Re: match proofs when printing stoachastic
Hi,
There is nothing special going on with this type of screen. Staccato is like any other halftone screen AM or FM in the sense that the tonality/color you see is a function - in this case and simply put - of the tone curves being used, the substrates your printing on, the densities and ink rheology on press, and the initial press proof to alignment that was conducted. This assumes that there has not been a fundamental change in one of the basic variables - like blankets, inks, paper, plates, etc, etc.
Do you have a golden reference standard that you can rerun on press (i.e. a file, press sheet, proof and production/plates data) to see if under the same conditions you can rematch the press sheet from when everything was working correctly? This can help you nail down what might of changed in your process that is causing you issues. If you do not have such a reference standard in your shop, the best plan of action is to do some objective diagnostic tests. A press or a halftone screen do not "know" about car tyres - they "know" about max ink coverage, tone values, trapping, density, etc. So you might want to take the subjective tyre image out of the equation and just deal with the tonal elements that are incorporated in the image - that way you might help you break down the problem into its components to isolate which element(s) in your production process is causing you grief.
thx, gordo