playground:playground
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playground:playground [2014/01/21 18:44] – mgrant | playground:playground [2014/01/22 09:41] – mgrant | ||
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====== Exposure to the right (ETTR) ====== | ====== 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. | + | 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. |
+ | |||
+ | For more information on ETTR, see these articles on Luminous Landscape: | ||
+ | * http:// | ||
+ | * http:// | ||
There are two methods (three really) of using ETTR: | There are two methods (three really) of using ETTR: | ||
- | The first method involves taking 2 images. | + | The first method involves taking 2 images. |
The second method uses the live view momentarily to run through a series of exposures until the exposure is correct without taking a photo. | The second method uses the live view momentarily to run through a series of exposures until the exposure is correct without taking a photo. | ||
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{{: | {{: | ||
- | Pressing the Q button brings you to the settings menu of the ETTR function: | + | Pressing the **Q** button brings you to the settings menu of the ETTR function: |
{{: | {{: | ||
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**Trigger mode**: Always ON, Auto Snap, Press SET, HalfS DblClick. | **Trigger mode**: Always ON, Auto Snap, Press SET, HalfS DblClick. | ||
- | | + | * **Always on** means that every time you take a picture the image is displayed in the LCD monitor with an analysis of the image and the shutter speed and ISO are set for the next photo. |
- | | + | * **Auto |
- | | + | * **Press SET** means that every time press the SET button the current scene is displayed in live view, the image is analyzed by stepping through a series |
- | | + | * **HalfS DblClick** |
- | | + | For Timelapse set it to **Always on**. |
+ | |||
+ | With **Always on** and **Auto snap**, you should definitely enable Zebras and Histogram to see if the settings it choose are correct. | ||
**Slowest shutter**: 1/60 The slowest shutter that will allow for the current scene. . For a night time lapse set it to 30 seconds. | **Slowest shutter**: 1/60 The slowest shutter that will allow for the current scene. . For a night time lapse set it to 30 seconds. | ||
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==== The Advanced settings ==== | ==== The Advanced settings ==== | ||
- | **tbd** | + | **Exposure Target**: A general exposure target for the scene, |
+ | |||
+ | **Link to Canon shutter**: | ||
+ | |||
+ | **Link to DUAL ISO**: ON or OFF. In ON position the camera will analyze the scene via Trigger mode (4) and decide if DUAL ISO is required or not. Requires the DUAL ISO module to be enabled. | ||
+ | |||
+ | Note: If Link to DUAL ISO is set to OFF, the module will not calculate the required DUAL ISO and the image will only be set to meet the ETTR requirements. | ||
+ | |||
+ | **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 | + | If you want more visual feedback to see how the image is (and you will need it for **Always |
- | In the Overlay Tab you can scroll down to Histogram and press Q to configure: | + | In the **Overlay Tab**, first make sure **Global Draw** is: **On, all modes**. |
+ | |||
+ | Then in the **Overlay Tab** you scroll down to **Histogram** and press **Q** to configure: | ||
RAW EV indicator: OFF Here you can press the set button and select ETTR hint. This will display in the RAW histogram a hint of how many more EVs you can expose to meet the ETTR parameters set in previous menu. | RAW EV indicator: OFF Here you can press the set button and select ETTR hint. This will display in the RAW histogram a hint of how many more EVs you can expose to meet the ETTR parameters set in previous menu. | ||
- | 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. | + | 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. |
- | --------------------- | ||
- | ===== Usage ===== | + | |
+ | ===== Setting it up ===== | ||
ETTR in RAW images | ETTR in RAW images | ||
- | If you do not have ML installed in your camera go here: | + | 1. Go to Canon Menu and set Image Review: hold (This gives you a change to review the RAW histogram until you press half shutter to stop the preview, 2 sec is too quick to analyze the histogram but you can set it as desired NO LESS THAN 2 SEC! |
- | RAW video & ML -- Beginners Guide and FAQ -- READ FIRST | + | |
- | http:// | + | |
- | 1. Go to Canon Menu a set Image Review: hold (This gives you a change to review the RAW histogram until you press half shutter to stop the preview, 2 sec is too quick to analyze the histogram but you can set it as desired NO LESS THAN 2 SEC! | + | 2. Put the camera in manual M mode or Av mode (either one since you must the aperture yourself), and set ISO to any number except in Auto. It wont work in auto! |
- | + | ||
- | 2. Put the camera in manual M mode or Av mode (it makes no difference | + | |
3. Press trash button to enter ML menu. | 3. Press trash button to enter ML menu. | ||
