Sunset in Kruger

by MrFrench

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As this graph shows, the main differences between Canon and Nikon(Sony) sensors only really show up at low ISO: but at low ISO you can't really see the difference, not without post processing a RAW file. Here is the best post i could find demonstrating this (big) difference: Nikon DX vs Canon APS-C Now this difference will not matter to a lot of people ...


The camera sensor does not have a color space that allows going back and forth to XYZ since it does not have the same sensitivity curves as the human eye (Luther - Ives condition). The best that can be done is come up with a transform matrix that minimizes the sum of the errors in LAB for the set of standard colors (Gretab -Macbeth). I believe this process ...


You're right; the camera has its own native color space. When a camera is said to use or support sRGB (or Adobe RGB, as many also do), that means that it has native support for transforming its raw sensor data into that color space. When you use an out-of-camera RAW converter, like Lightroom or Darktable, that program needs to know about your individual ...


The sensor is fine ... or at least it was up to the 45Mp Merrill version. With the later Quattro version Sigma has abandoned the "pure" approach of capturing three colours at each location for a compromise, with fewer sensors in the lower layers. But the sensor is not the problem. Anyone using it knows that it excels at low ISO, but is inferior to Bayer ...


It's because the red channel has completely blown out, whereas the green channel hasn't. (Nor blue but that's not having any effect, here.) Suppose the true colour of the car is five parts red to one part green (the box on the left, below). If you underexpose the photo, you might find that the red channel's running at 50% intensity and the green channel ...


How can this be explained technically? Auto Exposure and Auto White Balance. The camera is trying to expose the image properly, but there's a huge difference in brightness between the shaded areas (most of the scene) and the foreground that's lit by strong direct sun. In order to get most of the image exposed correctly, it has to overexpose the car ...


Looking at an RGB histogram of the image, I'd say the red channel is blown. Hard to get deep reds in bright light, even when the overall exposure is a mid-tone, the reds blow out. I've had many pictures of dark red roses for example that look pink or orange.


My guess is that the phone's JPEG engine is trying to recover blown-out highlights in a way that results in this coloration artifact (as opposed to simply clipping them to white). It's probably trying to work with the color information it has, which would be the red around the overexposed areas, and possibly the yellow cast that direct sunlight would have ...

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