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density
The higher the density of an image, the greater the
opacity. The lower the density, the more transparent the image is.
dither
The mixing of adjacent pixels to simulate additional
colors to fill the gaps between two colors. For instance, if you want
to display a full color graphic on a 256-color monitor, the computer
will simulate the colors he cannot display. If there is a part in an
image that displays incorrectly because a red and a yellow pixel are
lying next to each other, creating a definite line from a distance,
dithering would put an orange pixel in between to smooth out the line
and the colors.
device dependant
color space
A color space where the same color will display differently
on different devices. Scanner RGB and display RGB, for example, will
display the same color value differently.
dodge
To bleach (lighten) a part or the whole of an
image.
DPI (dots per inch)
DPI is the number of dots (or pixels - PPI) that fit
horizontally and vertically into a one-inch measure. The more dots per
inch, the more detail is captured and the sharper the image.
drop shadow
Similar to a cast shadow but without added perspective
to create the illusion of a third dimension.
Also see cast shadow.
dummy
A dummy counts as an example of a piece of design work
(brochure, ad, book cover etc.) that needs to be approved by the client.
Once the client approves the dummy, the designer creates and prints
the final design.
duotone
Duotones are made by printing an image with two colors,
usually black and a second color. The resulting image has more depth
than it would have had with only a monotone color (mostly black ink
on white paper).
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