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Add chroma subsampling options for JPEG output

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Lovell Fuller
2015-02-13 09:41:42 +00:00
parent 0e91ca90d6
commit 1f7e80e581
7 changed files with 69 additions and 5 deletions
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29
test/unit/io.js
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@@ -459,6 +459,35 @@ describe('Input/output', function() {
});
it('Without chroma subsampling generates larger file', function(done) {
// First generate with chroma subsampling (default)
sharp(fixtures.inputJpg)
.resize(320, 240)
.withoutChromaSubsampling(false)
.toBuffer(function(err, withChromaSubsamplingData, withChromaSubsamplingInfo) {
if (err) throw err;
assert.strictEqual(true, withChromaSubsamplingData.length > 0);
assert.strictEqual(withChromaSubsamplingData.length, withChromaSubsamplingInfo.size);
assert.strictEqual('jpeg', withChromaSubsamplingInfo.format);
assert.strictEqual(320, withChromaSubsamplingInfo.width);
assert.strictEqual(240, withChromaSubsamplingInfo.height);
// Then generate without
sharp(fixtures.inputJpg)
.resize(320, 240)
.withoutChromaSubsampling()
.toBuffer(function(err, withoutChromaSubsamplingData, withoutChromaSubsamplingInfo) {
if (err) throw err;
assert.strictEqual(true, withoutChromaSubsamplingData.length > 0);
assert.strictEqual(withoutChromaSubsamplingData.length, withoutChromaSubsamplingInfo.size);
assert.strictEqual('jpeg', withoutChromaSubsamplingInfo.format);
assert.strictEqual(320, withoutChromaSubsamplingInfo.width);
assert.strictEqual(240, withoutChromaSubsamplingInfo.height);
assert.strictEqual(true, withChromaSubsamplingData.length < withoutChromaSubsamplingData.length);
done();
});
});
});
it('Convert SVG, if supported, to PNG', function(done) {
sharp(fixtures.inputSvg)
.resize(100, 100)