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Default PNG output to adaptiveFiltering=false, compressionLevel=9

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PNG is mostly used for logos and line art, so these defaults will
produce the smallest files for most output most of the time.
This commit is contained in:
Lovell Fuller
2017-10-01 18:16:31 +01:00
parent 7b6c80327e
commit 99076edc89
5 changed files with 33 additions and 6 deletions
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23
test/unit/io.js
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@@ -628,6 +628,29 @@ describe('Input/output', function () {
});
});
it('default compressionLevel generates smaller file than compressionLevel=6', function (done) {
// First generate with default compressionLevel
sharp(fixtures.inputPng)
.resize(320, 240)
.png()
.toBuffer(function (err, defaultData, defaultInfo) {
if (err) throw err;
assert.strictEqual(true, defaultData.length > 0);
assert.strictEqual('png', defaultInfo.format);
// Then generate with compressionLevel=6
sharp(fixtures.inputPng)
.resize(320, 240)
.png({ compressionLevel: 6 })
.toBuffer(function (err, largerData, largerInfo) {
if (err) throw err;
assert.strictEqual(true, largerData.length > 0);
assert.strictEqual('png', largerInfo.format);
assert.strictEqual(true, defaultData.length < largerData.length);
done();
});
});
});
it('without adaptiveFiltering generates smaller file', function (done) {
// First generate with adaptive filtering
sharp(fixtures.inputPng)