The result is an image that looks right but doesn't lose the extra highlights you've captured. When used at ISO 200, the effect is the same as underexposing an ISO 100 shot by one stop, then pulling up the mid tones and shadows to compensate. Turn this on and the 600D captures an extra stop in the highlights, resulting in an overall range that at least matches that of Sony and Nikon models. It does this by applying less amplification to the signal coming from the sensor, then compensating for it by using a different tone curve to ensure the correct brightness in the final image. The Highlight Tone Priority option (Custom Function II.6) is a method for capturing more information in the brightest parts of the scene. The wedges below the graph are created by our measurement system from the values read from the step wedge, the red lines indicate approximate shadow and highlight range (the dotted line indicating middle gray). You can compare the dynamic range of images captured using the camera's various parameters, or you can select up to three other cameras to compare. Note: this page features our new interactive dynamic range comparison widget. Shadow range is more complicated in our test the line on the graph stops as soon as the luminance value drops below our defined 'black point' (about 2% luminance) or the signal-to-noise ratio drops below a predefined value (where shadow detail would be swamped by noise), whichever comes first. To most people highlight range is the first thing they think about when talking about dynamic range, that is the amount of highlight detail above middle gray the camera can capture before it clips to white. Hence there are 'two sides' to our results, the amount of shadow range (below middle gray) and the amount of highlight range (above middle gray). Each step of the scale is equivalent to 1/3 EV (a third of a stop), we select one step as 'middle gray' (defined as 50% luminance) and measure outwards to define the dynamic range. A single shot of this produces a gray scale wedge from the camera's clipped white point down to black (example below). Our Dynamic Range measurement system involves shooting a calibrated Stouffer Step Wedge (13 stops total range) which is backlit using a daylight balanced lamp (98 CRI). Canon EOS Rebel T3i/600D Dynamic Range (JPEG)
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