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Ensure linear op works with 16-bit input #3605

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Lovell Fuller 2023-04-01 12:08:14 +01:00
parent 97cf69c26a
commit b9c3851515
4 changed files with 16 additions and 2 deletions
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3
docs/changelog.md
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@ -9,6 +9,9 @@ Requires libvips v8.14.2
* Ensure use of `flip` operation forces random access read (regression in 0.32.0).
[#3600](https://github.com/lovell/sharp/issues/3600)
* Ensure `linear` operation works with 16-bit input (regression in 0.31.3).
[#3605](https://github.com/lovell/sharp/issues/3605)
### v0.32.0 - 24th March 2023
* Default to using sequential rather than random access read where possible.

5
src/operations.cc
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@ -332,12 +332,13 @@ namespace sharp {
if (a.size() > bands) {
throw VError("Band expansion using linear is unsupported");
}
bool const uchar = !Is16Bit(image.interpretation());
if (HasAlpha(image) && a.size() != bands && (a.size() == 1 || a.size() == bands - 1 || bands - 1 == 1)) {
// Separate alpha channel
VImage alpha = image[bands - 1];
return RemoveAlpha(image).linear(a, b, VImage::option()->set("uchar", TRUE)).bandjoin(alpha);
return RemoveAlpha(image).linear(a, b, VImage::option()->set("uchar", uchar)).bandjoin(alpha);
} else {
return image.linear(a, b, VImage::option()->set("uchar", TRUE));
return image.linear(a, b, VImage::option()->set("uchar", uchar));
}
}

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test/fixtures/expected/linear-16bit.png vendored Normal file
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10
test/unit/linear.js
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@ -51,6 +51,16 @@ describe('Linear adjustment', function () {
});
});
it('applies linear levels adjustment to 16-bit w alpha ch', function (done) {
sharp(fixtures.inputPngWithTransparency16bit)
.linear(a, b)
.png({ compressionLevel: 0 })
.toBuffer(function (err, data) {
if (err) throw err;
fixtures.assertSimilar(fixtures.expected('linear-16bit.png'), data, done);
});
});
it('applies slope level adjustment w alpha ch', function (done) {
sharp(fixtures.inputPngOverlayLayer1)
.resize(240)