Author: rmichals (Page 5 of 9)

Guest Speaker

Thomas Holton

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

Midterm Critique

Global Corrections

Homework

Midterm Project

Field Trip to the Brooklyn Botanic Garden

Meet in the classroom in V111 at 2 pm or at 990 Washington Ave at the main entrance to the BBG at 3 pm.

Light and Dark

The word photography is rooted in Greek meaning “ writing with light “  One of the main concerns of photographers is how light illuminates a scene or subject. While we focus attention on light, it’s easy to not pay attention to shadows. Shadows, although dark, can be as dynamic as light. The shadows shape light, define texture, and act as compositional elements. 

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.

Shadows –  dark areas in photo that can range from black with no detail to dark tone with detail

Uses of light and shadow: Light and shadow are complementary elements in photography. The quality and direction of light affect how a subject looks while  producing shadows in various forms

1. Contrast and Drama :  Shadows can be used to create contrast to produce a dramatic effect. Attention of the viewer is drawn to tonal contrast which can not happen without shadows. In this interplay of light and shadow, the lighting effect is enhanced by the shadows.  

2. Shadows can be used to direct the viewer’s attention. Shadows can be be shapes that may be used as compositional elements  to direct attention to the center of interest in a photo. Also shadows can surround a light area to make it a center of interest.

3. Reveal form: Using shadows will give form to subjects and make them look more three dimensional. The shadows don’t necessarily need to be black for this to happen. As long as one part of subject is light and one part is darker the photo will look more three dimensional. For dramatic effect, direct light will produce dark shadows. But for some subjects, dark hard shadows can be distracting or cause loss of detail. For subjects where detail is important, using partially diffused light will make soft shadows that will show form and maintain detail. 

4. Reveal texture: Side light with shadow will show texture

5. Shadows can be shapes and patterns that can be used to complete a composition.

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How light falls on your subject is key to using shadows in photography. The best direction for a combination of light and shadow will be light coming from the side. For dramatic effect photograph when the light( direct light ) is at a lower angle which  will produce longer dramatic shadows. For less dramatic effect, use diffused light.

Exposing for photos that contain light and dark areas you will need to use exposure compensation. If there is large dark areas in the photo, the meter will over expose the light areas. In this case you need to use exposure compensation to lower the level of the lighter areas. 

Lab Exercises

Brooklyn Botanic Garden

Homework

Midterm Project

Quiz 1

Next week on Oct 19th, there will be a quiz. Review the class topics pages for weeks 1-6.