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Add greyscale option to threshold operation (#480)

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This commit is contained in:
Matt Hirsch
2016-07-03 14:32:07 -04:00
committed by Lovell Fuller
parent 4b98dbb454
commit 85f20c6e1b
8 changed files with 55 additions and 3 deletions
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25
test/unit/threshold.js
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@@ -52,8 +52,21 @@ describe('Threshold', function() {
assert.strictEqual(240, info.height);
fixtures.assertSimilar(fixtures.expected('threshold-128.jpg'), data, done);
});
});
it('threshold grayscale: true (=128)', function(done) {
sharp(fixtures.inputJpg)
.resize(320, 240)
.threshold(128,{'grayscale':true})
.toBuffer(function(err, data, info) {
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
fixtures.assertSimilar(fixtures.expected('threshold-128.jpg'), data, done);
});
});
it('threshold default jpeg', function(done) {
sharp(fixtures.inputJpg)
.resize(320, 240)
@@ -101,6 +114,18 @@ describe('Threshold', function() {
});
}
it('color threshold', function(done) {
sharp(fixtures.inputJpg)
.resize(320, 240)
.threshold(128,{'grayscale':false})
.toBuffer(function(err, data, info) {
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
fixtures.assertSimilar(fixtures.expected('threshold-color-128.jpg'), data, done);
});
});
it('invalid threshold -1', function() {
assert.throws(function() {
sharp(fixtures.inputJpg).threshold(-1);