One of the reasons why many of these problems go undetected is that designers have the habit of making proofs from their layout, checking those proofs, and then creating PDF files. Reasons why PDF files contain errors or are troublesome The remaining 52% report less or no errors.25% report that between 10 and 50% are troublesome.17% report that between 50 and 90% of the PDF files contain errors.6% claim that over 90% of the PDF files they receive contain errors.The above mentioned GWG survey also asked how often respondents encountered issues with incorrect PDF files. To a lesser extent people also reported issues with corrupted fonts, corrupt PDF files, incorrect CMYK separations, missing objects, RIP errors and incorrect use of layers. If that is not the case, an operator needs to fix this manually or a new PDF file must be requested. A die line should, for example, be defined as a spot color named ‘dieline’ and set to overprint.
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