Here are the CR2 files used in the above example. Noise does a good job of fooling our eyes into thinking there is more detail then there actually is. Especially when you consider as a1ex has shown above, you can actually over expose the green channel on most occasions and still retain detail in your highlights.Įdit: The ETTR shots can often look less sharp thanks to the reduction in noise.
RAWDIGGER GREEN RAW FULL
So once you have a full understanding of the benefits of ETTR, it's becomes easier to understand why accurate exposure information (histogram) in camera is so important.
As the color accuracy improves from luminance 30 through to luminance 70, it's only reasonable to assume that the color accuracy continues to improve through luminance 80, 90, 99, although there are no test results to back this assumption. As we go higher up in luminance that the camera captures (further to the right on the histogram), the color accuracy improves. And the white outline represents the range of colors that the camera actually reproduces. The black boxes represent what the color should look like.
RAWDIGGER GREEN RAW ISO
Set the ISO to 100 and the Luminance to 30. Take a look at the Full CS (Full Color Sensitivity) results for the 5D3 at DXO. The other reason to ETTR, is color accuracy. That's ISO 1600! Noise is basically non-existent all thanks to ETTR. (note: It's to early in the morning to do EV corrections, but it's within 0.3EV and close enough The noise is much better in a correctly exposed shotīelow is ISO 1600, f/10, 1/640. (note: I did my sums wrong and should have only increased by 0.15EV) This application is intended for use with digital cameras that are capable of capturing RAW images. A combination of the camera under exposing and having to increase EV in post.īelow is ISO 1600, f/10, 1/1600. In this particular exposure sequence using shaded sunlight the Red and Blue channel lagged about a stop behind in the values shown here for the green channel. In the RAW format, black starts at the value of 255. The noise is predictably poor in this shot. So, what exactly is the curve that is dumped when you use the Dump RAW Curve action in RawDigger Looking at the resulting CSV, input values of 1-4096 are mapped to values of 1-17,220 with the first 2000 values being linear. A few notes about the chart: The values and histogram are from the green raw channel, with 255 subtracted out.
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Each has only had chroma noise reduction and exposure adjustments.īelow is the shot as the camera exposed (ISO 1600, f/10, 1/4000) with 1.5EV (stop) increase in post. lookup promo green sa lancashire hoger good. Quite a difficult scene for evaluative metering, and with the center of the shot over the sky, the camera is going to under expose. Lets take this scene metered in evaluative metering at ISO 1600 to demonstrate the noise aspect. The 2 main reasons are noise and color accuracy. There is a thread over at POTN that is worth reading. Exciting times.įor anyone following and wondering what the hell ETTR (Exposure to the Right) is, and why bother.
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