Ensure withMetadata can add RGB16 profiles #3773

Author: lovell

docs/changelog.md

@@ -9,7 +9,10 @@ Requires libvips v8.14.4
 * Ensure composite tile images are fully decoded (regression in 0.32.0).
   [#3767](https://github.com/lovell/sharp/issues/3767)
 
-* Ensure `withMetadata` does not add default sRGB profile to RGB16 (regression in 0.32.5).
+* Ensure `withMetadata` can add ICC profiles to RGB16 output.
+  [#3773](https://github.com/lovell/sharp/issues/3773)
+
+* Ensure `withMetadata` does not reduce 16-bit images to 8-bit (regression in 0.32.5).
   [#3773](https://github.com/lovell/sharp/issues/3773)
 
 ### v0.32.5 - 15th August 2023

src/pipeline.cc

@@ -326,7 +326,7 @@ class PipelineWorker : public Napi::AsyncWorker {
         try {
           image = image.icc_transform(processingProfile, VImage::option()
             ->set("embedded", TRUE)
-            ->set("depth", image.interpretation() == VIPS_INTERPRETATION_RGB16 ? 16 : 8)
+            ->set("depth", sharp::Is16Bit(image.interpretation()) ? 16 : 8)
             ->set("intent", VIPS_INTENT_PERCEPTUAL));
         } catch(...) {
           sharp::VipsWarningCallback(nullptr, G_LOG_LEVEL_WARNING, "Invalid embedded profile", nullptr);
@@ -763,6 +763,7 @@ class PipelineWorker : public Napi::AsyncWorker {
         if (baton->withMetadata && sharp::HasProfile(image) && baton->withMetadataIcc.empty()) {
           image = image.icc_transform("srgb", VImage::option()
             ->set("embedded", TRUE)
+            ->set("depth", sharp::Is16Bit(image.interpretation()) ? 16 : 8)
             ->set("intent", VIPS_INTENT_PERCEPTUAL));
         }
       }
@@ -789,14 +790,13 @@ class PipelineWorker : public Napi::AsyncWorker {
 
       // Apply output ICC profile
       if (baton->withMetadata) {
-        if (image.interpretation() == VIPS_INTERPRETATION_sRGB || !baton->withMetadataIcc.empty()) {
-          image = image.icc_transform(
-            baton->withMetadataIcc.empty() ? "srgb" : const_cast<char*>(baton->withMetadataIcc.data()),
-            VImage::option()
-              ->set("input_profile", processingProfile)
-              ->set("embedded", TRUE)
-              ->set("intent", VIPS_INTENT_PERCEPTUAL));
-        }
+        image = image.icc_transform(
+          baton->withMetadataIcc.empty() ? "srgb" : const_cast<char*>(baton->withMetadataIcc.data()),
+          VImage::option()
+            ->set("input_profile", processingProfile)
+            ->set("embedded", TRUE)
+            ->set("depth", sharp::Is16Bit(image.interpretation()) ? 16 : 8)
+            ->set("intent", VIPS_INTENT_PERCEPTUAL));
       }
       // Override EXIF Orientation tag
       if (baton->withMetadata && baton->withMetadataOrientation != -1) {

test/unit/metadata.js

@@ -794,15 +794,40 @@ describe('Image metadata', function () {
     assert.strictEqual(intent, 'Perceptual');
   });
 
-  it('withMetadata does not add default sRGB profile to RGB16', async () => {
-    const data = await sharp(fixtures.inputJpg)
-      .resize(32, 24)
+  it('withMetadata adds default sRGB profile to RGB16', async () => {
+    const data = await sharp({
+      create: {
+        width: 8, height: 8, channels: 4, background: 'orange'
+      }
+    })
       .toColorspace('rgb16')
+      .png()
       .withMetadata()
       .toBuffer();
 
     const metadata = await sharp(data).metadata();
-    assert.strictEqual(undefined, metadata.icc);
+    assert.strictEqual(metadata.depth, 'ushort');
+
+    const { description } = icc.parse(metadata.icc);
+    assert.strictEqual(description, 'sRGB');
+  });
+
+  it('withMetadata adds P3 profile to 16-bit PNG', async () => {
+    const data = await sharp({
+      create: {
+        width: 8, height: 8, channels: 4, background: 'orange'
+      }
+    })
+      .toColorspace('rgb16')
+      .png()
+      .withMetadata({ icc: 'p3' })
+      .toBuffer();
+
+    const metadata = await sharp(data).metadata();
+    assert.strictEqual(metadata.depth, 'ushort');
+
+    const { description } = icc.parse(metadata.icc);
+    assert.strictEqual(description, 'sP3C');
   });
 
   it('File input with corrupt header fails gracefully', function (done) {