Photoshop CS3

• Auto align layers
• Auto blend for stitched images
• Device Central 1.0
• Smart filters (non-destructive filters (including Shadows and Highlight) which you can combine with a mask)
• Quick selection tool
• Adjustable Cloning and Healing with preview overlay
• Zoomify (Google maps style zoom interface for web based images)
• Improved curves
• Refine Edge (to modify the edge of any selection)
• Refined interface (see examples below)
• Enhanced Brightness/Contrast
• New advanced Black and White conversion tool
• Improved print window
• 2 new blend modes: Lighter Color, Darker Color
• Enhanced Photo Merge function
• Enhanced Merge to 23-Bit HDR
• Enhanced Channel Mixer (filter presets)
• New Bridge version
• Improved vanishing point with multiple, adjustable angle perspective planes
• Camera Raw 4.0

Photoshop CS2

• Adobe Bridge
• Vanishing Point
• Multiple layer control
• Smart Objects
• Multi-image digital camera raw file processing
• Advanced noise reduction
• 32-bit High Dynamic Range (HDR) support
• Customizable workspaces and menus
• Spot Healing Brush
• Warp Tool
• One-click red-eye correction
• WYSIWYG font menu
• Smart Guides
• High-capacity RAM compatibility
• Digital camera and Digital Negative (DNG) support
• Smart Sharpen
• Optical lens correction (distort)
• Spot Healing Brush
• Help improvements
• Box, shape and surface blur
• Reduce Noise
• Animation (was Imageready)
• Variables
• Expanded ability to edit 16-bit files
• Layer Sets renamed to Layer Groups
• Enhanced Info Palette
• Exposure (Image/adjustements)
• Visible Cursor on 50% gray layers

Photoshop CS

• Custom Keyboard shortcuts
• History Log
• Camera Raw Plugin
• Match Color
• Live Histograms
• Photo Filters
• Color Replacement Tool
• Shadow/Highlight
• Text On Path
• Layer Comps
• Large Document Format (PSB) Supporting 300,000x300,000 pixels and 54 channels
• Non-square pixels
• Enhanced File Browser
• Expanded ability to edit 16-bit files
• Lens Blur filter
• Customizable help
• Improved Photomerge
• Auto-cropping and straightening of multiple images
• Extended 16-bit support
• New image interpolation methods: Bicubic Sharper/Smoother
• Hard mix blending mode

Photoshop 7

• Context sensitive options bar
• Tool presets
• Healing Brush
• Patch Tool
• Auto Color
• Brushes palette
• Spell check
• Pattern Maker
• Redesigned tool bar (colors)
• Large filter previews
• Liquify improvements
• Improved Web-Gallery
• Improved Picture Package

Photoshop 6

• Droplets
• Annotations
• Docking palettes
• Type Tool makeover
• Warp Text