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How to use Magic Wand effectively
SIGNS: Understanding Colour
► Output to PDF
► How to use CorelDraw
► Glossary of CorelDraw Terms
► Photoshop Tips and Tricks
► Scanning Images
► Printing Big Images
► Roll up Banner Stands
How to use Photoshop Magic Wand effectively
See also Signage Shop ► What's On Special this month ► NEW image Gallery
Go to Photoshop
Magic Wand Selections
If you need to select a complicated image that is sitting on a simple background, if
is often easier to select the background (using the Magic Wand) and then choose
Select>Inverse to get the subject.
The number of ink dots per inch (dpi) produced by all laser printers, including
imagesetters. Most desktop laser printers have a resolution of 600 dpi, and imagesetters
have a resolution of 1200 dpi or higher. To determine the appropriate resolution for
your image when printing to any laser printer, but especially to imagesetters, see
Ink jet printers produce a microscopic spray of ink, not actual dots; however, most ink
jet printers have an approximate resolution of 300 to 720 dpi. To determine your
printer's optimal resolution, check your printer documentation.
The number of printer dots or halftone cells per inch used to print grayscale images or
color separations. Also known as screen ruling or line screen, screen frequency is
measured in lines per inch (lpi)--or lines of cells per inch in a halftone screen.
The relationship between image resolution and screen frequency determines the quality
of detail in the printed image. To produce a halftone image of the highest quality, you
generally use an image resolution that is from 1.5 to at most 2 times the screen
frequency. But with some images and output devices, a lower resolution can produce good
results. To determine your printer's screen frequency, check your printer documentation
or consult your service provider.
The digital size of an image, measured in kilobytes (K), megabytes (MB), or gigabytes
(GB). File size is proportional to the pixel dimensions of the image. Images with more
pixels may produce more detail at a given printed size, but they require more disk
space to store and may be slower to edit and print. For instance, a 1-by-1-inch, 200-ppi
image contains four times as many pixels as a 1-by-1-inch, 100-ppi image and so has four
times the file size. Image resolution thus becomes a compromise between image quality
(capturing all the data you need) and file size.
Another factor that affects file size is file format--due to varying compression methods
used by GIF, JPEG, and PNG file formats, file sizes can vary considerably for the same
pixel dimensions. Similarly, color bit-depth and the number of layers and channels in an
image affect file size.
Photoshop supports a maximum file size of 2 GB and maximum pixel dimensions of 30,000 by
30,000 pixels per image. This restriction places limits on the print size and
resolution available to an image.
SOURCE: PHOTOSHOP HELP FILES
GO TO DO IT YOURSELF LETTERING
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