PHOTOSHOP – 1/28/14 03/13/2014
• Created by Thomas Knoll in 1987; acquired by Adobe in 1988.
• Is the industry standard for graphic/image manipulation software; GIMP is growing in standard because
it is free.
Takes many of its tool names and metaphors from oldfashioned darkroom photography (i.e. dodge,
burn, crop )
Mostly uses raster (or bitmap) graphics; images are made up ofpixels
Vector Images Raster Images
Made up of points and paths Made up of tiny dots (aka pixels)
Form shapes are filled with color Each pixel stores color info
Resolution based on math equations Resolution based on pixels per inch (ppi)
Can be scaled infinitely without quality loss Information is lost when scaled up (resulting in
File sizes are small File sizes are large
Can easily convert to raster Converts to vector with difficulty
Great for logos/illustrations Great for photography, web design
File Types: EPS, WMF, AI, CDR, DXF, SVG, PLT File Types: BMP, PCX, TIFF, JPEG, GIF, PNG, PSD,
PPI (pixels per inch) refers to an image’s resolution.
for anything on screen: 72 pixels/inch
in one inch of space, there will be 72 pixels
for paper: 300 pixels per inch
in one inch of space, there will 300 pixels
Graphics with higher resolution have more pixel density hence better quality.
NOTE: Document/Canvas size specifies the height and width of an image – not the
image’s resolution. WHY IS RESOLUTION HIGHER FOR PAPER?
our eyes are