Today I continue exploring using a technique to produce half-sized images from sensors with Bayer color filter arrays (CFAs). The technique was described here, and the way I’m implementing it was explained here. I started with a raw file of this scene, photographed with the Sony a7R and the Sony/Zeiss 55mm f/1.8 Sonnar FE (aka… [Read More]
Color photography without demosaicing in practice
Yesterday’s post trotted out an idea for producing moderate resolution files from high-resolution cameras without demosaicing, and speculated that such files might show higher quality and fewer artifacts than similar-sized filed down-res’d from demosaiced raw files. I looked around for a tool to perform an experiment. I didn’t have to look far. DCRAW has an… [Read More]
Color photography without demosaicing
In the beginning, digital photography sensors were monochromatic. If you wanted color, you made three successive exposures through different filters, which were usually mounted on a wheel for rapid sequencing. A variant of this approach was to use a series of prisms and half-silvered mirrors to split the imaging light into three beams which were… [Read More]
The Pentax 645Z
There have been rumblings for months about a new Pentax 645 based on the Sony 50MP 33x44mm chip that’s in the Phase One IQ250 and the Hasselblad H5D-50c. The buzz was that it would be cheap (for a medium format camera) and that Ricoh would put some marketing, service, and distribution wood behind the camera… [Read More]
How to expose the moon?
Last night’s lunar eclipse occasioned a flurry of web traffic about how to set your camera to expose it correctly. I got to thinking – not always a good thing – about the problem, and the more I thought about it the harder it seemed. Let’s assume that you’re making an image and you know… [Read More]
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