diff --git a/publish/deno.jsonc b/publish/deno.jsonc
index 49b797b..9308dc7 100644
--- a/publish/deno.jsonc
+++ b/publish/deno.jsonc
@@ -3,7 +3,7 @@
     "publish": "deno run --env-file=../.env.local --allow-env --allow-read --allow-write=./logs --allow-net --allow-run=git src/cli.ts publish",
     "check": "deno run --env-file=../.env.local --allow-env --allow-read --allow-net src/cli.ts check",
     "validate-post": "deno run --allow-read src/cli.ts validate-post",
-    "test": "deno test --allow-env --allow-read --allow-net --allow-run",
+    "test": "deno test --allow-env --allow-read --allow-write --allow-net --allow-run",
     "fmt": "deno fmt",
     "lint": "deno lint"
   },
diff --git a/publish/src/core/image-collector.ts b/publish/src/core/image-collector.ts
new file mode 100644
index 0000000..1c3871c
--- /dev/null
+++ b/publish/src/core/image-collector.ts
@@ -0,0 +1,45 @@
+import { extname, join } from '@std/path'
+
+const IMG_EXTS = new Set(['.png', '.jpg', '.jpeg', '.gif', '.webp', '.svg'])
+
+const MIME_MAP: Record<string, string> = {
+  '.png': 'image/png',
+  '.jpg': 'image/jpeg',
+  '.jpeg': 'image/jpeg',
+  '.gif': 'image/gif',
+  '.webp': 'image/webp',
+  '.svg': 'image/svg+xml',
+}
+
+const HUGO_DERIVATIVE = /_hu_[0-9a-f]+\./
+
+export function mimeFromExt(filename: string): string {
+  return MIME_MAP[extname(filename).toLowerCase()] ?? 'application/octet-stream'
+}
+
+export interface ImageFile {
+  fileName: string
+  absolutePath: string
+  data: Uint8Array
+  mimeType: string
+}
+
+export async function collectImages(postDir: string): Promise<ImageFile[]> {
+  const results: ImageFile[] = []
+  for await (const entry of Deno.readDir(postDir)) {
+    if (!entry.isFile) continue
+    if (HUGO_DERIVATIVE.test(entry.name)) continue
+    const ext = extname(entry.name).toLowerCase()
+    if (!IMG_EXTS.has(ext)) continue
+    const abs = join(postDir, entry.name)
+    const data = await Deno.readFile(abs)
+    results.push({
+      fileName: entry.name,
+      absolutePath: abs,
+      data,
+      mimeType: mimeFromExt(entry.name),
+    })
+  }
+  results.sort((a, b) => a.fileName.localeCompare(b.fileName))
+  return results
+}
diff --git a/publish/tests/image-collector_test.ts b/publish/tests/image-collector_test.ts
new file mode 100644
index 0000000..1b86b4b
--- /dev/null
+++ b/publish/tests/image-collector_test.ts
@@ -0,0 +1,27 @@
+import { assertEquals } from '@std/assert'
+import { collectImages, mimeFromExt } from '../src/core/image-collector.ts'
+
+Deno.test('mimeFromExt: erkennt gängige formate', () => {
+  assertEquals(mimeFromExt('a.png'), 'image/png')
+  assertEquals(mimeFromExt('a.jpg'), 'image/jpeg')
+  assertEquals(mimeFromExt('a.jpeg'), 'image/jpeg')
+  assertEquals(mimeFromExt('a.gif'), 'image/gif')
+  assertEquals(mimeFromExt('a.webp'), 'image/webp')
+  assertEquals(mimeFromExt('a.svg'), 'image/svg+xml')
+})
+
+Deno.test('collectImages: liest alle bild-dateien im ordner, ignoriert hugo-derivate', async () => {
+  const tmp = await Deno.makeTempDir()
+  try {
+    await Deno.writeTextFile(`${tmp}/index.md`, '# hi')
+    await Deno.writeFile(`${tmp}/a.png`, new Uint8Array([1]))
+    await Deno.writeFile(`${tmp}/b.jpg`, new Uint8Array([2]))
+    await Deno.writeFile(`${tmp}/a_hu_deadbeef.png`, new Uint8Array([3]))
+    await Deno.writeTextFile(`${tmp}/notes.txt`, 'ignore me')
+    const imgs = await collectImages(tmp)
+    assertEquals(imgs.map((i) => i.fileName).sort(), ['a.png', 'b.jpg'])
+    assertEquals(imgs.find((i) => i.fileName === 'a.png')?.mimeType, 'image/png')
+  } finally {
+    await Deno.remove(tmp, { recursive: true })
+  }
+})