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--- playground:exposure_to_the_right_ettr [2014/01/25 10:10] – created mgrant
+++ playground:exposure_to_the_right_ettr [2014/01/25 12:17] – mgrant
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-====== Exposure to the right (ETTR) ======
+====== Auto Exposure to the right (ETTR) ======
-Exposure to the right (ETTR) is a technique of setting the exposure of a scene such that few or no pixels are are over exposed (blown out) thus maximizing the information captured without loosing information to over-exposure.  This may produce a darker image but this can be corrected later in post processing.  The exposure curve is thus as far to the right as possible without it being clipped.
+Automatic Exposure to the Right (ETTR or AETTR) is a technique of setting the exposure of a scene such that few or no pixels are are over exposed (blown out) thus maximizing the information captured without loosing information to over-exposure.  This may produce a darker image but this can be corrected later in post processing.  The exposure curve is thus as far to the right as possible without it being clipped.
 For more information on ETTR, see these articles on Luminous Landscape:
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 The first method involves taking 2 images.  A photo is taken then ETTR looks at it and it modifies the exposure for the next photo.  There are two ways to use this method: **Always on** and **Auto snap**.  The Always on setting sets the ETTR for the next photo on //every photo// you take for the next photo.  The Auto snap setting takes a photo, calculates the ETTR, and then if necessary takes the second photo immediately.
-The second method uses the live view momentarily to run through a series of exposures until the exposure is correct without taking a photo.  You then take the photo.
+The second method uses the live view momentarily without taking a photo.  You then take the photo.
 ETTR sets the shutter speed and ISO.  It does not change the aperture setting thus not altering the depth of field of the scene.
+====== The Settings ======
 In the Expo Tab (Exposure Menu of ML) you will find Auto ETTR:
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 Pressing the **Q** button brings you to the settings menu of the ETTR function
-==== The Settings ====
 {{:playground:aettr3.jpg|ETTR Info Screen}}
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 **Shadow SNR limit**: 2  Is defined in EV levels of noise form 1 to 4 EV.  The higher the SNR the less noise.  Typical settings from 2 to 4 EV.  For a Timelapse we recommend 2 or 3.
-==== The Advanced settings ====
+====== The Advanced settings ======
 {{:playground:aettr0.jpg|}}
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 **Show debug info**: ON OFF.  Will show some of the important calculation results of this module.
-==== Visual Feedback ====
+====== Visual Feedback ======
 If you want more visual feedback to see how the image is (and you will need it for **Always on** and **Auto snap**), enable histograms and raw zebras:
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 Also in the **Overlay Tab** you can scroll to **Zebras**, press **Q**, and make sure that **RAW zebras** are ON.   The **RAW zebras** will show on the image itself to mark the areas where a color channel may be overblown.
+{{:playground:aettr4.jpg|}}
+====== Step by step intructions ======
-===== Setting it up =====
 ETTR in RAW images  - HOW TO USE IT (step-by-step):