playground:playground
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playground:playground [2014/01/21 18:44] – mgrant | playground:playground [2014/01/25 12:39] – mgrant | ||
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This is work in progress before it gets inserted into the main doc page. | This is work in progress before it gets inserted into the main doc page. | ||
- | * Exposure helpers: [[#Exposure to the right (ETTR)|ETTR]], | ||
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- | ====== Exposure to the right (ETTR) ====== | ||
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- | 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. | ||
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- | There are two methods (three really) of using ETTR: | ||
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- | The first method involves taking 2 images. | ||
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- | 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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- | ETTR sets the shutter speed and ISO. It does not change the aperture setting thus not altering the depth of field of the scene. | ||
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- | In the Expo Tab (Exposure Menu of ML) you will find Auto ETTR: | ||
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- | {{: | ||
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- | Pressing the Q button brings you to the settings menu of the ETTR function: | ||
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- | {{: | ||
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- | ==== The Settings ==== | ||
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- | **Trigger mode**: Always ON, Auto Snap, Press SET, HalfS DblClick. | ||
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- | **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 shot. | ||
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- | **Auto Snap** means that every time you take a picture the image is displayed in the LCD monitor with an analysis of the image, and that if the results are not adequate it will automatically take another image. | ||
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- | **Press SET** means that every time press the SET button the current scene is displayed in the LCD monitor with an analysis of the image. | ||
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- | **HalfS DblClick** | ||
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- | For Timelapse set it to **Always on**. | ||
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- | **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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- | **Highlight Ignore**: 0.2% Percentage of (highlight) pixels to ignore when calculating ETTR. This is used if you want to allow overexposure in the highlights, for example room lights. | ||
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- | **Midtone SNR limit**: 6 Is defined in EV levels of noise in the Midtones form 1 to 8 EV. The higher the SNR the less noise. | ||
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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. | ||
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- | ==== The Advanced settings ==== | ||
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- | **tbd** | ||
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- | ==== Visual Feedback ==== | ||
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- | If you want more visual feedback as to what's going on, enable histograms and raw zebras: | ||
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- | In the Overlay Tab you can scroll down to Histogram and press Q to configure: | ||
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- | 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. | ||
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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. | ||
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- | --------------------- | ||
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- | ===== Usage ===== | ||
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- | ETTR in RAW images | ||
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- | If you do not have ML installed in your camera go here: | ||
- | RAW video & ML -- Beginners Guide and FAQ -- READ FIRST | ||
- | http:// | ||
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- | 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! | ||
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- | 2. Put the camera in manual M mode or Av mode (it makes no difference since you must the aperture yourself), and set ISO to any number except in Auto. It wont work in auto! | ||
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- | 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. | ||
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- | 5. Press Q if you want to change ETTR details. | ||
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- | 6. (optional) enable Global Draw | ||
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- | 6.1 Press Q and move to Overlay Tab. Make sure Global Draw in: On, all modes. | ||
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- | 7. (optional) enable Zebras | ||
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- | 7.1 Scroll to Zebras, press Q, scroll to the bottom and select Use RAW zebras ON. | ||
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- | 7.2 Press Q | ||
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- | 8. (optional) enable the Histogram | ||
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- | 8.1 Scroll to Histogram and press Q | ||
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- | 8.2. (optional) Scroll to RAW EV indicator and select ETTR hint by pressing set. | ||
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- | 8.3. Press Q | ||
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- | 12. Press trash button to exit ML menu. | ||
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- | 13. Frame you subject and set the aperture and shoot a test photo. | ||
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- | 14. Now look at the display and you should see the image. | ||
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- | The new important features that you are looking in the display are: | ||
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- | RAW histogram on the bottom right is a small graph. | ||
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- | a. 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 | ||
- | b. 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. | ||
- | c. If there are overexposed areas you will see RAW Zebras in the color which is overblown. | ||
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- | 13. 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. |
playground/playground.txt · Last modified: 2022/05/13 16:55 by WBOX4