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Add support for squashing TIFF output to 1-bit (#783)

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This commit is contained in:
YvesBos
2017-04-27 00:47:29 +08:00
committed by Lovell Fuller
parent 567e3dd258
commit 4cd3b66761
7 changed files with 53 additions and 1 deletions
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38
test/unit/io.js
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@@ -861,6 +861,44 @@ describe('Input/output', function () {
});
});
it('Not squashing TIFF to a bit depth of 1 should not change the file size', function (done) {
const startSize = fs.statSync(fixtures.inputTiff8BitDepth).size;
sharp(fixtures.inputTiff8BitDepth)
.toColourspace('b-w') // can only squash 1 band uchar images
.tiff({
squash: false,
compression: 'none'
})
.toFile(fixtures.outputTiff, (err, info) => {
if (err) throw err;
assert.strictEqual('tiff', info.format);
assert(info.size === startSize);
fs.unlink(fixtures.outputTiff, done);
});
});
it('Squashing TIFF to a bit depth of 1 should significantly reduce file size', function (done) {
const startSize = fs.statSync(fixtures.inputTiff8BitDepth).size;
sharp(fixtures.inputTiff8BitDepth)
.toColourspace('b-w') // can only squash 1 band uchar images
.tiff({
squash: true,
compression: 'none'
})
.toFile(fixtures.outputTiff, (err, info) => {
if (err) throw err;
assert.strictEqual('tiff', info.format);
assert(info.size < (startSize / 2));
fs.unlink(fixtures.outputTiff, done);
});
});
it('Invalid TIFF squash value throws error', function () {
assert.throws(function () {
sharp().tiff({ squash: 'true' });
});
});
it('TIFF lzw compression with horizontal predictor shrinks test file', function (done) {
const startSize = fs.statSync(fixtures.inputTiffUncompressed).size;
sharp(fixtures.inputTiffUncompressed)