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Allow images with alpha channel to use LAB sharpen #490

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Lovell Fuller 2016-07-04 21:33:44 +01:00
parent b70a7d9a3b
commit 4c172d25f6
4 changed files with 29 additions and 1 deletions
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4
docs/changelog.md
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@ -38,6 +38,10 @@ Requires libvips v8.3.1
[#486](https://github.com/lovell/sharp/issues/486)
[@kapouer](https://github.com/kapouer)
* Allow images with an alpha channel to work with LAB-colourspace based sharpen.
[#490](https://github.com/lovell/sharp/issues/490)
[@jwagner](https://github.com/jwagner)
#### v0.15.0 - 21<sup>st</sup> May 2016
* Use libvips' new Lanczos 3 kernel as default for image reduction.

6
src/operations.cc
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@ -244,9 +244,13 @@ namespace sharp {
return image.conv(sharpen);
} else {
// Slow, accurate sharpen in LAB colour space, with control over flat vs jagged areas
VipsInterpretation colourspaceBeforeSharpen = image.interpretation();
if (colourspaceBeforeSharpen == VIPS_INTERPRETATION_RGB) {
colourspaceBeforeSharpen = VIPS_INTERPRETATION_sRGB;
}
return image.sharpen(
VImage::option()->set("sigma", sigma)->set("m1", flat)->set("m2", jagged)
);
).colourspace(colourspaceBeforeSharpen);
}
}

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test/fixtures/expected/sharpen-rgba.png vendored Normal file
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20
test/unit/sharpen.js
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@ -12,6 +12,7 @@ describe('Sharpen', function() {
.resize(320, 240)
.sharpen(6)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
@ -24,6 +25,7 @@ describe('Sharpen', function() {
.resize(320, 240)
.sharpen(1.5, 0.5, 2.5)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
@ -36,6 +38,7 @@ describe('Sharpen', function() {
.resize(320, 240)
.sharpen(3.5, 2, 4)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
@ -43,11 +46,26 @@ describe('Sharpen', function() {
});
});
it('specific radius/levels with alpha channel', function(done) {
sharp(fixtures.inputPngWithTransparency)
.resize(320, 240)
.sharpen(5, 4, 8)
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('png', info.format);
assert.strictEqual(4, info.channels);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
fixtures.assertSimilar(fixtures.expected('sharpen-rgba.png'), data, done);
});
});
it('mild sharpen', function(done) {
sharp(fixtures.inputJpg)
.resize(320, 240)
.sharpen()
.toBuffer(function(err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
assert.strictEqual(240, info.height);
@ -78,6 +96,7 @@ describe('Sharpen', function() {
.resize(320, 240)
.sharpen(false)
.toBuffer(function(err, notSharpened, info) {
if (err) throw err;
assert.strictEqual(true, notSharpened.length > 0);
assert.strictEqual('jpeg', info.format);
assert.strictEqual(320, info.width);
@ -86,6 +105,7 @@ describe('Sharpen', function() {
.resize(320, 240)
.sharpen(true)
.toBuffer(function(err, sharpened, info) {
if (err) throw err;
assert.strictEqual(true, sharpened.length > 0);
assert.strictEqual(true, sharpened.length > notSharpened.length);
assert.strictEqual('jpeg', info.format);