Dwight Kelly wrote: In case of CMYK, try to convert the image again. If the differences (caused by asymmetries between the A2B and B2A transforms) are below a certain threshold, you can assume the conversion already happened. Regards, Klaus Karcher

Hello Dwight, There is no pure technical solution for your problem. But anyway the a user of PDF-color-solutions has to communicate with people delivering untagged CMYK-data. In this communication he can state, that untagged CMYK-data are handled e.g. as ISOcoated_v2 or SWOP_TR001. If people delivering untagged data are not shure about the profile, the user of the PDF-color-solution should offer an proof of the untagged data in e.g. ISOcoated_v2 or SWOP_TR001. If the proof is signed by the customer, there is now a clear definition of the approbiate profile. If the deliverer don´t want to pay for a proof, he agrees that all further colormanagement on PDF data will be based on the communicated colorspace (e.g. ISOcoated_v2 or SWOP_TR001) In the case, that the deliverer of the PDF-data don´t likes and has not ordered a proof, the service provider can make a proof of the original data. For internal quality control at the side of the service provider, I recommend to define all major colortransformations in the workflow and judge the results by making proofs for source and converted data. Regards Jan-Peter Dwight Kelly wrote: -- *********** Neue Adresse / new adress ************ homann colormanagement ------ fon/fax +49 30 611 075 18 Jan-Peter Homann ------------- mobile +49 171 54 70 358 Christinenstr. 21 ------ http://www.colormanagement.de 10119 Berlin -------- mailto:homann@colormanagement.de *********** Neue Adresse / new adress ************