Module colorops

Functions for altering and converting the color of pixelbufs

Structs

• BiLevel
  A bi-level color map

Traits

• ColorMap
  A color map

Functions

• brighten
  Brighten the supplied image. value is the amount to brighten each pixel by. Negative values decrease the brightness and positive values increase it.
• brighten_in_place
  Brighten the supplied image in place. value is the amount to brighten each pixel by. Negative values decrease the brightness and positive values increase it.
• contrast
  Adjust the contrast of the supplied image. contrast is the amount to adjust the contrast by. Negative values decrease the contrast and positive values increase the contrast.
• contrast_in_place
  Adjust the contrast of the supplied image in place. contrast is the amount to adjust the contrast by. Negative values decrease the contrast and positive values increase the contrast.
• dither
  Reduces the colors of the image using the supplied color_map while applying Floyd-Steinberg dithering to improve the visual conception
• grayscale
  Convert the supplied image to grayscale. Alpha channel is discarded.
• grayscale_alpha
  Convert the supplied image to grayscale. Alpha channel is preserved.
• grayscale_with_type
  Convert the supplied image to a grayscale image with the specified pixel type. Alpha channel is discarded.
• grayscale_with_type_alpha
  Convert the supplied image to a grayscale image with the specified pixel type. Alpha channel is preserved.
• huerotate
  Hue rotate the supplied image. value is the degrees to rotate each pixel by. 0 and 360 do nothing, the rest rotates by the given degree value. just like the css webkit filter hue-rotate(180)
• huerotate_in_place
  Hue rotate the supplied image in place. value is the degrees to rotate each pixel by. 0 and 360 do nothing, the rest rotates by the given degree value. just like the css webkit filter hue-rotate(180)
• index_colors
  Reduces the colors using the supplied color_map and returns an image of the indices
• invert
  Invert each pixel within the supplied image. This function operates in place.