Working With Images April 21, 2005 Why this workshop? To end the frustrating hours spent trying to print posters. To maximize the quality of your posters, manuscripts, PowerPoint presentations and web images. To inject some good information into the informal support network. Agenda
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April 21, 2005
… unless I ask a question
Draw a 1024 x 768 pixel rectangle and fill it with light yellow. Draw a 885 x 628 rectangle with no fill and a 6pt black stroke. This makes a 504K Illustrator file.
Make a 1024 x 768 pixel bitmap with a bunch of light yellow pixels and a few black pixels. This makes a 2.25MB image.
Bitmap Grayscale RGB CMYK
21 = 2 values
0 = black
1 = white
28 = 256 values
0 = Black
This gray is 119
224 = 16,777,216
8 bits for each channel (R,G & B)
This is 255, 153, 0
232 = 4,294,967,296
8 bits for each channel (C,M,Y & K)
This is 0,44,95,0
100 x 100 graphics!8/9s of original pixels discarded
300 x 300OriginalRaster GraphicsImage scaling
600 x 6003 new pixels created for each original pixel
Critical take-home point #2
It does not matter because they are both 500 x 350 pixels!
Enlargement illustrates what halftone would look like if this image was printed on the color laser writer or plotter.
Use these boxes when sizing for display
Use these boxes when sizing for printing
Turn Resample Image off when you want to change resolution without changing image size
Use Bicubic Smoother when upsampling and use Bicubic Sharper when downsampling
There be monsters here…
Nope. It’s 100110000001001111111111
Red, Green, Blue graphics!
Used by monitors and data projectors
Works by adding colors together (additive)
Red+Green+Blue = White
Cyan, Magenta, Yellow, Black
Used by printers
Works by absorbing color (subtractive)
Imperfections in ink absorption causes C+M+Y= muddy brown
Black (K) is added to fix the problemThe RGB vs. CMYK Complication
Set RGB working space to sRGB
Set RGB color management policy to “convert to working space”
Turn on “Ask when opening” and “Ask when pasting”
Illustrator color setting dialog box. Other applications have similar dialog boxes.
This used to be simple…