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4. Go to the Expo Tab and enable Auto ETTR by pressing set. | 4. Go to the Expo Tab and enable Auto ETTR by pressing set. | ||
- | 5. Press Q if you want to change ETTR details. | + | 5. Press **Q** if you want to change ETTR details. |
6. (optional) enable Global Draw | 6. (optional) enable Global Draw | ||
- | 6.1 Press Q and move to Overlay Tab. Make sure Global Draw in: On, all modes. | + | 6.1 Press **Q** and move to Overlay Tab. Make sure Global Draw in: On, all modes. |
7. (optional) enable Zebras | 7. (optional) enable Zebras | ||
- | 7.1 Scroll to Zebras, press Q, scroll to the bottom and select Use RAW zebras ON. | + | 7.1 Scroll to Zebras, press **Q**, scroll to the bottom and select Use RAW zebras ON. |
- | 7.2 Press Q | + | 7.2 Press **Q** |
8. (optional) enable the Histogram | 8. (optional) enable the Histogram | ||
- | 8.1 Scroll to Histogram and press Q | + | 8.1 Scroll to Histogram and press **Q** |
8.2. (optional) Scroll to RAW EV indicator and select ETTR hint by pressing set. | 8.2. (optional) Scroll to RAW EV indicator and select ETTR hint by pressing set. | ||
- | 8.3. Press Q | + | 8.3. Press **Q** |
12. Press trash button to exit ML menu. | 12. Press trash button to exit ML menu. | ||
- | 13. Frame you subject and set the aperture and shoot a test photo. | + | ===== Usage ===== |
- | 14. Now look at the display | + | You are highly recommended to use a tri-pod or other support. |
- | The new important features that you are looking in the display are: | + | ==== Always On mode ==== |
- | RAW histogram on the bottom right is a small graph. | + | 1. Frame you subject and set the aperture (for the DOF) and shoot a test photo. |
- | a. Inside this histogram | + | 2. Now look at the display and you should |
- | b. Inside | + | |
- | c. If there are overexposed areas you will see RAW Zebras | + | |
- | 13. Take another picture without changing the scene and you will see how the camera settings are adjusted to meet the ETTR requirements. | + | 3. Shoot another a photo and repeat to step 2 until your photo is not over exposed (few or no zebra lines, and the exposure curve up to the right side of the graph). |
+ | |||
+ | ==== Auto snap mode ==== | ||
+ | |||
+ | 1. Frame you subject and set the aperture (for the DOF). | ||
+ | |||
+ | 2. Press the shutter. | ||
+ | |||
+ | 3. Now look at the display and you should see the second image with the histogram and the zebras in the over exposed areas (if you enabled them). | ||
+ | |||
+ | ==== Press Set and HalfS DblClick modes ==== | ||
+ | |||
+ | 1. Frame you subject and set the aperture (for the DOF). | ||
+ | |||
+ | 2. Press the Set button or quickly half-press the shutter release twice depending on the mode. | ||
+ | |||
+ | 3. The camera will go into live view mode and will step through a series of exposures trying to find the proper exposure for the scene and then the camera will go out of live view mode. | ||
+ | |||
+ | 4. Do not recompose your shot. Shoot the scene. | ||
+ | |||
+ | ==== Using the histogram ==== | ||
+ | |||
+ | Inside this histogram you may see near the top-left of the graph, in white lettering, the letter E followed by a number which represents how far you can go, in EV numbers, to reach ETTR, i.e E1.2 | ||
+ | |||
+ | Inside the RAW histogram near the bottom you may see colored circles with numbers inside which represent the overblown channels (R, G, B) and the number of EV of over-exposure. | ||
+ | |||
+ | If there are overexposed areas you will see RAW Zebras in the color which is overblown. | ||
+ | |||
+ | Take another picture without changing the scene and you will see how the camera settings are adjusted to meet the ETTR requirements. | ||
If the camera beeps it means that the photo is out of specs and you should shoot again. | If the camera beeps it means that the photo is out of specs and you should shoot again. | ||
+ | |||
+ | ===== Convergence to results ===== | ||
+ | |||
+ | With the **Always on** and **Auto snap** setting which takes images, it may require at least two images (sometimes three or four) to come up with the proper exposure. | ||
+ | |||
+ | When the algorithm cannot find an adequate exposure it will beep twice and give you a message in the LCD screen. ETTR: expo limits reached, indicating the ISO and speed limits used. | ||
+ | |||
+ | When the algorithm finds an adequate exposure it will beep once and give you a message in the LCD screen. ETTR settled at ISO xxx and the shutter speed. | ||
+ | Note: the image review time in the LCD is set via Canon menu in Image Review. | ||
+ | |||
+ | ===== Raw histogram use ===== | ||
+ | |||
+ | It is best to enable RAW Histograms via Global draw. This will put a little histogram on the LCD during image review. | ||
+ | |||
+ | If you also enabled RAW zebras via Global draw, you will also see, if any, areas of the image are over-exposed. | ||
+ | |||
+ | ===== References ===== | ||
+ | |||
+ | * http:// | ||
+ | * http:// | ||
+ | * http:// |
playground/playground.txt · Last modified: 2022/05/13 16:55 by WBOX4