Archives for 2015

A reader commented on the previous post: The real tough part of posterization is when a gradient is colored and you get hue shifts as the color channels step across bins individually. Can you redo this test with a color gradient, like maybe 0.6 0.8 1.0 relative values to the channels? Pleased to do so…. [Read More]

About a year ago I wrote a post on how read and quantizing noise interact in a digital camera. I concluded that, when the standard deviation of Gaussian read noise exceeded one-half the least-significant bit (LSB), the read noise provided sufficient dither that further increases in ADC precision would offer no increase in average digitizing… [Read More]

The spirit may move me to comment on one or two narrow aspects of my photographic journey from Sitka to Seattle, but I think it’s time for me to summarize my experiences. If you want to start this report from the beginning, look here. A little context: as I said at the outset, I eliminated… [Read More]

We stopped at some fishing villages, and there were  interesting things to photograph.                

This is a continuation of a report on a trip with the Sony a7RII. The series starts here. Rather than post more pretty pictures from the Alaska trip today, I thought that I’d show some things that might be useful to photographers planning something similar. Here’s an inflatable (which I’ll call a Zodiac, even though,… [Read More]