Category: Class Topics (Page 2 of 3)

Depth of Field

Depth of Field-The distance between the nearest and farthest points that appear in acceptably sharp focus in a photograph. Depth of field can be shallow or extensive. While the term includes the word depth, depth of field refers to focus.

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Shallow Depth of Field

Shallow depth of field is commonly used in portrait photography to separate the subject from the background and in food photography.

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Extensive Depth of Field

Extensive depth of field is often used in landscape photography and photojournalism.

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The depiction of space

Perspective-the representation of a 3-dimensional space on a 2-dimensional surface by converging lines, diminishing scale and/or atmospheric perspective.

Sometimes photos combine perspective and shallow depth of field.

How to control depth of field (with a camera)

These four factors control depth of field:

• lens aperture 
• focal length
• camera-to-subject distance
• sensor size.

Aperture

Aperture is the size of the opening that allows light to hit the camera’s sensor when the photograph is taken. 

1. Aperture values are expressed in numbers called f-stops. A smaller f-stop number means more light is coming into the camera and will create shallow depth of field. A larger f-stop number will let less light into the camera and create extensive depth of field.
2. The full stops for aperture are: F2, f28, f4, f5.6, f8, f11, f16, f22, f3

Focal Length  is the distance from where the light converges in the lens to the sensor. If it is a short distance then the lens is a wide angle lens and shows a lot of the scene. If it is a long distance, the lens is a telephoto lens and it magnifies the scene. Wide angle lenses create extensive depth of field while telephoto lenses create shallow depth of field.

Camera-to-subject distance is how far the subject is from the camera. If everything is far from the camera, it is easier to achieve extensive depth of field. If the main subject is very close to the camera and the background elements are far from the camera, it is easier to achieve shallow depth of field.

It is the small size of the sensor that makes cameraphones so good at achieving extensive depth of field. It is also the main reason it is so hard to get your cameraphone to achieve shallow depth of field.Sensor size-the smaller the sensor the easier it is to achieve extensive depth of field. Bigger sensors allow for shallow depth of field.

 Bokeh-Bokeh comes from the Japanese word boke (ボケ), which means “blur” or “haze”, or boke-aji, the “blur quality.” Bokeh is pronounced BOH-Kə or BOH-kay. 

 — From http://www.nikonusa.com/en/learn-and-explore/article/h0ndz86v/bokeh-for-beginners.html

Lab Exercises

Lab 8: Space and Focus

Homework

HW 6: Space and Focus

Critique Etiquette

1. Respect the presenter. Give them your full attention.
2. Ask questions about your colleague’s photography. This is not the time to ask questions about your personal concerns.
3. Start with the positive when you comment on your colleague’s works. Use the terms below that we have learned this semester.
4. Be generous. Offer your thoughts. Your opinion and judgements are important. Do not leave the work of giving feedback to the others in the class.
5. Conversely, please do not speak over your classmates.

Vocabulary

Framing: How the frame brings together the elements inside the rectangle juxtaposing them, creating relationships between them

Types of shots: how much information is in the frame

• a long shot
• a medium shot
• a close up
• an extreme close up.

Frame within a frame – use elements in the frame to enclose the main subject and draw attention to it. A frame within a frame can be a window or door or it can be items in the foreground such as branches.

Angle of View:  describes the camera position in relationship to the subject. The angle of view may be: 

• a worm’s-eye view
• a low-angle
• eye-level
• a high-angle
• a bird’s-eye or aerial or overhead view
• an oblique angle.

Rule of Thirds – Instead of placing the main subject in the center of the frame, divide the frame into thirds horizontally and vertically and place the main subject at one of these intersections.

Fill the Frame –  (get closer) – do not leave empty areas that do not add to the composition and plan to crop in later.

Diagonals – Sloping lines

Leading Lines – lines in the photograph that lead the eye to the main subject

Patterns – repeated elements. Break the pattern for visual interest

Figure to Ground -the relationship between the subject and the background sometimes described as negative and positive space.

Diffused light – light that comes from many directions and creates soft shadows

Direct light– light that come from one direction and creates hard shadows

Contrast: The measure of difference between bright areas (highlights) and dark areas (shadows) in a photo

High contrast : Large difference between highlights and shadows. Mostly lights and darks without many mid tones        

Low contrast :  Little difference between lights and darks. Mostly mid tones.

Frozen Motion-Motion is stopped and captured in the frame with a fast shutter speed.

Blurred motion-moving elements blur with a longer shutter speed.

