what is a tone mapping,and how we do it ?
Thanks for the question, Victor, about tone mapping. Actually you do tone mapping every time you adjust curves or levels to change the tonality of an image: you are mapping the tones of the image to a new range of tones – those which you prefer. For example, if you squeeze a wide range of tones into a narrow range, you map a low- contrast look to a high-contrast look. Curves are a visual display of a tone mapping. Modern tone mapping goes further, however, in that they add an extra dimension: the relationship between neighbouring areas of tone. This adapts the effect of curves to local conditions, giving a more refined result. Thanks for the question, Simon. I should have made it clear in my blog that the technique can be used with any digital camera – it doesn’t have to be a dSLR. Come to that, it can be used by film cameras too, using the scanning technique I describe. And if you don’t have bracketing on the camera, it’s best to work with a tripod so you can set over- and under-expos
