Repository: lovell/sharp
Pull request #4172 (2024-07-21 19:36:21)

Expose optional minAmpl parameter of blur operation
following https://github.com/lovell/sharp/pull/4168, this PR adds `minAmpl` option to `.blur()`, completing the exposure of all options of `vips_gaussblur()`.

lovell: Thank you for the PR Marcos.

I usually prefer for the parameter names in sharp to match libvips for consistency as you've done here but I feel "ampl" might be better expanded in the external API to "amplitude" to remove any ambiguity, perhaps as `minAmplitude`.

It might also be good to include the libvips description of this property in the JSDocs, something like "A smaller value will generate a larger, more accurate mask".

https://github.com/libvips/libvips/blob/81b6b783f09fd7acd0e0ede1a28fef906ce810e9/libvips/convolution/gaussblur.c#L186
marcosc90: > I usually prefer for the parameter names in sharp to match libvips for consistency as you've done here but I feel "ampl" might be better expanded in the external API to "amplitude" to remove any ambiguity, perhaps as `minAmplitude`.

I had the same thought, I preferred `minAmplitude` but went with `minAmpl` to mimic libvips. I'll push the changes in a bit.
marcosc90: @lovell I left internal API with `minAmpl`, let me know if you want this changed as well.

Patch:
diff --git a/docs/api-operation.md b/docs/api-operation.md
index 170e3d58..86f07e58 100644
--- a/docs/api-operation.md
+++ b/docs/api-operation.md
@@ -250,6 +250,7 @@ When a `sigma` is provided, performs a slower, more accurate Gaussian blur.
 | [options] | <code>Object</code> \| <code>number</code> \| <code>Boolean</code> |  |  |
 | [options.sigma] | <code>number</code> |  | a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`. |
 | [options.precision] | <code>string</code> | <code>&quot;&#x27;integer&#x27;&quot;</code> | How accurate the operation should be, one of: integer, float, approximate. |
+| [options.minAmplitude] | <code>number</code> | <code>0.2</code> | A value between 0.001 and 1. A smaller value will generate a larger, more accurate mask. |
 
