docs: Deliver images with a better quality (and larger size)

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/src/backend/util.py b/src/backend/util.py
index 4f85b7408240d62eb4d25cd85738d74f05f6a30e..9afc6e67a2665021466df160869cc3c95405edef 100644 (file)
--- a/src/backend/util.py
+++ b/src/backend/util.py
@@ -206,7 +206,7 @@ def normalize(s):
 
        return "-".join(s.split())
 
-def generate_thumbnail(image, size, square=False, format=None, **args):
+def generate_thumbnail(image, size, square=False, format=None, quality=None, **args):
        assert image, "No image data received"
 
        if not isinstance(image, PIL.Image.Image):
@@ -271,17 +271,17 @@ def generate_thumbnail(image, size, square=False, format=None, **args):
        # Arguments to optimise the compression
        args.update({
                "subsampling" : "4:2:0",
-               "quality"     : 72,
+               "quality"     : quality or 72,
        })
 
        if image.format == "JPEG":
                args.update({
-                       "qtables"      : "web_low",
+                       "qtables" : "web_low",
                })
 
        elif image.format == "WEBP":
                args.update({
-                       "lossless"    : False,
+                       "lossless" : False,
                })
 
        with io.BytesIO() as f:

diff --git a/src/backend/wiki.py b/src/backend/wiki.py
index 349a94d08b3b76324f518eb471a86da4c6813b11..caacf702cc4476c6e458d4e59cd7a642846c7c6f 100644 (file)
--- a/src/backend/wiki.py
+++ b/src/backend/wiki.py
@@ -704,7 +704,7 @@ class File(misc.Object):
                        return thumbnail
 
                # Generate the thumbnail
-               thumbnail = util.generate_thumbnail(self.blob, size, format=format)
+               thumbnail = util.generate_thumbnail(self.blob, size, format=format, quality=95)
 
                # Put it into the cache for forever
                await self.backend.cache.set(cache_key, thumbnail)