Color Measurement - Full Frame Reflective Delta E

Color Measurement - Full Frame Reflective Delta E Video Transcript

I'm going to walk you through an example and show you how easy the system is to use, and how simple it is to create this mapping that I just talked about. So let's set up the system and I will walk you through the example. We're going to go over a quick example of a real-world reflective color measurement from the print industry. Do these two prints match? One would be signed off by the customer which would be considered the proof or the standard or reference, and the other one is the first print coming off the line. The question is, "Do they match?" Before I print a thousand of these ... do they match?

We're going to walk through how simple it is to make this measurement on the Model 600. Previously, we've taken the standard image and we've saved it, so now all we have to do is measure any type of sample from now on to a full-frame measurement. So, we place it into the system. We start the measurement using the software. It takes about one minute to take the measurement.

During this one minute, I would like to take the time to describe some of the components of the system. The Model 600 Imaging Spectrophotometer is mounted up high in the chamber. We have two DC modules. These DC modules are DC-controlled, very tightly controlled output, with a very specific spectral output. And the enclosure ... this particular enclosure is scaled so that we can measure A-size prints. The enclosure is black in color because we want to control all secondary reflections and we also have a chamber because we want to control all secondary reflections as well as the exterior or environmental light from polluting our measurements. So those are the different components. The table ... you can purchase an optional vacuum table and there are many other options for the chamber.

Okay, the measurement is complete. Let's take a look at the full-frame delta. We clicked on the full-frame color difference capability. The color images sample is being created and now we see it in front of us. So this image right here represents the standard image and this represents the sample image that we must measure.

The first thing we do before we can complete a full-frame comparison is that we must align the two images. There is an automatic algorithm in here that aligns the sample image to the standard image. You may or may not on this video be able to see that it did move and rotate. So now these two images are perfectly in line. I am going to press the calculate button. What is happening during this process is that 1.2 million color differences are being calculated, one for each pixel location, and the complete mapping is now shown here in the lower right corner. Any pixels in this image that is color coded green represents a delta-E of less than 2.5; anything in yellow is less than 5.0, and anything in red is less than 10. These three ranges are user programmable. That happens to be the values that I have currently set them at.

We also have cursor capability. You can come in here and look at colors within the individual areas of the image itself. But the big, powerful capability here is this full-frame mapping. So that full-frame mapping can now be printed out in color for historical purposes; you can generate a full-frame difference; generate the hard copy mapping which you can use for records, historical purposes, or quality control ... full frame! One hundred percent of the area has been calculated for delta-E. A very powerful system and you saw how easy it was to generate this delta-E mapping. We're extremely excited!