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
