## Summary
This PR makes some improvements to the FLUX image-to-image and
inpainting behaviours.
Changes:
- Expand inpainting region at a cutoff timestep. This improves seam
coherence around inpainting regions.
- Add Trajectory Guidance to improve the ability to control how much an
image gets modified during image-to-image/inpainting (see the code for a
more technical explanation - it's well-documented).
## `trajectory_guidance_strength` Usage
- The `trajectory_guidance_strength` param has been added to the `FLUX
Denoise` invocation.
- `trajectory_guidance_strength` defaults to `0.0` and should be in the
range [0, 1].
- `trajectory_guidance_strength = 0.0` has no effect on the denoising
process.
- `trajectory_guidance_strength = 1.0` will guide strongly towards the
original image.
## FLUX image-to-image usage tips
- As always, prompt matters a lot.
- If you are trying to making minor perturbations to an image, use
vanilla image-to-image by setting the `denoising_start` param.
- If you are trying to make significant changes to an image, using
trajectory guidance will give more control than using vanilla
image-to-image. Set `denoising_start=0.0` and adjust
`trajectory_guidance_strength` to control the amount of change in the
image.
- The 'transition point' where the image changes the most as you adjust
`trajectory_guidance_strength` or `denoise_start` varies depending on
the noise. So, set a fixed noise seed, then tune those params.
## QA Instructions
- [x] Vanilla image-to-image - No change in output
- [x] Vanilla inpainting - No change in output
- [x] Vanilla outpainting - No change in output
- Trajectory Guidance image-to-image
- [x] TGS = 0.0 is identical to Vanilla case
- [x] TGS = 1.0 guides close to the original image
- Not as close as I'd like, but it's not broken.
- [x] Smooth transition as TGS varies
- [x] Smoke test: TGS with denoise_start > 0.0
- TG inpainting
- [x] TGS = 0.0 is identical to Vanilla case
- [x] TGS = 1.0 guides close to the original image
- Not as close as I'd like, but it's not broken
- [x] Smooth transition as TGS varies
- [x] Smoke test: TGS with denoise_start > 0.0
- TG outpainting
- [x] TGS = 0.0 is identical to Vanilla case
- [x] Smoke test TGS outpainting
- [x] Smoke test FLUX text-to-image
- [x] Preview images look ok for all of above.
## Known issues (will be addressed in follow-up PRs)
- The current TGS scale biases towards creating more change than desired
in the image. More tuning of the TG change schedule is required.
- TGS does not work very well for outpainting right now. This _might_ be
solvable, but more likely we'll just want to discourage it in the Linear
UI.
## Merge Plan
No special instructions.
## Checklist
- [x] _The PR has a short but descriptive title, suitable for a
changelog_
- [x] _Tests added / updated (if applicable)_
- [x] _Documentation added / updated (if applicable)_
## Summary
If a FLUX dev model is selected, show icon and popover telling user
about its license for commercial use
## Related Issues / Discussions
<!--WHEN APPLICABLE: List any related issues or discussions on github or
discord. If this PR closes an issue, please use the "Closes #1234"
format, so that the issue will be automatically closed when the PR
merges.-->
## QA Instructions
<!--WHEN APPLICABLE: Describe how you have tested the changes in this
PR. Provide enough detail that a reviewer can reproduce your tests.-->
## Merge Plan
<!--WHEN APPLICABLE: Large PRs, or PRs that touch sensitive things like
DB schemas, may need some care when merging. For example, a careful
rebase by the change author, timing to not interfere with a pending
release, or a message to contributors on discord after merging.-->
## Checklist
- [ ] _The PR has a short but descriptive title, suitable for a
changelog_
- [ ] _Tests added / updated (if applicable)_
- [ ] _Documentation added / updated (if applicable)_
