![]() ![]() In his 1990 book “Understanding Exposure,” intended for a wide array of photographers, he termed this heady brew the “photographic triangle.” Let us note briefly that the first “triangle”, consisting of film (later to become ISO), aperture, and shutter speed was initially concocted by Bryan Peterson. ![]() Texts about the exposure triangle demonstrate varying levels of authorial understanding of the roles and photographic effects of each of the component parts however, all of these authors emphatically and categorically maintain that exposure is determined by a combination of all three parameters, and changing the three parameters (shutter / aperture / ISO) in some concordant way will cause the exposure to remain the same. You won’t find very many photographic websites, blogs, or publications in general where, for the purposes of explaining exposure in photography, a model that uses as its basis the so-called exposure triangle, unifying in itself shutter speed, aperture, and ISO is not brought to bear. And now, let’s start deconstructing the myth. Lightness is data, while brightness is a visual perception which you can change by simply rotating a knob on your monitor. Lightness is more like filter transparency, a relative value determining what percentage of light will pass through, and not how bright the image will appear - that depends on the brightness of the light. * We are using the term " lightness" while referring to digital values, like it is used in Lab color space reserving the term " brightness" for where the actual reflected or emitted light is present. Lightness is often edited not only by and not primarily by scaling, but rather simultaneously with contrast, using curves, channel blending, and sometimes even local intervention (masks, dodge/burn, etc.).
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