The image jpeg library

Types

Image = clone list :

Contains a bitmap, a clone of list in which the elements are the columns of the bitmap, i.e. lists with elements of type Color.

JpegFile = struct (name string, quality int?) :

Specifies where we should be loading the .jpg file from, or saving it to, plus the quality of the coding if we are writing the file.

Config = struct (colorModel type, w int, h int) :

The metadata for an Image.

Cmyk = struct (c int, m int, y int, k int) :

Represents a fully opaque color in the CMYK color model, with 8 bit for each dimension.

Gray = struct (g int) :

Represents a shade of gray in 8-bit gray scale.

Rgba = struct (r int, g int, b int, a int) :

Represents a color in the RGBA color model, with 8 bits for each dimension.

Rgb = struct (r int, g int, b int) :

Like Rgba, but every color is fully opaque.

Rgba_64 = struct (r int, g int, b int, a int) :

Represents a color in the RGBA color model, with 16 bits for each dimension.

Rgb_64 = struct (r int, g int, b int) :

Like Rgba_64, but every color is fully opaque.

YCbCr = struct (y int, cb int, cr int) :

Representation of a fully opaque 24-bit Y'CbCr color, having 8 bits each for one luma and two chroma components.

Color = abstract Cmyk/Gray/Rgb/Rgba/Rgb_64/Rgba_64/YCbCr :

The abstract type containing the various color types, Rgb, Rgba, Cmyk, etc.

Commands

get(x ref) from (b JpegFile) :

Populates the reference variable with an Image from the file named in the name field of the JpegFile. The quality field is ignored.

post(I Image) to (b JpegFile) :

Posts the image to the file named in the name field of the JpegFile. If the quality field is NULL, a default value will be used.

Functions

JpegFile(name string) :

Overloads the constructor for JpegFile so that if only the name is supplied, the quality field is NULL.

newImage(w int, h int, fillColor Color) :

Constructs a new image of the given dimensions and filled with the given color.

width(I Image) -> int :

Returns the width of the image.

height(I Image) -> int :

Returns the height of the image.

(I Image) with (args ... pair) -> Image :

Overloads the standard with to perform validation.

model(I Image) -> type :

Returns the color model of the image, i.e. a type in the abstract type Color.

string(I Image) :

Returns the metadata of the image as a string.

swatch(c Color) :

Returns a string consisting of "█" with control codes so that it'll display the given color.

Notes

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