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Usage - %image filter_list

Valid Filters

• rotate [n] - rotates an image n degrees counter-clockwise.
• autocontrast - stretches the image over the widest range possible
• invert - inverts the image's colors
• grayscale
• sepia
• posterize [n] - keeps n bits of the image's colors
• solarize [n] - inverts values with a luminance above n
  • n defaults to 128 or half-brightness
• flip - flips an image top-to-bottom
• mirror - flips an image right-to-left
• blur [n] - applies a gaussian blur with a radius of n pixels
  • n defaults to 2
• scale [n] - scales an image, with bicubic filtering¹
• pscale [n] - scales an image, with nearest pixel filtering¹
• scalexy [w] [h] - scales an image by relative width and height¹ with bicubic pixel filtering
• pscalexy [w] [h] - scales an image by relative width and height¹ with nearest pixel filtering
• potography - applies %image pscalexy 0.05 0.25, pscalexy 20 4, posterize 2, sepia, rotate 25
• matrix [w] [h] - scales the image to a matrix of w by h, and scales it back to the image size

¹ - n, x, and y are all relative. A value of 1 means no scaling is done (100%)