image-output

Output image data to a destination: file, canvas, console, stdout, ImageData etc.

Usage

var output = require('image-output')

// create chess pattern png from raw pixels data
output({
	data: [0,0,0,1, 1,1,1,1, 1,1,1,1, 0,0,0,1],
	width: 2,
	height: 2
}, 'chess.png')

API

`output(source, destination?, options?)`

Output pixel data source to a destination based on options. Undefined destination displays image to console/stdout. The operation is done in sync fashion.

`source`

Shoud be an actual image data container, one of:

Canvas, Context2D, WebGLContext
ImageData
Object {data: Uint8Array, width, height}
DataURL or base64 string
Image, Video, ImageBitmap with resolved data
Array, Array of Arrays, Uint8Array, FloatArray with raw pixels
ArrayBuffer, Buffer
Ndarray

Handy for that purpose is image-pixels:

var pixels = require('image-pixels')
output(await pixels('image.png'), 'image-copy.png')

`destination`

Can be any image output destination:

Type	Meaning
String	File to create or path, in node. If includes extension, mimeType is detected from it.
Canvas2D, Context2D	Render pixel data into a canvas. Canvas is resized to fit the image data. To avoid resizing, use `options.clip` property.
`document`, Element	Create a canvas with diff data in document or element.
`console`	Display image to console in browser or to terminal in node.
Array / FloatArray	Write pixel data normalized to [0..1] range to a float-enabled array.
UintArray	Put pixel data to any unsigned int array.
Buffer / ArrayBuffer	Put pixel data into a buffer, possibly encoded into target format by `options.type`.
Ndarray	Write pixel data into an ndarray.
ImageData	Put data into ImageData instance, browser only.
Object	Create `data`, `width` and `height` properties on an object.
Function	Call a function with ImageData as argument.
Stream	Send data to stream, eg. `process.stdout`.

`options`

Property	Meaning
`width`, `height`	Explicitly indicate input data shape (columns, rows), if input has no dimensions info.
`type` / `mime`	Encode into target type, by default detected from file extension. By default `image/png`.
`quality`	Defines encoding quality, 0..1, optional. By default 1.
`...rest`	Rest of options is passed to encoder.

Customize color palette in terminal

You can choose color palette with flags or environment variable FORCE_COLOR=0123

node ./script.js --no-color
node ./script.js --color
node ./script.js --color=256
node ./script.js --color=16m

image-equal − compare if two images are equal.
image-pixels − load image data from any source.
image-encode − encode image data into one of the target formats.

Similar

save-pixels − output ndarray with image pixels to a file.
terminal-image − print image to a terminal.

dy/image-output