Jack Koo

Hi this is Jack. I’m an intern at Ignotus Editions. This blog will help me keep track of what I’ve done!

 

Jan 27, Friday 10am-4    | Nozzle Check, Color Calibration, Printer Operations.

First day at Ignotus. My first surprise working with Paul Hertz is how much better color looked on print than on the screen. We set up the printer to clean the nozzles since Paul had been in Spain and we don’t want clogged nozzles. Printers need to be constantly in use to prevent the nozzles from being clogged up by dry paint. After the nozzles were cleaned, we went over basic concepts of Color Workflow. We calibrated the the monitor with colormunki to make sure the prints color looked almost identical to the monitor. Then we went over some basic steps to operating the digital printer. Loading/unloading paper, loading unloading inc, printer settings, printing etc.

 

Jan 31, Tuesday 10am-3    | Packaging Paper, Image Processing.

We were preparing for the opening of QuadCore exhibition. Learnt about packaging paper for transport. As always, Paul is very delicate with the paper. Each print has paper layered between to prevent friction damage. The paper is then put into a plastic bag to prevent rain damage, and then put into a hard cardboard case. Paul got called that he couldn’t install that day, so we went over Image Processing. Raw photo files had a lot of information that we could pull out and show details in monotone sections of the photo that we can pull out. We also sharpened areas for clearer print, and got rid of camera artifacts.

 

Feb 1, Wednesday 6pm-9    | Java Syntax, Eclipse Functions, Swing Layouts.

Paul wanted me to learn Java for the collage web application that he’s been planning to make. I’m very familiar with C++ and Processing, which made java a breeze to learn. I learnt about basic syntax, eclipse functions, and swing layouts.

 

Feb 3, Friday 8:30am-4    | Transporting Paper, Installing Prints.

Preparing more prints and transporting it to the QuadCore exhibition for installation. We printed an extra print to take to the exhibition (You should print daily to ensure nozzle hygiene). At the gallery we measured the space we had and calculated how many prints would fit with reasonable margins. The 36 inch print in the middle almost took three people to set up. Two people needed to hold it, and on person had to snap the magnets to the screws that we inserted into the walls.

Duotone Soft Proof

Can’t soft proof a duotone in Photoshop. Have to convert to RGB to soft proof; however, the color changes in subtle ways.

One way to compare the images is by checking their histograms.

The duotone image is just a little darker on average (mean 106.97 compared to mean 112.53), and it clearly has pixels in the darkest bins, including a spike of 0% black over on the left edge of its histogram. The RGB image has no black pixels until you reach level 11, about a 4% gray.

Comparison of two histograms

Comparison of RGB and duotone image histograms

You can use Curves adjustment layers to compare the dynamic ranges of the two versions of the image. Option-drag on the black point or the white point in the Curves dialog to see where in the image the darkest and lightest values are found. The duotone reveals solid black (0%) in a few places. The RGB version has no solid blacks. In the light tones, the two are practically the same.
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ColorMunki Quirks

The ColorMunki color profiling device from XRite is one of the core technologies of my color workflow, but it has its oddities. Fortunately, there are some workarounds–and where there are none, patience is a virtue. Profiling a second monitor presented some difficulties, and the device has some ergonomic design shortcomings. You also have to learn to deal with a few good features.

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