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Image Filter Transformations

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Visual Effects

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Background Color (b_{color})

Set background color for transparent images or padded areas: 
tr-b_ff0000         # Red background
tr-b_000000        # Black background
tr-b_ffffff        # White background
tr-b_transparent   # Transparent background
  • Accepts hex color codes without ’#’
  • Use transparent for clear background
  • Commonly used with:
    • c_pad crop mode
    • PNG images with transparency
    • Rounded corners that expose background

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Border (bo_{width_style_color})

Add borders to images with specific width, style, and color: 
tr-bo_5px_solid_000000    # 5px solid black border
tr-bo_2px_dashed_ff0000   # 2px dashed red border
tr-bo_3px_dotted_cccccc   # 3px dotted gray border
Parameters:
  • Width: Specified in pixels (e.g., 1px, 5px)
  • Style: solid, dashed, dotted
  • Color: Hex color code without ’#’
Best practices:
  • Use solid borders for clean, professional looks
  • Consider border color contrast with image
  • Keep border width proportional to image size

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Corner Radius (r_{pixels})

Round image corners with flexible options: 
tr-r_20                # All corners 20px
tr-r_20:30:20:30      # Different radius for each corner (top-left:top-right:bottom-right:bottom-left)
tr-r_max              # Create circular/elliptical image
Features:
  • Single value applies to all corners
  • Four values for individual corner control
  • Special max value for circular images
  • Combines well with borders and background colors
Best practices:
  • Use consistent radius across your design
  • Consider max for profile pictures
  • Test with different image aspect ratios

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Rotation (a_{degrees})

Rotate images by specific degrees: 
tr-a_90               # Rotate 90 degrees clockwise
tr-a_180              # Rotate 180 degrees
tr-a_270              # Rotate 270 degrees clockwise (90 degrees counter-clockwise)
Features:
  • Accepts values from 0 to 360
  • Common values: 90, 180, 270
  • Maintains original image quality
  • May change effective dimensions

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Opacity (o_{percent})

Adjust image transparency: 
tr-o_50               # 50% opacity
tr-o_75               # 75% opacity
tr-o_25               # 25% opacity
Features:
  • Range: 0 (transparent) to 100 (opaque)
  • Useful for watermarks and overlays
  • Maintains image quality
  • Works with all image formats
Best practices:
  • Use higher values (70-90) for main images
  • Use lower values (20-50) for watermarks
  • Consider background when using transparency

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Blur (blur_{radius})

Apply Gaussian blur effect: 
tr-blur_10            # Light blur
tr-blur_50            # Medium blur
tr-blur_100           # Heavy blur
Features:
  • Radius range: 1-100
  • Lower values for subtle effect
  • Higher values for strong blur
  • Maintains edge smoothness
Common uses:
  • Background images
  • Privacy protection
  • Aesthetic effects
  • Loading placeholders

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Grayscale (e_grayscale)

Convert image to black and white: 
tr-e_grayscale        # Convert to grayscale
Features:
  • Full grayscale conversion
  • Maintains image contrast
  • Works with all image formats
  • Can be combined with other effects
Use cases:
  • Classic photo effect
  • Consistent visual style
  • Reducing visual complexity
  • Historical or vintage looks