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scraed-LanPaint/example_workflows/Transparent_Edit_EncodeDecode_Inpaint.json
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scraed f564ee886b Add the Qwen-Image 2.1 example with transparent-background inpainting 
LanPaint runs on Qwen-Image 2.1 unchanged: it is a rectified-flow model, so the
existing Flux/Qwen-Image conversions apply. Example_31 uses a text-to-image render
of its own model as the before/after, generated with a transparent background, and
keeps the inpainting mask in a separate greyscale file rather than in the picture's
alpha - 2.1's alpha channel means transparency, so overloading it would make the
two indistinguishable.

The transparency is carried into the latent and edited along with the pixels: the
2.1 VAE is 4-in/4-out (encoder.conv1 takes 4 channels, the decoder head emits 4),
and LoadImage's MASK output re-attaches through Join Image With Alpha, since that
mask is already 1 - alpha. The rebuilt sole grows past the old outline, so the
alpha in that region is generated rather than copied.

LanPaint_ImageDecode now matches the decoded channels to the source image: the 2.1
VAE always emits a 4th channel, which the merge could not broadcast. It keeps the
input's channel count, so an RGBA source comes back RGBA and an RGB source still
comes back RGB.
2026-09-28 00:25:23 +08:00

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"the boot's sole and forefoot replaced by a sleek futuristic mechanical unit: segmented brushed titanium plating with fine panel lines, glowing cyan energy strips along the flanks, a sculpted dark carbon-fibre heel block, precise engineered details and tiny bolts, the brown leather upper above stays exactly as it is, high-end sci-fi product photography, transparent background"
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"## Qwen-Image 2.1 + LanPaint, editing a transparent-background image\n\n**The point of this example** - the source already has an alpha channel, and the\nedit is allowed to change it. The rebuilt sole gets a *new* silhouette (it grows\npast the old outline), so transparency is being generated, not copied.\n\n**1. Why `Join Image With Alpha`** - `Load Image` never puts alpha on the IMAGE; it\nhands it out on its MASK output instead. The Qwen 2.1 VAE takes 4 channels natively\n(`encoder.conv1` wants 4), so the alpha has to be re-attached as the 4th channel\nbefore encoding. Note `Load Image`'s MASK is **1 - alpha** (1 = transparent), so it\ndrops straight into `Join Image With Alpha.alpha` without an invert - the 4th\nchannel then matches the file's own alpha and comes back untouched outside the mask.\n\n**2. The mask is a separate greyscale file** - white = rebuild. Keep it modest: this\nexample uses about 16% of the frame. LanPaint anchors everything outside the mask to\nthe ground truth each step, so a mask that swallows most of the picture leaves the\nmodel without context - past roughly a third of the frame the result turns to\nblotches and the alpha starts growing a halo.\n\n**3. Output** - `LanPaint_ImageDecode` keeps the channel count of the input image, so\nan RGBA source comes back RGBA. An RGB source still comes back RGB.\n\nModels: `qwen_image_2.1_int8_convrot` + `qwen3vl_8b_int8_convrot` + `qwen_image_2.1_vae_bf16`."
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