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Add removeAlpha op, removes alpha channel if any #1248

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Lovell Fuller
2018-08-07 20:32:11 +01:00
parent 25bd2cea3e
commit c14434f9e7
10 changed files with 93 additions and 24 deletions
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46
test/unit/alpha.js
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@@ -81,35 +81,45 @@ describe('Alpha transparency', function () {
});
});
it('Enlargement with non-nearest neighbor interpolation shouldn’t cause dark edges', function (done) {
it('Enlargement with non-nearest neighbor interpolation shouldn’t cause dark edges', function () {
const base = 'alpha-premultiply-enlargement-2048x1536-paper.png';
const actual = fixtures.path('output.' + base);
const expected = fixtures.expected(base);
sharp(fixtures.inputPngAlphaPremultiplicationSmall)
return sharp(fixtures.inputPngAlphaPremultiplicationSmall)
.resize(2048, 1536)
.toFile(actual, function (err) {
if (err) {
done(err);
} else {
fixtures.assertMaxColourDistance(actual, expected, 102);
done();
}
.toFile(actual)
.then(function () {
fixtures.assertMaxColourDistance(actual, expected, 102);
});
});
it('Reduction with non-nearest neighbor interpolation shouldn’t cause dark edges', function (done) {
it('Reduction with non-nearest neighbor interpolation shouldn’t cause dark edges', function () {
const base = 'alpha-premultiply-reduction-1024x768-paper.png';
const actual = fixtures.path('output.' + base);
const expected = fixtures.expected(base);
sharp(fixtures.inputPngAlphaPremultiplicationLarge)
return sharp(fixtures.inputPngAlphaPremultiplicationLarge)
.resize(1024, 768)
.toFile(actual, function (err) {
if (err) {
done(err);
} else {
fixtures.assertMaxColourDistance(actual, expected, 102);
done();
}
.toFile(actual)
.then(function () {
fixtures.assertMaxColourDistance(actual, expected, 102);
});
});
it('Removes alpha from fixtures with transparency, ignores those without', function () {
return Promise.all([
fixtures.inputPngWithTransparency,
fixtures.inputPngWithTransparency16bit,
fixtures.inputWebPWithTransparency,
fixtures.inputJpg,
fixtures.inputPng,
fixtures.inputWebP
].map(function (input) {
return sharp(input)
.removeAlpha()
.toBuffer({ resolveWithObject: true })
.then(function (result) {
assert.strictEqual(3, result.info.channels);
});
}));
});
});