Author: rmichals (Page 5 of 8)

Terms

Aspect Ratio-the proportion of the width of the image to the height of a 2D image

Clipping-the intensity of the light falls outside of what can be recorded by the camera and there is a loss of detail.

Exif Data-information stored by the camera in the file.

Gamut-range of colors

Histogram- a graphic representation of the tones in an image. A spike of data on the left side indicates underexposure, on the right overexposure.

Non-destructive Editing-adjust the image without overwriting the original image data. Instructions are written to a sidecar file that tells the software how to interpret the image.

White Balance-the setting that adjusts for the color temperature of the light and that will make a white object appear white or a gray object a neutral value

Global Corrections

Global corrections adjust the entire file. In the Lightroom CC, it includes the controls under Light, Color and Effects. In Lightroom classic, this includes everything in the basic panel: White balance, Tone and Presence.

Using the Histogram

The histogram is a graphic representation of the tones in the photograph. It is a guide to exposure decisions. Most images look best when there is a full range of tones from black to white in the image. But there are no iron clad rules.

To access the histogram in Lightroom, from the keyboard select: Command 0

Or get it from the three dots on the right menu bar.

From the top of the histogram, there is a triangular button on both the left and right. Toggle it to turn on/off show clipping of the shadows on the left and the highlights on the right.

To maximize the the tonal range, adjust a photo to have some tones that are totally black and totally white but only a few so that you don’t lose detail in either the shadows or the highlights.

Another way to toggle between before and after besides the button at the bottom of the interface is the backslash key.

Looking at the histogram, we can see that there is not a true black or white. To raise the contrast of the image and use the full tonal range, use the following adjustments:

• Select show clipping on the top left of the histogram. Adjust the blacks slider to the left until you see bright blue flecks on your image.
• Select show clipping on the top right of the histogram. Adjust the whites slider to the right until you see bright red flecks on your image.

Most images improve with:

• shadows slider to +50 add detail to the dark areas
• the highlights slider brought to the left to bring detail into the highlights.
  

In this photo of the pier in Coney Island, the histogram shows that is underexposed. But we also know that it is an evening scene and that there is nothing in the photo that should be bright white.

Lightroom Workflow:

1. Optics: enable lens correction. If there is architecture or a strong horizon line, geometry>upright>auto
   
2. Crop.
   
3. Light
   a. Exposure slider-use to adjust the overall tonality
   b. Set black point using show clipping
   c. Set white point using show clipping
   d. Use shadows slider to brighten mid tones.
4. Color or white Balance
   
5. Effects – Adjust clarity (mid tone contrast)
   
6. App: color – Adjust vibrance and or saturation
   
7. Detail panel – Sharpen-amount at least 50
   

Lightroom Classic Resource

A few tips for Lightroom Mobile:

1. To access the histogram, tap on the image with two fingers. If you can’t really see the histogram background, brighten the display.
2. To see the image before your corrections, press on the image.

Lab Exercises

Global Corrections

Homework

Midterm Project

Bees

Photo credits: Top, left to right: Tina Gunasekera, Julian Georgi, Jabez Brisueno

Bottom: Fawziah Akhter, Brianna Brand, Alan Castillo

Light Quality

Light is either direct or diffused.

Direct light: the light strikes the subject from one angle and creates sharp shadows. Sunlight is an example of direct light.

Diffused Light: the light hits the subject from many angles and creates soft shadows. The light is diffused on an overcast day or in the shade.

Photo credits: Left-Joel Barbeco, right-Alan Castillo

Measuring the Amount of Light

Exposure is the amount of light that comes into the camera to create the photograph.

Exposure is made up of three components:

1. ISO-Sensitivity to light.
2. Shutter Speed-the length of time that the camera’s shutter is open during the exposure.
3. Aperture-how wide the cameras lens opens to allow the light to come in.
   

All three are measured in stops. Each full stop of light represents that the amount of light has doubled or reduced by 1/2.

How your Camera Meter Works

Acronym: TTL – Through the Lens

The meter in your camera is a reflected-light meter.

A reflected light meter averages the tones in the scene and selects the aperture and shutter speed values that will make the whole scene medium gray.

Watch from :45 to 1:34 for an explanation of how your camera meter works.

Challenges

There are certain predictable situations that will fool your meter.

1. Backlight – a common example is a person against a window or against the sky. Add exposure to get the right exposure for the main subject and allow the background to be overexposed.

2. Landscapes with sky. The sky is brighter than the ground and to get a good exposure of the land portion of your photo, often you need to over expose the sky.

3. Snow

How to control exposure

With a camera: Use Exposure Compensation set to plus to increase the light and set to minus to decrease the light.

Exposure Compensation-a way to force the camera to make an exposure either lighter or darker than the meter reading. Good for backlight or extremes of light and dark.

With a cameraphone: Touch the area where the main subject is and then drag the little sun icon up or down to increase or decrease the overall exposure.

Using Exposure for Creative Effect

Sometimes, you don’t want the tones in your image to average out to a medium gray. You want to tones to be low key-mostly dark or high key-mostly light.

Lab Exercises

Exposure and Meter Challenges

Homework Due Next Class

Midterm Project

Review for Quiz 1: Composition, shutter Speed, Motion Capture, Aperture, Depth of Field, Perspective, Exposure, How the Meter works, Exposure Challenges

Upcoming Schedule

October 4 – Quiz 1, Lightroom, Midterm Project Support

Oct 11 – Midterm Project Presentations

Oct 18 – Outdoor portraits-Brooklyn Bridge Park