mirror of
https://github.com/heygen-com/hyperframes.git
synced 2026-09-13 07:40:06 +00:00
Miguel Ángel
9734578e60
Restores the 208 catalog items reverted after their previews 404'd in production, this time on the payload mechanism rather than the .html files that caused the outage. The generator no longer writes a preview document to docs/public. That writer, and the machinery under it, existed only to produce files the docs host discards, so it is gone rather than bypassed. Items now embed the composition itself via a payload, which is what the previous change already does for the items that were already in the catalog. The variables explorer is parked, not restored: it drove its preview through the same unpublished .html path, so it would have shown an empty frame. Items that declare variables get the live player plus the static variables table, and reconnecting the explorer to payloads is a follow-up.
121 lines
4.1 KiB
Plaintext
121 lines
4.1 KiB
Plaintext
---
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title: "Blend Difference"
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description: "Auto-inverting text using mix-blend-mode: difference — flips between white and black per-pixel against the background"
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---
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import { InstallCommand } from "/snippets/install-command.jsx";
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<video className="w-full aspect-video rounded-xl object-cover bg-zinc-100 dark:bg-zinc-800" src="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/components/caption-blend-difference.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/components/caption-blend-difference.png" autoPlay muted loop playsInline />
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## Install
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<InstallCommand command="npx hyperframes add caption-blend-difference" />
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That writes one file: `compositions/components/caption-blend-difference.html`.
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## Source
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<Accordion title={`caption-blend-difference.html`}>
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```html
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<!--
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Blend Difference — auto-inverting captions via mix-blend-mode.
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Text color inverts per-pixel against whatever is behind it:
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white stays white on dark areas, flips to black on light areas.
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On color video, white inverts to the complement (blue → orange,
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red → cyan, green → magenta).
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Setup:
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1. The composition root (or a shared ancestor of both the video
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and the caption layer) MUST have `isolation: isolate` so the
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blend operates against sibling content, not the page background.
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2. Add class="blend-difference" to any caption container.
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3. Set caption text color to white. The blend mode handles the rest.
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Works on any element — divs, spans, SVG text, even images.
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Customize:
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- --blend-caption-color: base text color (default white)
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- Change blend mode via --blend-mode to 'exclusion' for a softer effect
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Variants:
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- .blend-difference → standard per-pixel inversion
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- .blend-difference-soft → exclusion mode, less harsh contrast
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- .blend-difference-screen → text glows on dark, fades on light
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-->
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<style>
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.blend-difference {
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mix-blend-mode: var(--blend-mode, difference);
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color: var(--blend-caption-color, white);
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pointer-events: none;
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}
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.blend-difference-soft {
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mix-blend-mode: exclusion;
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color: var(--blend-caption-color, white);
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pointer-events: none;
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}
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.blend-difference-screen {
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mix-blend-mode: screen;
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color: var(--blend-caption-color, white);
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pointer-events: none;
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}
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</style>
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<!--
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Composition setup example:
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<div data-composition-id="root" ... style="isolation: isolate;">
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<video id="bg" data-start="0" data-duration="30" data-track-index="0"
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src="video.mp4" muted playsinline></video>
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<div class="clip blend-difference" data-start="0" data-duration="5" data-track-index="1"
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style="position: absolute; inset: 0; z-index: 10;
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display: flex; align-items: center; justify-content: center;">
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<span style="font-size: 120px; font-weight: 800; text-transform: uppercase;">
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YOUR CAPTION
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</span>
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</div>
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</div>
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Timeline integration — animate captions normally, blend mode is passive:
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tl.from(".caption", {
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y: 50, opacity: 0, duration: 0.6, ease: "expo.out"
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}, 0.2);
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Notes:
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- isolation: isolate on the composition root is REQUIRED.
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Without it, blend mode composes against the page background
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(usually white or black) and you get no inversion.
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- Works with any GSAP animation — the blend composites every frame.
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- For caption containers with multiple text elements, apply the
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class to the shared parent, not each text element individually.
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- On pure black backgrounds, white text stays white (difference
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of white and black = white). The effect is most visible when
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the background has varied luminance or color.
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-->
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```
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</Accordion>
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## Usage
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Open `compositions/components/caption-blend-difference.html` and paste its contents into your composition. See the comment header in the file for detailed instructions.
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{/* hf:generated-footer */}
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Tagged `text` `text-effect` `effect` `blend-mode` `contrast` `inversion`.
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## Related topics
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- [Browse the complete Catalog](/catalog)
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- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
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- [Build a richer composition](/go-further)
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