sharp/test/unit/gamma.js

85 lines
2.7 KiB
JavaScript

'use strict';
const assert = require('assert');
const sharp = require('../../');
const fixtures = require('../fixtures');
describe('Gamma correction', function () {
it('value of 0.0 (disabled)', function (done) {
sharp(fixtures.inputJpgWithGammaHoliness)
.resize(129, 111)
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(129, info.width);
assert.strictEqual(111, info.height);
fixtures.assertSimilar(fixtures.expected('gamma-0.0.jpg'), data, { threshold: 9 }, done);
});
});
it('value of 2.2 (default)', function (done) {
sharp(fixtures.inputJpgWithGammaHoliness)
.resize(129, 111)
.gamma()
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(129, info.width);
assert.strictEqual(111, info.height);
fixtures.assertSimilar(fixtures.expected('gamma-2.2.jpg'), data, done);
});
});
it('value of 3.0', function (done) {
sharp(fixtures.inputJpgWithGammaHoliness)
.resize(129, 111)
.gamma(3)
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(129, info.width);
assert.strictEqual(111, info.height);
fixtures.assertSimilar(fixtures.expected('gamma-3.0.jpg'), data, { threshold: 6 }, done);
});
});
it('input value of 2.2, output value of 3.0', function (done) {
sharp(fixtures.inputJpgWithGammaHoliness)
.resize(129, 111)
.gamma(2.2, 3.0)
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(129, info.width);
assert.strictEqual(111, info.height);
fixtures.assertSimilar(fixtures.expected('gamma-in-2.2-out-3.0.jpg'), data, { threshold: 6 }, done);
});
});
it('alpha transparency', function (done) {
sharp(fixtures.inputPngOverlayLayer1)
.resize(320)
.gamma()
.jpeg()
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
fixtures.assertSimilar(fixtures.expected('gamma-alpha.jpg'), data, done);
});
});
it('invalid first parameter value', function () {
assert.throws(function () {
sharp(fixtures.inputJpgWithGammaHoliness).gamma(4);
});
});
it('invalid second parameter value', function () {
assert.throws(function () {
sharp(fixtures.inputJpgWithGammaHoliness).gamma(2.2, 4);
});
});
});