Eng. Soraya Elsayed Ahmed
Photoshop • Photoshop is a graphic editing program developed and published by Adobe Systems. • Adobe products : – Photoshop, Illustrator, and InDesign. – After Effects And Priemere – Dreamwaver – Flash Builder
Photoshop History •1987 •1990 •2002 •2003 •2005 •2007 •2008 •2010
Thomas Knoll Adobe Adobe Adobe Adobe Adobe Adobe Adobe
Display Photoshop 1 Photoshop 7 Cs (8) Cs2(9) Cs3(10) Cs4(11) Cs5(12)
Grayscale images
• Computer graphics can be classified into two distinct categories: raster graphics and vector graphics. It is simple to convert from vector graphics to raster graphics, but going the other way is harder.
Two Kinds of Computer Graphics Raster
Vector
Composed of pixels
Composed of paths
Become pointy as it is scaled up
Remains smooth at any size
partially overcome with the use of "antialiasing Require higher resolutions
much brighter
Two Kinds of Color RGB
CMYK
Use light to display color
Use printing inks.
Use RGB For Screen Displays
CMYK For Print
Display color as a result of light being transmitted (added)
Display color as a result of light being absorbed (subtracted) by the printing inks. As more ink is added, less light is reflected.
The total absence of light would be perceived as black.
The total absence of ink the resulting light being reflected (from a white surface) would be perceived as white.
Computers generally display RGB using 24-bit color.
colors are represented as percentages
Therefore there are 16,777,216 possible colors (256 reds x 256 greens x 256 blues) in the 24-bit RGB color model.
Once an image has been converted from RGB to CMYK and brought into printable gamut, the extra RGB data will be lost.
List of Raster graphics editors
List of vector graphics editors
Adobe Photoshop
Adobe Illustrator
Microsoft Paint
Adobe Fireworks (Macromedia Fireworks)
Corel Paint Shop Pro
Adobe Flash (Macromedia Flash)
Corel Photo-Paint
Adobe FreeHand (Macromedia FreeHand) CorelDraw
Color Depth • Color "depth" is defined by the number of bits per pixel that can be displayed on a computer screen. Data is stored in bits. Each bit represents two colors because it has a value of 0 or 1. The more bits per pixel, the more colors that can be displayed. Examples of color depth are shown in the following table: • Color Depth No. of Colors 1 bit color 2 4 bit color 16 8 bit color 256 24 bit color 16,777,216
File Extensions •
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JPEG - Joint Photographic Experts Group - Used for photographic (continuous tone) images. Unlike GIF files the JPEG format can take advantage of the full spectrum of colors available to your monitor. The JPEG format also uses compression for smaller files and faster downloads. However, unlike the compression method used in GIF files, the JPEG compression is "lossy" which means it discards data in the process. Once a file is saved in JPEG format the data is permanently lost. If you want all the image data available for future use, save the image using no compression or "lossless" compression and make JPEG copies from it. GIF - Graphics Interchange Format - Images using a fixed color palette (limited to only 256 colors - not the full spectrum of colors available to your monitor). The GIF format uses compression for smaller files and faster downloads. This format is best for images with solid colors or areas of uniform color such as illustrations and logos. TIFF - Tagged-Image File Format - Used for bitmaps only. The TIFF format is supported by virtually all graphics applications. EPS - Encapsulated PostScript® - A file format used for both vector graphics and bitmaps.
list of some of the things Photoshop CS is capable of:
Painting with different colors
Straightening Your Images
Blurring
Replacing colors
Darkening Images
Adding colors to Black & white images
Smudge
Remove blemish, marks, spots & blotch
Changing eye color
Changing Hair Color
Whitening Teeth
Whitening Eyes
Removing Red Eyes
Removing Wrinkles
Sharpen images.
Fix images with poor color or lighting conditions
Repair old photographs
Removing Background Items From Photos
Adding text
Removing People From Photos
Editing Images
Removing undesired things
Convert Images to Grayscale
Reveal parts of an image hidden in shadow.
Adjust Hue And Saturation
Making edits on the perspective planes
Applying Filters to images
Using Layer Styles
Make patterns
Blending Photos
Create Logos for comanies
Bussiness Cards
Web Page Design
Animation
3D images
Workspace switcher Application Bar Control Panel Tabbed Document window
Tools Panel
Adjustment panel
Collapse to icon button