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img2img not working with DDIM trailing or TCD #663

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wbruna opened this issue Apr 23, 2025 · 0 comments · May be fixed by #665
Open

img2img not working with DDIM trailing or TCD #663

wbruna opened this issue Apr 23, 2025 · 0 comments · May be fixed by #665

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@wbruna
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wbruna commented Apr 23, 2025

This is on master-10c6501:

  1. ./sd --model SD/cyberrealisticSemi_v30.safetensors -W 384 --seed 1 -p 'red shirt' --sampling-method ddim_trailing -o base.png to create the base image (just to be sure DDIM itself is working)
  2. ./sd --model SD/cyberrealisticSemi_v30.safetensors -W 384 --seed 1 -p 'pink shirt' --mode img2img -i base.png --strength 0.1 --sampling-method euler -o i2i_euler_s1.png
  3. ./sd --model SD/cyberrealisticSemi_v30.safetensors -W 384 --seed 1 -p 'pink shirt' --mode img2img -i base.png --strength 0.6 --sampling-method euler -o i2i_euler_s6.png
  4. ./sd --model SD/cyberrealisticSemi_v30.safetensors -W 384 --seed 1 -p 'pink shirt' --mode img2img -i base.png --strength 0.1 --sampling-method tcd -o i2i_tcd_s1.png
  5. ./sd --model SD/cyberrealisticSemi_v30.safetensors -W 384 --seed 1 -p 'pink shirt' --mode img2img -i base.png --strength 0.6 --sampling-method ddim_trailing -o i2i_ddim_s6.png
base i2i_euler_s1 i2i_euler_s6 i2i_tcd_s1 i2i_ddim_s6
base.png i2i_euler_s1 i2i_euler_s6.png i2i_tcd_s1 i2i_ddim_s6.png

Both TCD and DDIM produce pretty much the same results for the same number of steps.

@yslai , any ideas?
@wbruna wbruna linked a pull request Apr 24, 2025 that will close this issue
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fix: adjust timestep calculations for DDIM and TCD wbruna/stable-diffusion.cpp
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