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- Raster
images are made up of pixels
- Our
computer monitors and TV's create images using pixels as well.
The inside of the glass is coated with phosphorus. The pixels
are in groups of three (Red, Green, and Blue). Electron guns light
up the pixels 60, 72, 75 or 85 times per second.
- Television
pixels are rectangular. Computer monitor pixels are round.
- PhotoShop
and other programs reproduce 16 million colors using a combination
of Red, Green, and Blue. There are 255 shades of each. This is
called
RGB
color mixing.
- If
you are working on a computer-based project, you should use RGB
sliders on the color palette.
- Web
pages and GIFs do not use all 16 million colors. Only 256 colors
are used? Why is that? This mode is called Indexed color mode.
When an image is saved as a GIF, the colors are shifted or dithered
to one of the web-safe colors.
- You
can see the difference on this file.
- Web
designers use HTML to make web pages. The 256 colors are encoded
using Hexadecimal values.
- Print
images (sunday comics, posters, books) and ink jet and laser printers
do not use RGB, they mix Cyan, Magenta, Yellow, and Black inks.
This is called
CMYK
mode. The paper is sent through four printers- one for each
color.
- If
you are working on a PRINT project in PhotoShop, you must use
the CMYK sliders on the color palette.
- Some
colors visible on your monitor are not printable. Some printed
colors will not appear on your screen. The range of colors reproduced
in a color mode is called the GAMUT.
Photoshop lets you know if a particular color is out-of-gamut
by showing an exclamation point. We won't have to worry about
this, but in professional printing and web design, it can make
a BIG difference.
- Colors
have many cultural meanings
associated with them. Even obscure
colors. Business spend thousands of dollars researching
and choosing colors for their logos and products, especially the
toy industry.
- Colors
can be complementary,
contrasting, analogous or Some colors go well together. A
color palette
is a set of colors that are visually pleasing together.
- Paint
companies like Behr, Dutch
Boy, and Benjamin Moore come up with creative and tasty names
for their colors, like "Pumpkin Pie", "Almond Paste"
and "Traffic Jam."
- Companies
are very particular about the colors of their logos. The town
of Hadley wanted Home
Depot to change the color of their sign to "clementine,"
which is one of the Historic
Colors of America. Home Depot refused to change it.
 
- You
can pick colors from an image in PhotoShop and save them in the
swatches to create your own palette. We'll be doing this for the
Navagation Bar assignment.
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