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ef8db1eebf
Add `Sharp.compare(file1, file2, callback)` function for comparing images using mean squared error (MSE). This is useful for unit tests. See: - https://github.com/jcupitt/libvips/issues/291 - http://entropymine.com/imageworsener/resizealpha/
105 lines
3.3 KiB
JavaScript
Executable File
105 lines
3.3 KiB
JavaScript
Executable File
'use strict';
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var assert = require('assert');
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var fixtures = require('../fixtures');
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var sharp = require('../../index');
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sharp.cache(0);
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describe('Alpha transparency', function() {
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it('Flatten to black', function(done) {
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sharp(fixtures.inputPngWithTransparency)
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.flatten()
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.resize(400, 300)
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.toBuffer(function(err, data, info) {
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if (err) throw err;
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assert.strictEqual(400, info.width);
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assert.strictEqual(300, info.height);
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fixtures.assertSimilar(fixtures.expected('flatten-black.jpg'), data, done);
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});
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});
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it('Flatten to RGB orange', function(done) {
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sharp(fixtures.inputPngWithTransparency)
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.flatten()
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.background({r: 255, g: 102, b: 0})
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.resize(400, 300)
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.toBuffer(function(err, data, info) {
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if (err) throw err;
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assert.strictEqual(400, info.width);
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assert.strictEqual(300, info.height);
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fixtures.assertSimilar(fixtures.expected('flatten-orange.jpg'), data, done);
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});
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});
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it('Flatten to CSS/hex orange', function(done) {
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sharp(fixtures.inputPngWithTransparency)
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.flatten()
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.background('#ff6600')
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.resize(400, 300)
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.toBuffer(function(err, data, info) {
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if (err) throw err;
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assert.strictEqual(400, info.width);
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assert.strictEqual(300, info.height);
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fixtures.assertSimilar(fixtures.expected('flatten-orange.jpg'), data, done);
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});
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});
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it('Do not flatten', function(done) {
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sharp(fixtures.inputPngWithTransparency)
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.flatten(false)
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.toBuffer(function(err, data) {
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if (err) throw err;
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sharp(data).metadata(function(err, metadata) {
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if (err) throw err;
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assert.strictEqual('png', metadata.format);
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assert.strictEqual(4, metadata.channels);
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done();
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});
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});
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});
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it('Ignored for JPEG', function(done) {
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sharp(fixtures.inputJpg)
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.background('#ff0000')
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.flatten()
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.toBuffer(function(err, data) {
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if (err) throw err;
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sharp(data).metadata(function(err, metadata) {
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if (err) throw err;
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assert.strictEqual('jpeg', metadata.format);
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assert.strictEqual(3, metadata.channels);
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done();
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});
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});
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});
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it('Enlargement with non-nearest neighbor interpolation shouldn’t cause dark edges', function(done) {
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var BASE_NAME = 'alpha-premultiply-enlargement-2048x1536-paper.png';
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var actual = fixtures.path('output.' + BASE_NAME);
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var expected = fixtures.expected(BASE_NAME);
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sharp(fixtures.inputPngAlphaPremultiplicationSmall)
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.resize(2048, 1536)
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.interpolateWith('bicubic')
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.toFile(actual, function(err) {
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if (err) throw err;
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fixtures.assertEqual(actual, expected, done);
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});
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});
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it('Reduction with non-nearest neighbor interpolation shouldn’t cause dark edges', function(done) {
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var BASE_NAME = 'alpha-premultiply-reduction-1024x768-paper.png';
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var actual = fixtures.path('output.' + BASE_NAME);
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var expected = fixtures.expected(BASE_NAME);
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sharp(fixtures.inputPngAlphaPremultiplicationLarge)
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.resize(1024, 768)
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.interpolateWith('bicubic')
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.toFile(actual, function(err) {
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if (err) throw err;
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fixtures.assertEqual(actual, expected, done);
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});
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});
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});
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