The Decisive Moment: A term coined by Cartier Bresson- “the simultaneous recognition, in a fraction of a second, of the significance of an event as well as the precise organization of forms which gives that event its proper expression.”

CUNY Photo Challenge – deadline March 29th

Enter your best photo taken in the class to date.

Read the criteria of the judges and select the image you think best fits what they are looking for.

You will need to include a title, a brief description which could include the class and assignment and location.

Forward the submission email for 1 pt credit.

Homework

HW 5: Reflections

Quiz 1

Photos

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.

Color Profile-the data for a digital device, such as a printer or monitor, which describes its gamut, or range of colors. Used to match the gamut from one device to another.

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.

Neutral Value-RGB values are equal or gray

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. Toggle it to turn on/off show clipping.

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.

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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.

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Lightroom Workflow:

1. Optics: enable lens correction. If there is architecture or a strong horizon line, geometry>upright>auto
   
2. Crop.
   
3. Color. Adjust the white balance if necessary.
   
4. 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.
   
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

Review:

Lighting Quality

Diffused– light hits the subject from all directions and the shadows are soft

Direct– light hits the subject from one angle and the shadows are crisp with sharp edges

Lighting Direction

Front light – light comes from near the camera position.

Side light – light come from 90 degrees to the camera position.

Back light – light comes from behind the subject and aims towards the camera.

Contrast

Contrast: The measure of difference between bright areas (highlights) and dark areas (shadows) in a photo

High contrast : Large difference between highlights and shadows. Mostly lights and darks without many mid tones  

Low contrast :  Little difference between lights and darks. Mostly mid tones.              

Inspiration

View:

http://filippodrudi.com/project-thefork.html

Other terms to know

Ambient Light-The light that is already there sometimes called available light

Continuous Lights-Always on, may be incandescent, halogen, fluorescent, LED

Strobe Lights – lights that fire when the exposure is made

Strobes have two bulbs:

• the modeling light which helps you see where the light will fall
• the flash bulb that fires when you press the shutter release

A trigger on the camera uses radio waves to tell the receiver to fire the light. The power pack stores the power used to make the exposure.

Modifiers

In studio photography, we put modifiers on the flash heads to change the quality of the lights. Two basic categories of modifiers are:

1. Softboxes- these spread and diffuse the light. The light hits the subject from many directions making the shadows softer.
2. Grids – these concentrate and focus the light. The light hits the subject from one direction making the light harsher and the shadows sharper.

Quiz Questions

• Identify lighting direction in a photograph: front, side, back
• Identify light contrast: high or low

Lab Exercises

Stuffed Animals

Midterm Project

Midterm Project

Next Week

Quiz 1: There will be three technical questions and one compare and contrast paragraph.

Topics for the technical questions are shutter speed, tripod use, lighting quality and direction, studio basics such as the difference between continuous lights and strobe lights.

The compare and contrast paragraph will give credit for use of the following terms: the rule of thirds, symmetry, diagonals, angle of view (bird’s eye or aerial view, high angle, eye level, low angle, worm’s eye view,) contrast of light and dark, frame within a frame, figure to ground, leading lines, pattern, Lighting quality: diffused or direct, lighting direction: front, side, back.

Light Quality

Direct light or hard light – the rays of light are nearly parallel and strike the subject from one direction creating hard edged dark shadows with little detail.
Examples: a spotlight, sun on a clear day, or a bare flash

Diffused light or soft light– the rays of light are scattered and coming from many directions. It appears even and produces indistinct shadows. Examples: overcast daylight, a light covered with tracing paper or other translucent material.

Direct Light and Direction

Front light comes from in front of subject from the camera position and the shadows fall behind the subject not concealing any details.

Side Light comes from 90 degrees to the camera. it adds dimension and texture to the subject.

Backlight comes from behind the subject towards the camera.

Inspiration

Labs

Lighting Direction

Homework

Midterm Project

Next Week

We will be going on a field trip to Lower Manhattan during class. We will take the A train. You will need train fare to go Lower Manhattan and come back to the classroom.

Be prepared to be outside and to walk. right now the forecast is for 50 degrees and sunny. That can change. We will also spend some time indoors the Oculus and Brookfield Place.

Approximate timing:

12-12:30 Review homework and Aperture

12:30-1 Travel to Fulton

1-2 Shoot

2-2:30 Return to class

2:30-3:20 Download and review photos taken on field trip, review for quiz on March 9th