 **Example**  
 ```js
diff --git a/docs/search-index.json b/docs/search-index.json
index 167022ef..352ed56d 100644
--- a/docs/search-index.json
+++ b/docs/search-index.json
@@ -1,1 +1,1 @@
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\ No newline at end of file
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This operation will always occur after resizing and extraction, if a","k":"extend pad extrude edges background colour pixels derived operation resizing extraction","l":"/api-resize#extend"},{"t":"extract","d":"Extract/crop a region of the image.","k":"extract crop region left top width height","l":"/api-resize#extract"},{"t":"trim","d":"Trim pixels from all edges that contain values similar to the given background colour, which defaults to that of the top-left pixel.","k":"trim pixels edges contain similar background colour defaults top left pixel threshold line art","l":"/api-resize#trim"},{"t":"composite","d":"Composite images over the processed resized, extracted etc. image.","k":"composite images processed resized extracted","l":"/api-composite#composite"},{"t":"rotate","d":"Rotate the output image by either an explicit angle or auto-orient based on the EXIF Orientation tag.","k":"rotate output explicit angle auto orient exif orientation tag background","l":"/api-operation#rotate"},{"t":"flip","d":"Mirror the image vertically up-down about the x-axis. This always occurs before rotation, if any.","k":"flip mirror vertically down axis rotation","l":"/api-operation#flip"},{"t":"flop","d":"Mirror the image horizontally left-right about the y-axis. This always occurs before rotation, if any.","k":"flop mirror horizontally left right axis rotation","l":"/api-operation#flop"},{"t":"affine","d":"Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.","k":"affine transform operation resizing extraction rotation background idx idy odx ody interpolator","l":"/api-operation#affine"},{"t":"sharpen","d":"Sharpen the image.","k":"sharpen sigma","l":"/api-operation#sharpen"},{"t":"median","d":"Apply median filter. When used without parameters the default window is 3x3.","k":"median apply filter parameters window","l":"/api-operation#median"},{"t":"blur","d":"Blur the image.","k":"blur sigma precision min amplitude","l":"/api-operation#blur"},{"t":"flatten","d":"Merge alpha transparency channel, if any, with a background, then remove the alpha channel.","k":"flatten merge alpha transparency channel background remove","l":"/api-operation#flatten"},{"t":"unflatten","d":"Ensure the image has an alpha channel with all white pixel values made fully transparent.","k":"unflatten alpha channel white pixel made fully transparent","l":"/api-operation#unflatten"},{"t":"gamma","d":"Apply a gamma correction by reducing the encoding darken pre-resize at a factor of 1/gamma then increasing the encoding brighten post-resize at a factor of gamma. This can improve the perceived brigh","k":"gamma apply correction reducing encoding darken resize factor increasing brighten post improve perceived brigh alpha","l":"/api-operation#gamma"},{"t":"normalise","d":"Enhance output image contrast by stretching its luminance to cover a full dynamic range.","k":"normalise enhance output contrast stretching luminance cover full dynamic range lower upper","l":"/api-operation#normalise"},{"t":"normalize","d":"Alternative spelling of normalise.","k":"normalize normalise lower upper","l":"/api-operation#normalize"},{"t":"clahe","d":"Perform contrast limiting adaptive histogram equalization CLAHE.","k":"clahe contrast limiting adaptive histogram equalization width height max slope","l":"/api-operation#clahe"},{"t":"convolve","d":"Convolve the image with the specified kernel.","k":"convolve kernel","l":"/api-operation#convolve"},{"t":"threshold","d":"Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.","k":"threshold pixel greater equal otherwise greyscale grayscale raw","l":"/api-operation#threshold"},{"t":"recomb","d":"Recombine the image with the specified matrix.","k":"recomb recombine matrix","l":"/api-operation#recomb"},{"t":"modulate","d":"Transforms the image using brightness, saturation, hue rotation, and lightness. Brightness and lightness both operate on luminance, with the difference being that brightness is multiplicative whereas","k":"modulate transforms brightness saturation hue rotation lightness operate luminance difference being multiplicative whereas","l":"/api-operation#modulate"},{"t":"removeAlpha","d":"Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel.","k":"removealpha remove alpha channel","l":"/api-channel#removealpha"},{"t":"ensureAlpha","d":"Ensure the output image has an alpha transparency channel. If missing, the added alpha channel will have the specified transparency level, defaulting to fully-opaque 1. This is a no-op if the image a","k":"ensurealpha output alpha transparency channel missing added level defaulting fully opaque","l":"/api-channel#ensurealpha"},{"t":"extractChannel","d":"Extract a single channel from a multi-channel image.","k":"extractchannel extract single channel multi","l":"/api-channel#extractchannel"},{"t":"joinChannel","d":"Join