For the couple of weeks, I have been spending way too much time trying to develop a way to demosaic infrared raw files without interpolation. My reasoning is that, with a deep IR filter in front of the sensor, that the spectral response of each of the color filter array (CFA) planes is pretty close… [Read More]
Search Results for: color space conversion
Image processing for in-camera histograms
There are several steps in getting to the JPEG preview image in a raw file. All of them except the last step, compression, apply to the in-camera histogram. For the purpose of this paper, I’ll assume that the compression/reconstruction process is lossless. It is not, but the lossy nature of the process does not affect… [Read More]
Normal in-camera histograms
Unless you use a specialized camera (e.g. the Betterlight scanning back), the histograms that you’re seeing on the back of your camera are not presented in terms of the primaries of the camera’s native color space. The way that most digital photography experts put it is that the histogram you see on the back of… [Read More]
Raw histograms
For the past nine months, I’ve been using the Betterlight scanning back. The software that runs the back has a capability that, as far as I know, is unique among all the current crop of digital cameras: it will display the histogram of the captured image in its native color space. In fact, that is… [Read More]
How many tones above the midpoint in your camera’s histogram?
This is a continuation of a previous post that dealt with an article in the March/April 2012 issue of photo technique entitled “Mastering the Camera Histogram for Better Exposure”. The context of the article is how to obtain the best exposure of a raw file. In a section of the article headed “Histogram Math” Wells… [Read More]