scraed d82b218e1c Add a Qwen-Image 2.1 image edit example with a LanPaint mask ...

This is the official `Qwen Image 2.1 Image Edit` graph - a `TextEncodeQwenImage21`
fed through its autogrow `images` input, with the prompt naming the references as
`<image1>` / `<image2>` - carrying a LanPaint mask.

Three changes against the stock template: `LanPaint_ImageEncode` takes the mask,
`LanPaint_KSampler` does the sampling, and `LanPaint_ImageDecode` merges the result
back inside the mask and keeps RGBA. No new node inputs or outputs.

The demo re-surfaces a pair of headphones' earcups with the iridescent titanium of a
second reference image. The mask is 14.8% of the frame and 89% of it sits on the
headphones; outside the mask the output is pixel-identical to the source (mean
channel difference 0.098/255), so the headband, the stitching and the hinges are
untouched rather than merely similar. The source and the result are both RGBA.

`Text Encode Qwen Image 2.1` is the right reference encoder for transparent pictures:
it hands the vision tower the alpha composited over white and encodes all four
channels into the reference latent, where the older `Text Encode Qwen Image Edit Plus`
trims to RGB.

Verified by replaying the API prompt embedded in the packaged PNG against the shipped
input files: bit-identical output. The README gets the news block, a TOC entry, the
example section and an Updates line; the previous 2.1 heading now says "with
Transparency" so the two 2.1 examples are distinguishable.

2026-09-28 14:38:33 +08:00

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