the print world, where colour accuracy is more subjective than absolute, due to the inexact nature of attempting to match different reflective print mediums while viewing source images on a direct display monitor. The ICC profile was developed by a large number of companies and individuals, from a range of different industries, all with varying requirements and needs, resulting by necessity in a complex workflow solution that contains a large number of options, variations, and functions. ![]()
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