Module imageops

Image Processing Functions

Modules

colorops

Functions for altering and converting the color of pixelbufs

Structs

BiLevel

A bi-level color map

Enums

FilterType

Available Sampling Filters.

Traits

ColorMap

A color map

Functions

blur

Performs a Gaussian blur on the supplied image. sigma is a measure of how much to blur by. Use crate::imageops::fast_blur() for a faster but less accurate version. This method assumes alpha pre-multiplication for images that contain non-constant alpha.

brighten

Brighten the supplied image. 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.

crop

Return a mutable view into an image The coordinates set the position of the top left corner of the crop.

crop_imm

Return an immutable view into an image The coordinates set the position of the top left corner of the crop.

dither

Reduces the colors of the image using the supplied color_map while applying Floyd-Steinberg dithering to improve the visual conception

fast_blur

Approximation of Gaussian blur after Kovesi, P.: Fast Almost-Gaussian Filtering The Australian Pattern Recognition Society Conference: DICTA 2010. December 2010. Sydney. This method assumes alpha pre-multiplication for images that contain non-constant alpha.

filter3x3

Perform a 3x3 box filter on the supplied image. kernel is an array of the filter weights of length 9.

flip_horizontal

Flip an image horizontally

flip_horizontal_in

Flip an image horizontally and put the result into the destination ImageBuffer.

flip_horizontal_in_place

Flip an image horizontally in place.

flip_vertical

Flip an image vertically

flip_vertical_in

Flip an image vertically and put the result into the destination ImageBuffer.

flip_vertical_in_place

Flip an image vertically in place.

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.

horizontal_gradient

Fill the image with a linear horizontal gradient

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)

index_colors

Reduces the colors using the supplied color_map and returns an image of the indices

interpolate_bilinear

Linearly sample from an image using coordinates in [0, w-1] and [0, h-1].

interpolate_nearest

Sample from an image using coordinates in [0, w-1] and [0, h-1], taking the nearest pixel.

invert

Invert each pixel within the supplied image. This function operates in place.

overlay

Overlay an image at a given coordinate (x, y)

overlay_bounds

Calculate the region that can be copied from top to bottom.

replace

Replace the contents of an image at a given coordinate (x, y)

resize

Resize the supplied image to the specified dimensions. nwidth and nheight are the new dimensions. filter is the sampling filter to use. This method assumes alpha pre-multiplication for images that contain non-constant alpha.

rotate90

Rotate an image 90 degrees clockwise.

rotate90_in

Rotate an image 90 degrees clockwise and put the result into the destination ImageBuffer.

rotate180

Rotate an image 180 degrees clockwise.

rotate270

Rotate an image 270 degrees clockwise.

rotate180_in

Rotate an image 180 degrees clockwise and put the result into the destination ImageBuffer.

rotate180_in_place

Rotate an image 180 degrees clockwise in place.

rotate270_in

Rotate an image 270 degrees clockwise and put the result into the destination ImageBuffer.

sample_bilinear

Linearly sample from an image using coordinates in [0, 1].

sample_nearest

Sample from an image using coordinates in [0, 1], taking the nearest coordinate.

thumbnail

Resize the supplied image to the specific dimensions.

tile

Tile an image by repeating it multiple times

unsharpen

Performs an unsharpen mask on the supplied image. sigma is the amount to blur the image by. threshold is the threshold for minimal brightness change that will be sharpened.

vertical_gradient

Fill the image with a linear vertical gradient