Histograms Of A Digital Image

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Photo : Delores Randall New Orleans Man from my cousin Rich and Pam house.

Understanding the histogram chart that shows up your digital camera and Photoshop.  Understanding how to manipulate the digital image with your camera and within software gives you tons of control to make your photos pop!

A histogram shows the brightness values of all the pixels in the image. The height of each bar in a chart represents the number ofhistogram Histograms Of A Digital Image pixels of a particular brightness level that occurs anywhere in the image. In an 8-bit image, the histogram shows each of the 256 tones available for the picture. Black is 0, middle gray is 128, and white is 255.

A rich print uses most of the 256 tones, from the subtle tones of a white cloud to the deep shadows on the side of an house. Empty space on either end of an histogram means a digital images has no bright highlights or no dark shadows. It can be a scene with a very low contrast range or a scan made without correct settings for the white and black points.

Digital cameras display a histogram. The histogram of an image you take will tell you if your picture was over or underexposed, you can adjust your shooting for the digital image.

Scanning software and photo editing programs, a histograms guides your contrast and lighting adjustments. The software displays the histogram and you can redistribute the tones in the image according to the information presented in the box. Scanning software displays a histogram you can direct the scanner to capture the tonal range you need, and to adjust the tones within the range.

Normal contrast has pixels well distributed in shadows, highlights, and all the tones in between.

High contrast are clustered at either end, near pure black and white with very little gray in between.

Low contrast are bunched in the middle of the histogram with fewer pixels in the highlights and shadows.

A color photograph will have histograms that represent each channel separately, or a combination that will merge them. In the R,G, and B histograms, you can see a bump in the highlights from pixels. Knowing the distribution of colors can help you make better editing decisions about them.

A color photograph may be displayed as three histograms. With each one representing one of the three primary colors. The redExample 0001 histogram comparison Histograms Of A Digital Image brightness values of each pixel in full color image can be displayed as a separate monochromatic image in black and white or in color. Each of the components of a color image (four for a CMYK image) is called a channels.

Separate histograms display of each channel are helpful for scanning; they help you set individual black and white points and balance each color.

Color to Black and White: Grayscale or Desaturate. The simplest way to convert a color photograph to black and white is to select image>mode>grayscale. This will discard all the color information. The three channels are blended together, the color is removed, and the file shrinks to one-third of its former size.

A black and white image can still have color. Another step to convert your Image>Adjustments>Desaturate, keeps the image in the RGB mode but makes the three color value for each pixel the same, the result is an black and white image. The kind of monochromatic file in RGB can be further altered to add a subtle color to the image, it can look like sepia-tone antique that can be used to printed on cold toned silver paper. Image>Adjustments>Hue Saturation and check the colorize box. Move the Saturation slider to a lower number, then move the Hue slider to select the tone you want.

Photo : Delores Randall My baby brother’s daughter who is my niece.

Color to Black and White: Channels

Each color channel has a different black and white image. You can make different conversions to black and white from the same image. To see channels individually, choose Window>Channels. By looking at the image in each channel, red, green and blue, you may find black and white version that already looks close what you want for the final print. Converting to grayscale while only one chanel is selected eliminates the other two channels, strips it color but retains the contrast information. Combine the channels with Image>Adjustments>Black & White. Position the slider for the proportion of each channel or color you want to appear in the final image.

Note the three layers that make up every color photograph are easy to see when the image is displayed in Photoshop. An RGB image shows on the monitor in full color and visible in the Channel palette Windows>Channels. Each channel is a version of your picture made up in pixel value of one of the three primary color images. Photoshop gives you the option to display the channels in black and white or in the primary colors. Each channel is a monochromatic record of how much red, green, or blue light was recorded from the scene. You can view or edit each channel separately…..pretty cool stuff!

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Las Vegas digital image reflects the all three channels – RGB

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