Color is our perception of reflected light across the visible spectrum. When light hits an object, it absorbs some rays and reflect others. The color of light that reflects back into our eyes is the color we perceive. The more light an object absorbs, the darker it appears. With black, very little light is reflected.
Pure black in the presence of light wasn’t achieved until 2014 when Surrey NanoSystems announced the invention of Vantablack. This high-tech artificial substance absorbs 99.965% of all light that hits it, from the ultraviolet, through the visible and well into the infrared spectrum. When applied to an object, Vantablack makes the object look like a flat, bottomless void in space.
Here you see a crumpled piece of aluminum foil, with Vantablack covering the middle. There is so little reflection you can’t even perceive the wrinkled texture!
Image Copyright Surrey NanoSystems 2017
Have you ever sent out a job that passed your inspection, only to have the customer reject it for out-of-tolerance color? You recheck the data and the instrument says the color passed the agreed tolerance… why is the customer saying it doesn’t? We get a LOT of these conflicting measurement calls in technical support.
The solution is simple – document a color control program that clearly defines how to assess color, then make sure everyone (including your customer) follows it. Today we’re sharing what you need to include in your program so you can begin working with confidence.
In a perfect world, you should be able to put ink in the press, run a job, and achieve color consistency. Unfortunately, every year flexographic and gravure printing operations waste ink, substrate, and press time trying to get color right.
Although advancements in technology have made it easier to achieve color accuracy, the variables that affect color still exist. In this three part series we’ll share over two dozen reasons your color might be wrong at press side. Today’s topic looks at issues that can affect your color measurement instrument and substrates.
Using a spectrophotometer to measure color doesn’t necessarily mean you’re going to capture accurate data. The most common reason for incorrect measurements and inconsistent readings among instruments is using the wrong device settings. Today we’ll look at five things you must consider when setting up your device and taking measurements.