October 2018 - colorsync-users

Getting the primaries of a profile
by Adriaan van Os 25 Oct '18

25 Oct '18

I need to get the primaries of an ICC profile. For example, for sRGB the required values are Red Green Blue x 0.64 0.30 0.15 y 0.33 0.60 0.06 I assume that with v1 profiles, these values were given by the 'chrm' tag (see <https://developer.apple.com/documentation/applicationservices/1560273-0_pro…>) Als this tag seems to be v1 only, for v2 and v4 profiles, I looked at the 'rXYZ', 'gXYZ' and 'bXYZ' tags instead. However, each ICC document I looked at, gives another definition of these tags, e.g. for 'rXYZ' ICC v2, ICC.1 2001-04 "Relative XYZ values of red phosphor or colorant." ICCv4, ICC1v43_2010-12 "This tag contains the first column in the matrix, which is used in matrix/TRC transforms." iccMAX, ICC.2-2018 "The colorEncodingParamsStructure ceptRedPrimaryXYZMbr element represents the nCIEXYZ values of blue colour space encoding primary encoded using either 2 or 3 numbers. The first value represents the x chromaticity. The second value represents the y chromaticity. The third value (if present) represents the z chromaticity. If only two numbers are present the z chromaticity is assumed to be the value of one minus the sum of the two numbers. If three values are present the sum of the three values shall be 1.0." When I look at sRGB IEC61966-2.1 with the ColorSync Utility, I see that the 'rXYZ', 'gXYZ' and 'bXYZ' tags actually represent the values of a Bradford-corrected transformation matrix from sRGB D65 to XYZ D50. Can someone please clarify ? Thanks for the help. Regards, Adriaan van Os

2 4

#CIC26 Early Registration Ends Oct. 14 – Save up to $370
by Roberta Morehouse 11 Oct '18

11 Oct '18

CIC26 | November 12-16, 2018 | Vancouver, BC, Canada Just 4 days left to take advantage of early registration for #CIC26. Register by October 14 to save up to $370! Short Course discount, Student, 1-day, and Group Rates available. *Take any THREE or more Short Course for 10% off + early registration savings *Bring your colleagues—group rates available for 5+ registrants, contact IS&T for details *Not a member? Include IS&T membership (new or renewal) with your registration along with an online subscription to the Journal of Imaging Science and Technology (JIST) or Journal of Electronic Imaging (JEI)—all for the same price as the non-member fee. ABOUT CIC26 Learn about the latest in mobile imaging, displays, color, and more at the 26th Color and Imaging Conference (CIC26) in Vancouver, BC, Canada, November 12–16, 2018. CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. PROGRAM HIGHLIGHTS: *3 Dynamic Keynotes on “Superpixels”, “Colour and Consumer Cameras”, and “High Dynamic Range on the Big Screen” *Evening Talk from Andrea Chlebak, feature film colorist on films Hollywood heavy hitters “Mandy”, “Elysium”, “Chappie”, and The Twilight Saga: Eclipse *Short Course Program provides in-depth instruction from basic to advanced topics organized by tracks to guide your learning strategy *Workshops on the latest technologies: Virtual and Augmented Reality, Deep Learning and Color, and HDR and Movie Production The CIC program covers a large variety of imaging applications such as high dynamic range (HDR), mobile imaging, virtual reality, endoscopy, laparoscopic surgery, biomedical imaging, color harmony, and more. Learn more & register http://snip.ly/onyi2r Hosted by the Society for Imaging Science and Technology (IS&T) Connect with our community! Twitter: @ImagingOrg #CIC26 LinkedIn: IS&T Color and Imaging Conference (CIC)

1 0

New book - Understanding Color Management, 2nd Edition
by Abhay Sharma 01 Oct '18

01 Oct '18

New book - Understanding Color Management, 2nd Edition, Sharma, 2018 In case you need to provide a reference to the colleagues in your office on basics of colour, please consider my new book Understanding Color Management, 2nd Edition, Abhay Sharma, John Wiley & Sons, September, 2018. It features latest equipment including Techkon, Konica Minolta, Barbieri and emerging concepts such as expanded gamut and XML encoding. Many software products are reviewed such as ColorAnt, GMG, CGS and of course X-Rite i1Profiler. I welcome any feedback, comments/corrections. Abhay Sharma Ryerson University, Toronto

1 0