one or more channels to the image. The meaning of the added channels depends on the output colourspace, set with toColourspace. By default the output image will be web-friendly sRGB, with additi","k":"joinchannel join channels added depends output colourspace tocolourspace web friendly srgb additi","l":"/api-channel#joinchannel"},{"t":"tint","d":"Tint the image using the provided colour. An alpha channel may be present and will be unchanged by the operation.","k":"tint colour alpha channel present unchanged operation","l":"/api-colour#tint"},{"t":"greyscale","d":"Convert to 8-bit greyscale 256 shades of grey. This is a linear operation. If the input image is in a non-linear colour space such as sRGB, use gamma with greyscale for the best results. By default t","k":"greyscale convert bit shades grey linear operation input colour space srgb gamma results","l":"/api-colour#greyscale"},{"t":"grayscale","d":"Alternative spelling of greyscale.","k":"grayscale greyscale","l":"/api-colour#grayscale"},{"t":"pipelineColorspace","d":"Alternative spelling of pipelineColourspace.","k":"","l":"/api-colour#pipelinecolorspace"},{"t":"versions","d":"An Object containing the version numbers of sharp, libvips and when using prebuilt binaries its dependencies.","k":"versions object version numbers libvips prebuilt binaries dependencies","l":"/api-utility#versions"},{"t":"interpolators","d":"An Object containing the available interpolators and their proper values","k":"interpolators object","l":"/api-utility#interpolators"},{"t":"queue","d":"An EventEmitter that emits a change event when a task is either - queued, waiting for _libuv_ to provide a worker thread - complete","k":"queue eventemitter emits change event queued waiting libuv worker thread complete","l":"/api-utility#queue"},{"t":"cache","d":"Gets or, when options are provided, sets the limits of _libvips_ operation cache. Existing entries in the cache will be trimmed after any change in limits. This method always returns cache statistics","k":"cache limits libvips operation existing entries trimmed change method returns statistics memory files items","l":"/api-utility#cache"},{"t":"concurrency","d":"Gets or, when a concurrency is provided, sets the maximum number of threads _libvips_ should use to process _each image_. These are from a thread pool managed by glib, which helps avoid the overhead","k":"concurrency maximum number threads libvips process thread pool managed glib avoid overhead","l":"/api-utility#concurrency"},{"t":"counters","d":"Provides access to internal task counters. - queue is the number of tasks this module has queued waiting for _libuv_ to provide a worker thread from its pool. - process is the number of resize tasks","k":"counters provides access internal queue number tasks module queued waiting libuv worker thread pool process resize","l":"/api-utility#counters"},{"t":"simd","d":"Get and set use of SIMD vector unit instructions. Requires libvips to have been compiled with highway support.","k":"simd vector unit instructions libvips compiled highway","l":"/api-utility#simd"},{"t":"block","d":"Block libvips operations at runtime.","k":"block libvips operations runtime operation","l":"/api-utility#block"},{"t":"unblock","d":"Unblock libvips operations at runtime.","k":"unblock libvips operations runtime operation","l":"/api-utility#unblock"}]
\ No newline at end of file
diff --git a/lib/constructor.js b/lib/constructor.js
index 0bc16cd1..41f78020 100644
--- a/lib/constructor.js
+++ b/lib/constructor.js
@@ -227,6 +227,7 @@ const Sharp = function (input, options) {
     medianSize: 0,
     blurSigma: 0,
     precision: 'integer',
+    minAmpl: 0.2,
     sharpenSigma: 0,
     sharpenM1: 1,
     sharpenM2: 2,
diff --git a/lib/index.d.ts b/lib/index.d.ts
index b527510b..90a24be9 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -1347,6 +1347,8 @@ declare namespace sharp {
     interface BlurOptions {
         /** A value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2` */
         sigma: number;
+        /** A value between 0.001 and 1. A smaller value will generate a larger, more accurate mask. */
+        minAmplitude?: number;
         /** How accurate the operation should be, one of: integer, float, approximate. (optional, default "integer") */
         precision?: Precision | undefined;
     }
diff --git a/lib/operation.js b/lib/operation.js
index 55964ee9..c47fbadf 100644
--- a/lib/operation.js
+++ b/lib/operation.js
@@ -381,6 +381,7 @@ function median (size) {
  * @param {Object|number|Boolean} [options]
  * @param {number} [options.sigma] a value between 0.3 and 1000 representing the sigma of the Gaussian mask, where `sigma = 1 + radius / 2`.
  * @param {string} [options.precision='integer'] How accurate the operation should be, one of: integer, float, approximate.
+ * @param {number} [options.minAmplitude=0.2] A value between 0.001 and 1. A smaller value will generate a larger, more accurate mask.
  * @returns {Sharp}
  * @throws {Error} Invalid parameters
  */
@@ -400,6 +401,13 @@ function blur (options) {
