Category Archives: Color and Vision

Smarter image resizing

A bunch of us around the office were talking about the cool content aware image resizing algorithm that we saw on Doug’s blog. The idea behind Shai Avidan and Ariel Shamir‘s work is to find information-neutral “seams” in the image … Continue reading

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Deconstructing an image

Friends, I’ve been wanting to tell you about this for a while, and now that the beta public version of MATLAB R2007b is out, I can finally post. This will be the first of a series of articles about high … Continue reading

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Retinas are different but see the same thing

Here’s your color and vision article for the week from Dr. Color’s assistant (via the good people over at LiveScience.com). The first images ever made of retinas in living people reveal surprising variation from one person to the next. Yet … Continue reading

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Ask Dr. Color’s Assistant: Saturation

Dear Dr. Color: For the last few decades photographers have been infatuated with saturation. I suspect that if prints were compared with the original views that they would be more saturated than reality. It certainly does ‘punch up’ the picture … Continue reading

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Ask Dr. Color’s Assistant: Determining Monitor Luminance

Dear Dr. Color: I wish to measure the brightness of my LCD monitor so that I can set it to the recommended brightness for photo editing work. How can I convert the measurements from a hand held exposure meter to … Continue reading

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How does light get to the back of the retina?

The eye is a funny thing. One interesting factoid is that the light sensitive rod and cone cells are actually buried within the retina, sandwiched between cells that give structure and perform the first parts of image formation. “If that’s … Continue reading

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Digital Imaging Workflow

“Is it true that if you don’t use it, you can lose it?” — Steve Carell, “The 40 Year Old Virgin” Sometimes . . . at least temporarily. Or so I discovered when my inkjet prints looked terrible. Colors were muddy or … Continue reading

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Photography Technology Education from Google

I’m not one of those amateur photographers who conflates technology and picture-making. Gamma, MTF curves, ISO numbers, CCD, CMOS, ICC profiles, colorspaces, optics — you can make great images without really knowing what they technically mean or how they work. … Continue reading

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Ask Dr. Color’s Assistant – Colorspaces

Dr. Color’s assistant here. Here’s a recent question from the good doctor’s answering service that will be of interest to photographers. Hi, Dr. Color? What colorspace should I use with my new digital camera? What is a colorspace anyway? A … Continue reading

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Five Questions from a friend

My long-time friend and the most academically accomplished person that I know — who wishes to remain nominally pseudonymous but whose quirky pseudonym I just can’t bring myself to use — sent me the following interview questions. 1. What’s it … Continue reading

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Ask Dr. Color’s Assistant

It’s a crazy time here at The Metrowest Homeopathic Imaging and File Rehabilitation Center — the little office that Doctors Color, Compression, and FFT share with me, Doctor Format. Doctor Compression is happy to have most of the litigation behind … Continue reading

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Reverse-Engineering the Human Visual System

On Monday — just before staffing The MathWorks’ booth — I attended Maria Petrou’s plenary session: “Reverse-Engineering the Human Visual System.” I found it rather interesting, though it tried to cover too much ground for one hour.* Nevertheless, it was … Continue reading

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Color by Numbers

At the recent medical imaging symposium I bought myself a copy of Daniel Malacara’s Color Vision and Colorimetry: Theory and Applications from the SPIE Press. I managed to read the short monograph on the five hours of flights from sunny, … Continue reading

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Color management mailing list

Color management is hard business. I think of myself as fairly savvy in this area, but it took me a long time to get the basics down. (I recommend Tim Grey’s Color Confidence and Fraser, et al‘s Real World Color … Continue reading

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How a digital camera works

I began this technical article a week ago to synthesize different things I know about the digital camera pipeline and digital image formation. Photographers may be interested in learning what happens after they trip the shutter and before they import … Continue reading

Posted in Color and Vision, Computing, Fodder for Techno-weenies, Photography | 7 Comments