Blog Archives

Delta E (CIE 1976)

The Equation

The color difference, or ΔE, between two colors: L1a1b1 and L2a2b2 is:

Equation 1

A Definition

ColorWiki.com reports Delta-E (dE) is a single number that represents the ‘distance’ between two colors.

An Illustration

1931 CIExy Chromaticity Diagram

Statement of the Problem

When I conceived this idea, I had just brushed the surface of color knowledge.  I soon found out that few spectrophotometers or colorimeters capture the colorimerty data from the emitted light on a display device.  Display characterization devices, such as the X-Rite i1 measures the light to calibrate, but provide no numerical color data. Such devices do not output the spectral data. After many inquiries to X-Rite and waiting for the engineers to return my call, I finally got an answer about SpectraShop 4, software program that would not only measure, but provide a report of measured colormertic data. SpectraShop 4 is a great piece of software. I think that it has great potential for future use of color measurement needs.

This study has practical application for mobile device manufacturers. Creators of content for mobile devices would be the other group of people who would benefit from this research as users of the content. The industry needs to educate the consumers who might make important color decisions using a mobile device that does not accurately reproduction the original image’s color correctly.

The problem is a current issue that needs to be solved. The population affected is overall is huge and includes all countries that have mobile devices. People who own smart phone are usually innovators and influence others. This is important to understand because the mobile device market is only going to increase. Industries that will be effected include graphic design, publishing, medical testing, food quality and most sciences. Anyone who makes a decision based on color from a mobile device would benefit from the finding and conclusions of this study.

This study’s problem stems from the relationship of the mobile display’s technology and how this technology accurately renders color. The dependent variable is control image. The causal or independent variable is the sample of current mobile devices and is responsible for the change in problem variable. The control image is a function of the mobile device and the differences will be examined. If there is a change in causal variable (as a change in device), then there is an expected change in the problem variable.

 

Four-Color Booklet

Still working on this one……

This booklet was created as a group project by myself and three other students in DIGM 4373: Graphic Production Process Control III the University of Houston.

The booklet contains bleeds which extends the color off the edge of the page and is trimmed off. The design was created in Adobe InDesign.

Screen Shot 2012-12-06 at 12.27.24 PM

An imposition was created using Kodak Preps. The  polyester press plates were created on the Mitsubishi SDP Eco 1630 Digital Image Setter.

Ryobi 3302HA

Ryobi 3302HA

The Image Transfer Lab runs a Ryobi 3302 HA 2 color offset lithographic printing press. To create a full color document, it requires two runs through the press. Cyan and black were printed on the first run. At the next run date, careful alignment and registration was made to ensure that yellow and magenta fit into it’s place and that the other color densities were met.

The signature sheets were printed with the final output pages in the proper position so that when folded the pages are in order. Two right angle folds were efficiently done with the Mathias Baurle folder; which is a buckle folder. The booklet is then saddle stitched using the Bindery-Mate stitcher. This makes the document lie flat and it opens completely. The booklet was trimmed into fished output using the Challenge 265 paper-cutter.

Page 1Page 2Page 3 DIG_4373_SalehA_8-page Booklet_4_Page_4

DIG_4373_SalehA_8-page Booklet_4_Page_5DIG_4373_SalehA_8-page Booklet_4_Page_6DIG_4373_SalehA_8-page Booklet_4_Page_7 DIG_4373_SalehA_8-page Booklet_4_Page_8

Illustator Live Trace and Recolor

I used the  Illustrator file below in the business cards for Leesa…

 

Leesa's Business Card

Leesa’s Business Card

 

Here is a .jpg example of what the tools in Illustrator 4
can do. Live Trace was set to six colors and then expanded. Then
a new color group was created by limiting the selection the “Pop Art” color swatch library. Color harmony is assigned by using the color wheel and saved as a new group. The image is now recolored and has a cool effect.

Leesa Harrington-Squyres

Adobe Illustator’s Live Trace Tool