the last word

In conjunction with their annual photographic contest, the Weston Scholarship Fund is having an exhibition on May 5, and they’ve invited some guest photographers to participate. Gina Weston emailed me my invitation a few weeks ago. Last week I printed the picture. All guest work will all be matted to 16×20 inches, so I wanted… [Read More]

For the past few days, I’ve been trying to determine — yet again, with new criteria —  how much read noise is necessary to properly dither an analog to digital converter of a given precision. Specifically, I’m trying to figure out what the relationship is between dither and quantizing precision when resolving detail is the… [Read More]

Yesterday and the day before, I wrote a post aimed at discovering the relationship between dither and quantizing precision when resolving detail was the main criterion. The conclusion was that, just as for the avoidance of posterization (see here, here, and here), half a least-significant bit (LSB) was enough noise for most purposes. For critical… [Read More]

Yesterday I wrote a post aimed at discovering the relationship between dither and quantizing precision when resolving detail was the main criterion. The conclusion was that, just as for the avoidance of posterization (see here, here, and here), half a least-significant bit (LSB) was enough noise for most purposes. For critical judgements, it looked like… [Read More]

I’ve done several studies on how much noise dither is enough to eliminate posterization. How read and quantizing noise interact Read noise and quantizing, again More on read noise and quantizing The answer, for Gaussian noise dithering, is about 0.5 the least significant bit voltage, rms. When you’re doing the judging visually, in the tests… [Read More]