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bflatasticandClaude Opus 5.5 54427d7a92 M3.74: blending inside a group reaches the art below unless the group isolates it
On screen, a group (or object) with opacity, a blend mode, an opacity mask or
knockout whose content blends is drawn offscreen over a copy of its backdrop
and mixed back in by its opacity, mask and clip (a group blend mode then
applies to the backdrop-free result, as PDF defines it). Isolate Blending keeps
the content starting from transparency. Clip groups no longer isolate their
children (blending content is clipped per drawing), and non-isolated knockout
groups composite their elements against the art below the group. Groups
without blending inside still render as plain layers.

In PDF, such groups are written as non-isolated transparency groups (a
constant-alpha soft mask instead of the writer's isolated opacity group),
knockout groups included.

doc: Node::blends_through / children_blend.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-05 00:27:31 +07:00
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