chapter4 (d)

continuous tone

a smooth transition from shadows to midtones to highlights

black and whit points have

a substantial effect on the contrast

in order to create continuous tone illusion

a sufficient number of grays must be available per pixels so that the eye perceives smooth transition between tones

adjustment layers

are adjustment you make that exist as layer on the layers panel

adjustments

are operations you do that affect the appearance go an image such as manipulating the brightness and contrast

shadows

are the darkest areas represented by pixels in the low third of the grayscale

highlights

are the lightest are of the image and are represented by pixels whose value falls in the upper third of the grayscale range

why RGB Chanels called composite ?

because it is the results of combining the R ,G B channels

why do you set the readouts on the info panel to RGB if you are sampling a pixel in grayscale image?

because the RGB readouts identify pixel values in grayscale from0 -255

pixels with a grayscale vale of 0 are

black

what are 3 common adjustment for improving the overall appearance of an image

brightness/contrast , level , color balance

how can you the color yellow

by removing the color blue

how can you get the color mangeta

by removing the color green

how can you get the color cyan

by removing the color red

histogram

is a visual reference of every pixel in the image or in a selection if only one part of the image is selected

brightness

is defined by pixel's grayscale vale:the higher number , the brighter the pixel

contrast

is represented by the relationship between the highlights and shadows

what does color balance mean

it is an adjustment that allows you to control the balance of : red and blue and green in an image

the black point in histogram

it is represented by the black triangle

white point in histogram

it is represented by the white triangle

what does the start uses

it is uses a gradient to identify the shadows midtowns and highlights areas of the grayscale image

what happens when you press ctrl and j

it will duplicate a layer quickly

how many shades are available in RGB

256 shades : green and blue and red

high saturation

vibrant color such as red or tomato like

pixels with a grayscale value of 255 are

white

the grayscale range it in between

0 and 255

what are RGB channels called

composite

what does the CMYK stands for

cyan magenta and yellow

midpoint

defines which areas of the image fall into the middle range of the available grayscale

you can make adjustments

directly to pixels on a layer, but you can't go back and re-adjust at later time

What does a monitor do?

display colour with light example is TV

reduced saturation

dull red

uses of color adjustment

example is if the image was too red you can use the color adjustment to remove the redness

midtones

fall into the middle range of grayscale

any number between 0 and 255 is

gray

first step I n analyzing the appearance of any image is to identify

highlights and midtowns, and shadows

sampling

identifying pixel information on the info panel

gray scale

image is a digital in which pixels can be one and only one of 256 shades of gray

adjusting the tonal range of an image is like

knowing which fork to use in fine dining

pixels with a grayscale value of 128 is

middle point in the gray scale range which is pure gray

what is the adjustment layer called

non-destructive because it exists as a layer on the layers panel and allow you to apply adjustment to images without directly affecting the artwork

with the 256 shades of gray available per pixels the illusion

of a continuous tone image can be created

adjustment

operations to improve characteristics of the image like their color and their contrast and their overall effect

what are the additive primary colors?

red, green, blue

stair stepping

refers to the idea that you can see each step in the transition from black to white

white point

representing the brightest pixel in the image

black point

representing the darkest point in the image

what happens when the image is saved in Grayscale mode

that one of 256 shades of gray is available per pixels

what does vibrance refer to

the intensity of color

what does saturation stands for

the measurements of pixel's vibrance

what happens if you sampled pixels using grayscale setting on. the info panel

the readouts would identify pixels in ink percentage

how is the color purple and oranges and limes and yellows created?

there created by mixing varying strength and combinations of red and blue and green

once adjustment layers created

they affect the image but they can be mainpulated at a later time

what happens when you set the ragouts on the info panel to RGB

they indicate the grayscale value of pixels from 0-255