Add option to include default sRGB profile for RGB colors

tests/test_api.py

@@ -521,6 +521,16 @@ def test_partial_pdf_custom_metadata():
     assert b'value' in stdout
 
 
+def test_pdf_srgb():
+    stdout = _run('--srgb --uncompressed-pdf - -', b'test')
+    assert b'sRGB' in stdout
+
+
+def test_pdf_no_srgb():
+    stdout = _run('--uncompressed-pdf - -', b'test')
+    assert b'sRGB' not in stdout
+
+
 @pytest.mark.parametrize('html, fields', (
     ('<input>', ['/Tx', '/V ()']),
     ('<input value="">', ['/Tx', '/V ()']),

weasyprint/__init__.py

@@ -45,6 +45,9 @@ VERSION = __version__ = '62.3'
 #:     Whether custom HTML metadata should be stored in the generated PDF.
 #: :param bool presentational_hints:
 #:     Whether HTML presentational hints are followed.
+#: :param bool srgb:
+#:     Whether sRGB color profile should be included and set as default for
+#:     device-dependant RGB colors.
 #: :param bool optimize_images:
 #:     Whether size of embedded images should be optimized, with no quality
 #:     loss.
@@ -71,6 +74,7 @@ DEFAULT_OPTIONS = {
     'uncompressed_pdf': False,
     'custom_metadata': False,
     'presentational_hints': False,
+    'srgb': False,
     'optimize_images': False,
     'jpeg_quality': None,
     'dpi': None,

weasyprint/__main__.py

@@ -98,6 +98,9 @@ PARSER.add_argument(
 PARSER.add_argument(
     '-p', '--presentational-hints', action='store_true',
     help='follow HTML presentational hints')
+PARSER.add_argument(
+    '--srgb', action='store_true',
+    help='include sRGB color profile')
 PARSER.add_argument(
     '--optimize-images', action='store_true',
     help='optimize size of embedded images with no quality loss')

weasyprint/pdf/__init__.py

@@ -1,5 +1,7 @@
 """PDF generation management."""
 
+from importlib.resources import files
+
 import pydyf
 
 from .. import VERSION, Attachment
@@ -116,11 +118,14 @@ def generate_pdf(document, target, zoom, **options):
 
     # Set properties according to PDF variants
     mark = False
+    srgb = options['srgb']
     variant = options['pdf_variant']
     if variant:
         variant_function, properties = VARIANTS[variant]
         if 'mark' in properties:
             mark = properties['mark']
+        if 'srgb' in properties:
+            srgb = properties['srgb']
 
     pdf = pydyf.PDF()
     states = pydyf.Dictionary()
@@ -294,6 +299,22 @@ def generate_pdf(document, target, zoom, **options):
             pdf.catalog['Names'] = pydyf.Dictionary()
         pdf.catalog['Names']['Dests'] = dests
 
+    if srgb:
+        # Add ICC profile.
+        profile = pydyf.Stream(
+            [(files(__package__) / 'sRGB2014.icc').read_bytes()],
+            pydyf.Dictionary({'N': 3, 'Alternate': '/DeviceRGB'}),
+            compress=compress)
+        pdf.add_object(profile)
+        pdf.catalog['OutputIntents'] = pydyf.Array([
+            pydyf.Dictionary({
+                'Type': '/OutputIntent',
+                'S': '/GTS_PDFA1',
+                'OutputConditionIdentifier': pydyf.String('sRGB IEC61966-2.1'),
+                'DestOutputProfile': profile.reference,
+            }),
+        ])
+
     # Apply PDF variants functions
     if variant:
         variant_function(

weasyprint/pdf/pdfa.py

@@ -1,15 +1,5 @@
 """PDF/A generation."""
 
-try:
-    # Available in Python 3.9+
-    from importlib.resources import files
-except ImportError:
-    # Deprecated in Python 3.11+
-    from importlib.resources import read_binary
-else:
-    def read_binary(package, resource):
-        return (files(package) / resource).read_bytes()
-
 from functools import partial
 
 import pydyf
@@ -20,20 +10,6 @@ from .metadata import add_metadata
 def pdfa(pdf, metadata, document, page_streams, attachments, compress,
          version, variant):
     """Set metadata for PDF/A documents."""
-    # Add ICC profile.
-    profile = pydyf.Stream(
-        [read_binary(__package__, 'sRGB2014.icc')],
-        pydyf.Dictionary({'N': 3, 'Alternate': '/DeviceRGB'}),
-        compress=compress)
-    pdf.add_object(profile)
-    pdf.catalog['OutputIntents'] = pydyf.Array([
-        pydyf.Dictionary({
-            'Type': '/OutputIntent',
-            'S': '/GTS_PDFA1',
-            'OutputConditionIdentifier': pydyf.String('sRGB IEC61966-2.1'),
-            'DestOutputProfile': profile.reference,
-        }),
-    ])
 
     # Handle attachments.
     if version == 1:
@@ -95,23 +71,23 @@ def pdfa(pdf, metadata, document, page_streams, attachments, compress,
 VARIANTS = {
     'pdf/a-1b': (
         partial(pdfa, version=1, variant='B'),
-        {'version': '1.4', 'identifier': True}),
+        {'version': '1.4', 'identifier': True, 'srgb': True}),
     'pdf/a-2b': (
         partial(pdfa, version=2, variant='B'),
-        {'version': '1.7', 'identifier': True}),
+        {'version': '1.7', 'identifier': True, 'srgb': True}),
     'pdf/a-3b': (
         partial(pdfa, version=3, variant='B'),
-        {'version': '1.7', 'identifier': True}),
+        {'version': '1.7', 'identifier': True, 'srgb': True}),
     'pdf/a-4b': (
         partial(pdfa, version=4, variant='B'),
-        {'version': '2.0', 'identifier': True}),
+        {'version': '2.0', 'identifier': True, 'srgb': True}),
     'pdf/a-2u': (
         partial(pdfa, version=2, variant='U'),
-        {'version': '1.7', 'identifier': True}),
+        {'version': '1.7', 'identifier': True, 'srgb': True}),
     'pdf/a-3u': (
         partial(pdfa, version=3, variant='U'),
-        {'version': '1.7', 'identifier': True}),
+        {'version': '1.7', 'identifier': True, 'srgb': True}),
     'pdf/a-4u': (
         partial(pdfa, version=4, variant='U'),
-        {'version': '2.0', 'identifier': True}),
+        {'version': '2.0', 'identifier': True, 'srgb': True}),
 }