Automatic Exposure Mode is a great way to become familiar with Halide's powerful gestures and shortcuts. By default, Halide starts in Automatic Exposure mode. You can tell by this icon in the Quick Bar:
Let's say you pulled out your iPhone to take a photo of a dog:
Notice that the fur on her left side is a little underexposed. How do we bright it up?
Just like the built in iPhone camera app, you can by tap on the screen to choose a Point of Interest. Let's tap on the shadow to make it brighter.
Brackets appear to confirm your selection. It made the whole image brighter, and that area in shadow is better exposed.
In automatic mode, Halide will continually monitor this Point of Interest, and adjust exposure automatically.
Let's say you're shooting a portrait outside, on a partly cloudy day. As clouds move, covering the sun, the light changes. In this case, just tap on your subject's face, and Halide will ensure everything is exposed correctly.
This point of interest automatically disappears if the subject significantly changes.
Slide to Adjust Bias (EV)
Did you notice how in that photo above that part of the image is way too bright, blowing out the highlights in the fur? Auto-exposure isn't magic. Sometimes you need to fine-tune its decisions.
Take this image:
You might want this just a little brighter. Tapping on different spots of the image until you find the right exposure can be a guessing game.
If you need to make small adjustments to exposure, just slide up and down in the viewfinder to adjust exposure. Here we've slid it up just a little:
When sliding to adjust, the EV value temporarily lights up, and a yellow slider appears on the right side of the screen.
We nudged it up to +0.3. It's subtle, but notice how the wall in the background is now brighter?
Putting It All Together
Whenever I'm shooting, the first thing I do is tap to set a Point of Interest. If it's a person, I'll tap on their face. Then I'll take make minor adjustments by sliding to adjust.
As you use Halide more, these gestures become muscle memory. This is great news, because they're identical when in manual exposure mode.