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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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test/fixtures/8bit_depth.tiff vendored Normal file
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1
test/fixtures/index.js vendored
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@@ -85,6 +85,7 @@ module.exports = {
inputTiff: getPath('G31D.TIF'), // http://www.fileformat.info/format/tiff/sample/e6c9a6e5253348f4aef6d17b534360ab/index.htm
inputTiffCielab: getPath('cielab-dagams.tiff'), // https://github.com/lovell/sharp/issues/646
inputTiffUncompressed: getPath('uncompressed_tiff.tiff'), // https://code.google.com/archive/p/imagetestsuite/wikis/TIFFTestSuite.wiki file: 0c84d07e1b22b76f24cccc70d8788e4a.tif
inputTiff8BitDepth: getPath('8bit_depth.tiff'),
inputGif: getPath('Crash_test.gif'), // http://upload.wikimedia.org/wikipedia/commons/e/e3/Crash_test.gif
inputGifGreyPlusAlpha: getPath('grey-plus-alpha.gif'), // http://i.imgur.com/gZ5jlmE.gif
inputSvg: getPath('check.svg'), // http://dev.w3.org/SVG/tools/svgweb/samples/svg-files/check.svg

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)