playground:exposure_to_the_right_ettr
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
playground:exposure_to_the_right_ettr [2014/01/25 10:12] – mgrant | playground:exposure_to_the_right_ettr [2014/01/25 12:23] (current) – mgrant | ||
---|---|---|---|
Line 1: | Line 1: | ||
- | ====== 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. | + | Automatic |
For more information on ETTR, see these articles on Luminous Landscape: | For more information on ETTR, see these articles on Luminous Landscape: | ||
Line 11: | Line 11: | ||
The first method involves taking 2 images. | The first method involves taking 2 images. | ||
- | The second method uses the live view momentarily | + | The second method uses the live view momentarily without taking a 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. | 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 ==== | + | ====== The Settings |
In the Expo Tab (Exposure Menu of ML) you will find Auto ETTR: | In the Expo Tab (Exposure Menu of ML) you will find Auto ETTR: | ||
Line 47: | Line 47: | ||
**Shadow SNR limit**: 2 Is defined in EV levels of noise form 1 to 4 EV. The higher the SNR the less noise. | **Shadow SNR limit**: 2 Is defined in EV levels of noise form 1 to 4 EV. The higher the SNR the less noise. | ||
- | ==== The Advanced settings ==== | + | ====== The Advanced settings |
{{: | {{: | ||
Line 61: | Line 61: | ||
**Show debug info**: ON OFF. Will show some of the important calculation results of this module. | **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: | 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: | ||
Line 73: | Line 73: | ||
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. | ||
- | + | ====== Step by step intructions ====== | |
- | + | ||
- | ===== Setting it up ===== | + | |
ETTR in RAW images | ETTR in RAW images | ||
Line 109: | Line 107: | ||
12. Press trash button to exit ML menu. | 12. Press trash button to exit ML menu. | ||
- | ===== Usage ===== | + | ====== Usage ====== |
You are highly recommended to use a tri-pod or other support. | You are highly recommended to use a tri-pod or other support. | ||
- | ==== Always On mode ==== | + | ===== Always On mode ===== |
1. Frame you subject and set the aperture (for the DOF) and shoot a test photo. | 1. Frame you subject and set the aperture (for the DOF) and shoot a test photo. | ||
Line 121: | Line 119: | ||
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). | 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 ==== | + | ===== Auto snap mode ===== |
1. Frame you subject and set the aperture (for the DOF). | 1. Frame you subject and set the aperture (for the DOF). | ||
Line 129: | Line 127: | ||
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). | 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 ==== | + | ===== Press Set and HalfS DblClick modes ===== |
1. Frame you subject and set the aperture (for the DOF). | 1. Frame you subject and set the aperture (for the DOF). | ||
Line 139: | Line 137: | ||
4. Do not recompose your shot. Shoot the scene. | 4. Do not recompose your shot. Shoot the scene. | ||
- | ==== Using the histogram ==== | + | ===== 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 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. | 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. | If there are overexposed areas you will see RAW Zebras in the color which is overblown. | ||
Line 150: | Line 150: | ||
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 ===== | + | ====== 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. | 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. | ||
Line 158: | Line 158: | ||
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. | 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. | 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 ===== | ===== References ===== |
playground/exposure_to_the_right_ettr.1390641146.txt.gz · Last modified: 2014/01/25 10:12 by mgrant