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In 1976, Steve Suffoletto (Buffalo, NY) became a freshman at Rochester Institute of Technology (R.I.T.) in the College of Graphic Arts & Photography (GAP), in the School of Printing. There were about 700 students. Classes were 10 week-long tri-semesters. Below is a list for courses offered in...

A dE =<4.0 should be acceptable for uncoated envelope printing. Do you have a colorimeter or spectrophotometer for dE or just a densitometer? I think both of your devices are HP inkjet? Are they controlled by a Raster Image Processor (RIP) or Digital Front End (DFE)? If so, that software should...

Regarding color, do you have an instrument to measure dE? Is this regarding matching brand Pantone logo colors? A dE of 10 is very LARGE!

PDF of PowerPoint handout notes on "Ra" Roughness

"Ra" roughness value is provided by an instrument called a Profilometer. Some can also provide the topography profile curve. Most printers probably don't have this, but paper and blanket mfg should.

Are you talking about the vertical line on the yellow background toward the right? Or are you talking about the fuzz below the letters?

Hoping for data from a contact profilometer (diamond tip stylus) that shows X-height variation over distance. Provide numeric value of Roughness with Ra value, in microns (um). Sheffield uses escaping air flow (porosity) through paper fiber pores. An X/Y scatter diagram of that vs Ra would also...

Please define what you think the "problem" is? Are you talking about the edge definition of black type? It's been screened, perhaps to show a drop shadow artistic design?

Also, a visual would also be great to support it.

Hello PrintPlanet, Do any of the paper people have any data they can share about this? Ra is a metric of surface finish and its unit is 1 micron (um).

For troubleshooting and problem solving for root-cause analysis, it's helpful to compare and contrast, this vs that, before vs after. Is it happening only with one unit/color? Is it happening only on one side (gear-drive or button-operator) If chrome roller is not hydrophilic (desensitized), it...

Well, matching a press sheet to a hardcopy proof is one thing, but matching it to a soft proof computer screen/display is something else! You'll need an ICC profile to color manage your RGB display to match your CMYK press.

"Currently navigator tells the canon to print to gracol standard but on some prints ( typically blues and purples ) the canon output does not match the digital proof and is not within a tolerance to be usable as a judge of color for our offset pressmen." You confused me when you said the "canon...

Maybe you can send them a gray scale (continuous or stepped, 0-255 GL or 0-100% dot), have them print it, and then you will see the effects of their tone reproduction curve (compression, bumps, cutback, clips)?

For this example, I prefer the 2nd print on the left, it has some shadow detail. The first print on the right has no shadow detail. An image with a 10 gray scale pixel would be about a 96% dot size. A traditional sheetfed offset litho press would probably reproduce this as 100% (plug up, fill...

Make sure your film is matte textured to allow air to escape.

Can you spray a white diffusing paint (frosted) on the clear plastic?

Print out a 100% solid yellow patch, cover half of it with something opaque (aluminum foil), put it in a sunlit window and look at it covered section once a week.

Sounds like ultraviolet (UV) in natural sunlight is burning out (fugitive) the yellow colorant, dye. Is your printer colorants lightfast for outdoor usage, 72 hrs of exposure is typical.

BetaScreen has one for about $3,500. Ihara is another.