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With cameras, the camera tries to expose the image to match an 18% gray in the area of the viewfinder that is metered. Theoretically if you use, say, the spot meter, the camera will expose the image at that spot so that is represents an 18% gray. With centered and matrix metering, the same, except that the area averaged is larger.
Question…how can I take a portion of an image, lets say a 20px by 20px section of the image and adjust the levels so that the average gray for that area is 18%? First of all, how do you average the area (or better yet, how does the camera average the area) and secondly, how can you know that that area equals an 18% gray?
Dave Skidmore
Question…how can I take a portion of an image, lets say a 20px by 20px section of the image and adjust the levels so that the average gray for that area is 18%? First of all, how do you average the area (or better yet, how does the camera average the area) and secondly, how can you know that that area equals an 18% gray?
Dave Skidmore
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