         throw is.invalidParameterError('precision', 'one of: integer, float, approximate', options.precision);
       }
     }
+    if ('minAmplitude' in options) {
+      if (is.number(options.minAmplitude) && is.inRange(options.minAmplitude, 0.001, 1)) {
+        this.options.minAmpl = options.minAmplitude;
+      } else {
+        throw is.invalidParameterError('minAmplitude', 'number between 0.001 and 1', options.minAmplitude);
+      }
+    }
   }
 
   if (!is.defined(options)) {
diff --git a/src/operations.cc b/src/operations.cc
index 2d8c9060..775f6134 100644
--- a/src/operations.cc
+++ b/src/operations.cc
@@ -144,7 +144,7 @@ namespace sharp {
   /*
    * Gaussian blur. Use sigma of -1.0 for fast blur.
    */
-  VImage Blur(VImage image, double const sigma, VipsPrecision precision) {
+  VImage Blur(VImage image, double const sigma, VipsPrecision precision, double const minAmpl) {
     if (sigma == -1.0) {
       // Fast, mild blur - averages neighbouring pixels
       VImage blur = VImage::new_matrixv(3, 3,
@@ -156,7 +156,8 @@ namespace sharp {
     } else {
       // Slower, accurate Gaussian blur
       return StaySequential(image).gaussblur(sigma, VImage::option()
-        ->set("precision", precision));
+        ->set("precision", precision)
+        ->set("min_ampl", minAmpl));
     }
   }
 
diff --git a/src/operations.h b/src/operations.h
index 39e3ad58..b2881d65 100644
--- a/src/operations.h
+++ b/src/operations.h
@@ -47,7 +47,7 @@ namespace sharp {
   /*
    * Gaussian blur. Use sigma of -1.0 for fast blur.
    */
-  VImage Blur(VImage image, double const sigma, VipsPrecision precision);
+  VImage Blur(VImage image, double const sigma, VipsPrecision precision, double const minAmpl);
 
   /*
    * Convolution with a kernel.
diff --git a/src/pipeline.cc b/src/pipeline.cc
index dc31121d..fafd695c 100644
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -592,7 +592,7 @@ class PipelineWorker : public Napi::AsyncWorker {
 
       // Blur
       if (shouldBlur) {
-        image = sharp::Blur(image, baton->blurSigma, baton->precision);
+        image = sharp::Blur(image, baton->blurSigma, baton->precision, baton->minAmpl);
       }
 
       // Unflatten the image
@@ -1542,6 +1542,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   baton->negateAlpha = sharp::AttrAsBool(options, "negateAlpha");
   baton->blurSigma = sharp::AttrAsDouble(options, "blurSigma");
   baton->precision = sharp::AttrAsEnum<VipsPrecision>(options, "precision", VIPS_TYPE_PRECISION);
+  baton->minAmpl = sharp::AttrAsDouble(options, "minAmpl");
   baton->brightness = sharp::AttrAsDouble(options, "brightness");
   baton->saturation = sharp::AttrAsDouble(options, "saturation");
   baton->hue = sharp::AttrAsInt32(options, "hue");
diff --git a/src/pipeline.h b/src/pipeline.h
index 2f541219..777a4c54 100644
--- a/src/pipeline.h
+++ b/src/pipeline.h
@@ -79,6 +79,7 @@ struct PipelineBaton {
   bool negateAlpha;
   double blurSigma;
   VipsPrecision precision;
+  double minAmpl;
   double brightness;
   double saturation;
   int hue;


Test patch:
diff --git a/test/types/sharp.test-d.ts b/test/types/sharp.test-d.ts
index 3e6902cf..80c9f2ab 100644
--- a/test/types/sharp.test-d.ts
+++ b/test/types/sharp.test-d.ts
@@ -63,6 +63,7 @@ sharp().blur();
 sharp().blur(1);
 sharp().blur({ sigma: 1 });
 sharp().blur({ sigma: 1, precision: 'approximate' });
+sharp().blur({ sigma: 1, minAmplitude: 0.8 });
 
 sharp({
   create: {
diff --git a/test/unit/blur.js b/test/unit/blur.js
index 977d6968..facff648 100644
--- a/test/unit/blur.js
+++ b/test/unit/blur.js
@@ -111,6 +111,16 @@ describe('Blur', function () {
     }, /Expected one of: integer, float, approximate for precision but received invalid of type string/);
   });
 
+  it('invalid minAmplitude', function () {
+    assert.throws(function () {
+      sharp(fixtures.inputJpg).blur({ sigma: 1, minAmplitude: 0 });
+    }, /Expected number between 0.001 and 1 for minAmplitude but received 0 of type number/);
+
+    assert.throws(function () {
+      sharp(fixtures.inputJpg).blur({ sigma: 1, minAmplitude: 1.01 });
+    }, /Expected number between 0.001 and 1 for minAmplitude but received 1.01 of type number/);
+  });
+
   it('specific radius 10 and precision approximate', async () => {
     const approximate = await sharp(fixtures.inputJpg)
       .resize(320, 240)
@@ -125,6 +135,20 @@ describe('Blur', function () {
     await fixtures.assertSimilar(fixtures.expected('blur-10.jpg'), approximate);
   });
 
+  it('specific radius 10 and minAmplitude 0.01', async () => {
+    const minAmplitudeLow = await sharp(fixtures.inputJpg)
+      .resize(320, 240)
+      .blur({ sigma: 10, minAmplitude: 0.01 })
+      .toBuffer();
+    const minAmplitudeDefault = await sharp(fixtures.inputJpg)
+      .resize(320, 240)
+      .blur(10)
+      .toBuffer();
+
+    assert.notDeepEqual(minAmplitudeLow, minAmplitudeDefault);
+    await fixtures.assertSimilar(fixtures.expected('blur-10.jpg'), minAmplitudeLow);
+  });
+
   it('options.sigma is required if options object is passed', function () {
     assert.throws(function () {
       sharp(fixtures.inputJpg).blur({ precision: 'invalid' });