How does JDF communicate extra production quantity that is needed for spoils/overages?
The production quantity requested for a job is placed in “/ResourceLinkPool/ComponentLink/Amount”. It doesn't appear that any quantities for spoilage that are in added by an MIS are added to the production quantity.
“MediaLink Amount” does include extra press sheet quantity to allow for spoils added by the MIS but in a digital workflow, the RIP is looking to “/ResourceLinkPool/ComponentLink/Amount” for the total amount of the product that needs to be run.
If the job is 100 saddle stitched books that can be completed inline on a digital printer and due to predetermined spoils calculations, the digital printer needs to run 105 then how could the JDF communicate this to the RIP?
Thanks. The saddle stitch example is just one scenario. There are other cases where there are post-press finishing processes after digital printing that extra quantities are needed for such as folding and cutting and the digital press operator wouldn't know to print extra copies if the JDF doesn't set the production quantity on the DFE for the extras. The DFE in question is a Fiery.
I can only add my 2 Cents from experience with conventional printing processes and all the finishing that follows.
There, we also use the AmountPool with Good and Waste being specified: Good as the amount to be produced and delivered to the next production step, Waste as the allowance in this current production step.
In your example, the final production step (binding) would have a Good quantity of 100, and a Waste of 5.
The production step before that, let's say, Folding on a folding device, would need to make 105 Good copies, with its own allowance of Waste="25" (just to have another number).
The previous step, i.e. printing, would now have to make 130 Good copies, and most likely gets its own "Waste" allowance on top.
Just build up the AmountPools of the Input and Output components accordingly. We usually read the desired quantity just from the Output ComponentLink/AmountPool, except at separating production steps like Cutting and Die-Cutting were the Input quantity appear the better place to follow up with counts.
Hope this helps in clarification,
It really depends on whether you are talking obout inline finishing or offline/nearline finishing:
Inline: you probably don't need to worry. The device will create 100 saddle stitched brochures and waste need not be specified.
Nearline/offline: Simply specify the total amount including overage. The dfe only needs to know how many copies it has to print. The future destination of these copies in an offline environment is irrelevant to the dfe and also the operator. The nearline finishing device, on the other hand, needs to know that is thas 105 input sheet sets and is expected to produce 100 finished brochures. Thus finishing has an input component with Amount=105 and an output component with amount=100
Instead of the simple ComponentLink/@Amount you need to specify ComponentLink/AmountPool that is partitioned by Condition Good and Waste. So 100 Good and 5 Waste. If not supported, you need to set @Amount to sum of Good and Waste.
But I am not sure which DFE would read AmountPool since they do not have an indication in their UI for Good and Waste quantities (I know most DFE UI).
Good and Waste is more a terminology used by conventional printing and offline finishing since they requires extra spoilage to setup production, that is not needed for digital printing with inline finishing.
If something fails, it is very easy for the digital press operator to print extra copies again so no need to precalculated values from MIS.
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