Perhaps we had to burn positives, then dupe the composite screened film into a negative, before plates were exposed, I really can't recall with any accuracy. I may only have performed this operation a handful of times back in the day, it was not very common. I believe that the original tint value was 15% for both background and text.įor offset printed work this would be best performed using workflow/RIP software at the highest possible resolution 2400 ppi or higher as supported by the platesetter.īack in the early 1990’s when I worked for a security and forms printing company, I had to make two separate sequential imagesetter exposures to the same piece of film in order to burn different screen patterns on the same separation. I used Photoshop bitmap mode halftone screen conversions as I no longer have easy access to an image setter RIP and or Workflow software that can apply different screening at the object level. This uses background "stipple" of 45° round dots at 120 lpi frequency and the VOID text is using a "line" pattern at 45° at 120 lpi frequency. I provided full instructions and a layered file earlier in the topic thread.
Put it on the copier.BAM!!! No grey box, just "VOID" appearing on the paper!!! WOW!!! JUST WOW! Thank you so much! I printed it out and all I got was a grey box, couldn't see anything else. So I converted it to bitmap 1200 dpi / 50% threashold and then connected the ends of the lines to the dots adjacent to them (no brush blur). I then studied the file and thought maybe if I connected the end points of the lines to the dots with the brush tool it would prevent the text from being visible at all on the original, but even with it set to 100% hard edge there was some blur to the brush. I put the print on the copier and the text did pop out a little more. The file you provided is INCREDIBLE! I printed the file out on our color laser printer (Phaser 7800) as-is and it didn't work very well (I didn't read/do what you instructed) as the grey box and VOID both printed although the text was just slightly visible against the background.
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