fix: Support array sample format (#51)

A floating point image that was saved from PhotoShop sets "SampleFormat" to [3, 3, 3].
image-js · Apr 8, 2024 · 42d778b · 42d778b
1 parent de5d521
commit 42d778b
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Showing 3 changed files with 10 additions and 1 deletion.
diff --git a/img/array-sample-format.tif b/img/array-sample-format.tif
diff --git a/src/__tests__/decode.test.ts b/src/__tests__/decode.test.ts
@@ -157,6 +157,14 @@ const files: TiffFile[] = [
     components: 1,
     alpha: false,
   },
+  {
+    name: 'array-sample-format.tif',
+    width: 2,
+    height: 2,
+    bitsPerSample: 32,
+    components: 3,
+    alpha: false,
+  },
 ];
 const cases = files.map(
   (file) => [file.name, file, readImage(file.name)] as const,

diff --git a/src/tiffIfd.ts b/src/tiffIfd.ts
@@ -121,7 +121,8 @@ export default class TiffIfd extends Ifd {
     return this.get('Predictor') || 1;
   }
   public get sampleFormat(): number {
-    return this.get('SampleFormat') || 1;
+    const data = alwaysArray(this.get('SampleFormat') || 1);
+    return data[0];
   }
   public get sMinSampleValue(): number {
     return this.get('SMinSampleValue') || this.minSampleValue;