Photoshop CS v8.0

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Photoshop CS (v8.0)

• Lecture 03
• Colours and Layers

Richard Cooksey R.M.Cooksey_at_2002.ljmu.ac.uk
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RGB Colour System

• 256 colours per channel
• (8 bits)
• Default mode for Photoshop
• CMYK commonly used for printing
• Web colours 00-FF

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RGB Colour System

• More colours (gt8bit) allows for better image
  enhancements
• Details and definition can be enhanced where
  desired
• Low colour depths lead to Posterization

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More Colours

• Scanning at high colour depths
• RAW digital photos
• Combining multiple photos

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Colour Picker

• Find exact colour
• Uses multiple colour systems
• Provides HTML colours
• Web colours for PC/Mac compatibility

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Paintbrush

• Basic drawing tool
• Many modes can be used in conjunction with tool
• Colour mode affects only colour and not the
  underlying texture

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Clone Stamp Tool Colour

• Transfers colour information only
• Preserves underlying texture

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Layers

• Stack images or image parts on top of each other
• Allows image data to be kept separate
• Toggle visibility
• Adjust opacity

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Background Layer

• Image Base
• Always at bottom of stack
• Layer effects cannot be applied to it
• Double click to convert to normal layer

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Locking Layers

• Locking options
• Transparent pixels
• Image pixels
• Position
• All
• Right-click on layer for options relating to it

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Text Layers

• Special kind of layer
• Not rasterized
• Preserves text attributes so that changes can be
  made
• Anti-aliasing can smooth fonts

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Image Formats

• Image Detail
• PSD (.psd) Photoshop Format
• Uncompressed, lossless, high colour depths,
  preserves layers
• RAW (.raw) Raw Format (many standards)
• Uncompressed, lossless, high colour depth

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Summary

• RGB Colour
• Commonly images are 24-bit three 8-bit colour
  channels
• Colour picker allows exact colour to be selected
• More colours makes for better outputs
• HTML and Web colours selectable
• Paintbrush
• Basic drawing tool
• Customise effect of brush with modes and
  attributes
• Colour mode preserves texture whilst changing
  colour
• Layers
• Separate elements of image data
• Manipulate layers independently
• Text has own layer type that preserves text
  properties