Auto lighting optimizer là gì

As camera manufacturers started realizing the limits of digital camera sensors, they started trying to increase their range. Today’s sensors have a range of around 7-9 stops of light, depending on the manufacturer. It is said, at any given point in time, the human eye can see about 14 or 15 stops of light. This difference between what we see & what a camera sensor ‘sees’ is the gap technology has been trying to fill, both in terms of absolute range on the sensor and manipulation techniques once the image is captured.

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On Canon cameras there is a feature called Aukhổng lồ Lighting Optimizer (ALO). On Nikon cameras the aproximate same feature is known as Adaptive D-Lighting. Other cameras have the same basic feature. While the names are different, the idea is the same; increase the dynamic range presented in the final image.

The Canon Auto lớn Lighting Optimizer functions by bringing out shadow detail as I will show in the following photos. All the photos are cropped down khổng lồ show the same area and lighting. Lighting was constant và a manual setting of ISO 100, f/11, 1/400 was used on a Canon 7D và Canon EF-S 10mm-22milimet lens. The pictures progress from the ALO being Disabled, then Low, Standard & Svào. Note: this function only affects JPEG images as RAW images are intended to lớn give an exact copy of the sensor information. To help with detail, all images were increased by 1 stop of exposure in Lightroom, otherwise they are right out of the camera. Cliông xã on an image for a 2000px wide version.

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The Histograms show where those highlights are nearing the edge on the right as well as how the dark areas have been marched over as well. There also seems khổng lồ be a much larger jump from Standard to Svào as evident in the intensity of the light measured.

For those who shoot in JPEG, you may want to lớn experiment with your cameras Auto Lighting Optimizer, Aulớn D-Lighting or whichever name your camera manufacturer gives this feature. It can be helpful but it is important to lớn know it’s limitations.