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Thread: What are "blue lines?"

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    Junior Member resdog is on a distinguished road
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    What are "blue lines?"

    My boss has sent me on a task to proof the "blue lines". The proofs are just color proofs, but it got me thinking...why do they call it "blue lines?"

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    Moderator super silja will become famous soon enough super silja's Avatar
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    Quote Originally Posted by resdog View Post
    My boss has sent me on a task to proof the "blue lines". The proofs are just color proofs, but it got me thinking...why do they call it "blue lines?"
    please read
    http://www.wikihow.com/Make-Blueprints

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    Junior Member resdog is on a distinguished road
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    Thank you for that link and response. It was very informative. However, it does lead me to my next question, is the "blue line" term just a throwback from times past, before the digital age?

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    PRC Member DoctorBlade is on a distinguished road DoctorBlade's Avatar
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    Quote Originally Posted by resdog View Post
    Thank you for that link and response. It was very informative. However, it does lead me to my next question, is the "blue line" term just a throwback from times past, before the digital age?
    In my understanding, it is termed blue line due to the information you have read before from the link... and since it is proofing FPO (For Position Only), it allows you to check if all page elements are within the printing boundary or are there bleeds and if there are, are these bleeds overlap each other? It is termed blue line because you normally print the whole signature together with the lines (dotted line or thin colored lines) showing the page boundary, bleed lines and page margins.

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    Banned leila is on a distinguished road
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    Quote Originally Posted by resdog View Post
    ... is the "blue line" term just a throwback from times past, before the digital age?
    Before the time of CTP with ROOM workflows and digital proofing, these diazo/ammonia copy machines were used to copy the films on paper sheet to make exact and reliable proofs... cause before ROOM workflows, the ONLY way to have absolutely reliable paper proofs was to output the films (manual strip or film imagesetter) and to make the proof FROM the films :

    - black and white proofs (for texts and position) with diazo/ammonia copy machines,

    - colors proofs with Cromalin machines.


    Long time ago, I had a sub-contractor whose job was only to output films from the files supplied by the customers (sorry, i don't know the english name of this job... a little help to improve my english vocabulary will be welcome!), who made systematically a diazo/ammonia proof of ALL the films that he outputted, to keep a trace, a record, of all the films sold, both to help him to make his invoices, and in case of problem with the client or the printer.
    Last edited by leila; 06-06-2011 at 01:24 PM.

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    Junior Member tedlsng is on a distinguished road
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    The bluelines is a imposition proof, like Ozalids in film prepress

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