Dear Mauro, all, ISO 12647-7 is the standard that states proofing requirements today. There you can find (section 4.2.1) general requirements for a proofing substrate. The tolerance for the simulation of the production stock's white point is stated in Table 2. Hope that's what you are looking for? Best regards Claas Am 16.01.2011 um 14:31 schrieb Mauro Boscarol:

Hi Mauro, The dE can be calculated from dL*, da* & db* as it is the square root of the sum of the squares odd L*, da* & db*. The formula below shows how. Using [cid:image001.png@01CBB630.010FF6E0] and [cid:image002.png@01CBB630.010FF6E0] , two colors in L*a*b*: [cid:image003.png@01CBB630.010FF6E0] I hope this helps you. Best regards Sean Mr Sean Hillman Business Manager CERAM Tel. +44 (0)1782 764321 -----Original Message----- From: eci-en-bounces(a)lists.callassoftware.com [mailto:eci-en-bounces@lists.callassoftware.com] On Behalf Of Mauro Boscarol Sent: 16 January 2011 13:32 To: Mailing List [ECI-EN] Subject: [ECI-EN] Tolerance of proofing substrate color I have a question about proofing ISO 12647-2:2007 (or Fogra 39). The color of the print substrate used for proofing shall be in tolerance dE <= 3 with the color of the print substrate used for production (for example according to Media Wedge proofing process). My question is: which document (and section) is this value of dE <= 3 specified? 12647-2 Table 1 specifies tolerance not in terms of dE but individually in terms of dL, da, db. There is perhaps another document or another section? Can you help me? Thank you. Mauro Boscarol _______________________________________________ ECI-EN mailing list ECI-EN(a)lists.callassoftware.com http://lists.callassoftware.com/mailman/listinfo/eci-en Click the following link to report this email as spam. ================= https://www.mailcontrol.com/sr/wQw0zmjPoHdJTZGyOCrrhg== ----------------------------------------------------------------------------- For all customer enquiries, please contact Emma Tang or Carol Baddeley: Tel: +44 (0)1782 764428. UK customers: 0845 026 0902. enquiries(a)ceram.com www.ceram.com CERAM is the trading name of CERAM Research Ltd, a subsidiary of British Ceramic Research Ltd. CERAM Research Ltd, Queens Road, Penkhull, Stoke-on-Trent, Staffs ST4 7LQ, UK is a company registered in England with company number 1960455 and VAT number GB 729 8522 00. British Ceramic Research Ltd, Queens Road, Penkhull, Stoke-on-Trent, Staffs ST4 7LQ, UK is a company registered in England with company number 453225 and VAT number GB 729 8522 00. Where results above are issued in advance of a full report they are in accordance with the Conditions of business of CERAM Research Ltd and relate only to the samples tested. No responsibility is taken for the accuracy of sampling unless this has been done under our supervision. The information shall not be reproduced in part without the written permission of CERAM Research Ltd nor used in any way as to lead to misrepresentation of the results or their implications. Where the information is an early indication of the results of experimental work or of research and analysis it should not be used in advance of the full report. Where such information is to be the subject of discussion (in the report) which may lead to recommended values, guidance, limitations on its use or other caveats CERAM accepts no liability for its use in advance of the full and qualified report.