This is because the colors of the filters in the Bayer array are not the same as the colors emitted by our screens. All three RGB values for each pixel in a digital image created using a CFA are interpolated from the raw monochromatic luminance values collected by the sensor. ![]() ( Note: Recover using the Exposure slider, not the Highlights or Whites sliders.)Ĭolor interpolation is still needed. I've done exactly this in the screenshot below. You will find significantly more recovery latitude in the file shot with HTP engaged. The two photos will appear identical-until you drag down the Exposure slider. Use the exact same exposure settings making sure to completely blow the images out. Take two RAW photos of your computer screen, one with Highlight Tone Priority off, the other with it on. It is easy to demonstrate this to yourself. What many users don't realize is that while Auto Lighting Optimizer doesn't affect RAW files, Highlight Tone Priority does. No other adjustments were made to either image. The image on the right, shot with Highlight Tone Priority engaged, shows how much more data is available to recover. The image on the left shows the typical dull whites you get when there is no data to recover. They looked identical before I applied a -3.75 adjustment to the Exposure slider to both images. Both CR3s were shot with the exact same settings. The screenshot below demonstrates what I have been describing. I don't have the time to monitor ISO and change this setting. But if I'm shooting street, things are happening quickly. If I'm shooting landscapes, for example, I have the time to turn the HTP feature on and off based on my ISO. I typically shoot in Manual mode with Auto ISO engaged. So do I always shoot with HTP engaged? Sadly, no. I've always assumed that this is the same high ISO shadow noise you'd notice with the feature turned off (shooting at the same ISO) but it's never been a problem so I've never bothered to do a comparison. The manual indicates that you may notice noise in the shadows. Is there a downside to always using HTP? Not that I'm aware of, aside from being locked out of lower ISOs. If you're shooting at ISO 800, it is typically because your shutter speed at ISO 100 is too slow. Some people argue that this is no different than shooting at ISO 100 and boosting the shadows. This is why the feature doesn't work at ISO 100 where there is no amplification happening. With Highlight Tone Priority engaged, the camera essentially tone maps the data, amplifying the darker tones but not the lighter tones when it records the image file. When you increase the ISO setting, the camera takes the data coming off the sensor, amplifies it, and writes the resulting data to the RAW or JPG file. How does the feature work? The actual sensitivity of your sensor is fixed at its native ISO. ( Note: Recover using the Exposure slider, not the Highlights or Whites sliders.) ![]() ![]() ![]() Click to expand.I appreciate your thoughts, entoman.
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