get-image-orientation

Get Image Orientation

Utility for determining image orientation and aspect ratio.

Installation

Run npm install get-image-orientation --save

Usage

const getImageOrientation = require('get-image-orientation');
const image = {
    width: 320,
    height: 240
};
const {
    aspect, // number/int/float
    isPortrait, // boolean
    isLandscape, // boolean
    isSquare, // boolean
    widthIncrease, // number/int
    heightIncrease, // number/int
    isSquareLikePortrait, // boolean
    isSquareLikeLandscape // boolean
    ratio // string
} = getImageOrientation(image.width, image.height, 10);

Syntax

getImageOrientation(320, 240, 10);

Parameters

• width - image width, REQUIRED

• height - image height, REQUIRED

• maxIncrease - max width/height increase in percentage, default = 15. maxIncrease is used for determining isSquareLikePortrait and isSquareLikeLandscape flags.

API

getImageOrientation returns the following fields:

aspect

Number (int/float). This value represents the aspect of the image. It refers to the image height, when that image has a landscape orientation. When the image has a portrait orientation, it refers to its width. Aspect is calculated by the formula image.width / image.height.

isPortrait

Boolean. Determines if the image has a portrait orientation. An image has a portrait orientation, when image.width > image.height.

isLandscape

Boolean. Determines if the image has a landscape orientation. An image has a landscape orientation, when image.width < image.height.

isSquare

Boolean. Determines if the image has a square orientation. An image has a square orientation, when image.width === image.height.

widthIncrease

Number (int). This value represents the width increase, compared to image.height in percentage, eg ((width - height) * 100) / width. Width increase is calculated when isLandscape is true. Otherwise, it returns 0.

heightIncrease

Number (int). This value represents the height increase, compared to image.width in percentage, eg ((height - width) * 100) / height. Height increase is calculated when isPortrait is true. Otherwise, it returns 0.

isSquareLikePortrait

Boolean. Determines if the image has a square-like portrait orientation. An image has a square-like portrait orientation, when that image isPortrait and its heightIncrease is less than or equal to maxIncrease. In other words, this check returns true for near-square portrait images, with height just a bit bigger than their width. This check is useful for differentiating standard portrait images from square-like images.

isSquareLikeLandscape

Boolean. Determines if the image has a square-like landscape orientation. An image has a square-like landscape orientation, when that image isLandscape and its widthIncrease is less than or equal to maxIncrease. This check returns true for near-square landscape images, with width just a bit bigger than their height. This check is useful for differentiating standard landscape images from square-like images.

ratio

String. Represents the closest matching aspect ratio for the image. Available ratios are:

• 2/3
• 1/1
• 4/3
• 16/10
• 5/3
• 16/9
• 21/9

Tests

const orientation = getImageOrientation(1600, 900);

// orientation contains:
{
    aspect: 1.78,
    isPortrait: false,
    isLandscape: true,
    isSquare: false,
    isSquareLikePortrait: false,
    isSquareLikeLandscape: false,
    widthIncrease: 43,
    heightIncrease: 0,
    ratio: '16/9'
}

const orientation = getImageOrientation(322, 480);

// orientation contains:
{
    aspect: 0.67,
    isPortrait: true,
    isLandscape: false,
    isSquare: false,
    isSquareLikePortrait: false,
    isSquareLikeLandscape: false,
    widthIncrease: 0,
    heightIncrease: 32,
    ratio: '2/3'
}

const orientation = getImageOrientation(555, 480);

// orientation contains:
{
    aspect: 1.16,
    isPortrait: false,
    isLandscape: true,
    isSquare: false,
    isSquareLikePortrait: false,
    isSquareLikeLandscape: true,
    widthIncrease: 13,
    heightIncrease: 0,
    ratio: '1/1'
}

const orientation = getImageOrientation(413, 480);

// orientation contains:
{
    aspect: 0.86,
    isPortrait: true,
    isLandscape: false,
    isSquare: false,
    isSquareLikePortrait: true,
    isSquareLikeLandscape: false,
    widthIncrease: 0,
    heightIncrease: 13,
    ratio: '1/1'
}

const orientation = getImageOrientation(480, 480);

// orientation contains:
{
    aspect: 1,
    isPortrait: false,
    isLandscape: false,
    isSquare: true,
    isSquareLikePortrait: false,
    isSquareLikeLandscape: false,
    widthIncrease: 0
    heightIncrease: 0,
    ratio: '1/1'
}