I posted here about my brain surgery last month and the recovery. Thanks to all who commented on the blog and sent emails. I deeply appreciate your good wishes. I’m doing much better now. I can get around with a cane — the walker is gathering dust – which means I have a free hand… [Read More]
Archives for November 2015
Nontechnical summaries to technical posts?
A reader sent me the following suggestion: You may wish to consider including (as a regular feature) within some of your more technically related posts (i.e.- Nov. 24th: “Sony a7II, a7RII high-ISO spatial filtering”) an included short paragraph – at the bottom of the more technically related posts (and maybe titled something like: “Practical Implications… [Read More]
Sony a7II, a7RII high-ISO spatial filtering
In several recent posts, there were reductions in dark-field noise at high ISOs with the a7II and a7RII that I attributed to in-camera processing. Spectral analysis of the images confirms this. For the a7II, on both sides of the transition point: fs is the sampling frequency. Values from dc to the Nyquist frequency are plotted… [Read More]
Achieving artistic maturity
Last Saturday night, my wife and I went to dinner with two artists who were in town for a workshop (My recovery has progressed to the point where I can now get around with a cane.) She’s a watercolorist; he works with oils. She asked an interesting question, which I will paraphrase as: “How does… [Read More]
Sony a7II FW 2.0 raw dark-field mean values vs ISO
In the previous post, I noted small (sub LSB) differences in average dark field images from compressed and uncompressed raw files from the Sony a7RII. This post repeats the testing and plotting for the a7II. I took a look at the mean values of a 200×200 central square of the same raw dark-field images that… [Read More]
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