Sky replacement issue
I have an image of a clock tower against a pale blue sky. The sky replacement works great to introduce a new sky but leaves a pale outline around the tower. I've significantly darkened the sky to show the issue.
Is this a known issue, or is there a work around? I've attached the (semi)original image - in PhotoShop I removed the existing sky, figuring that might be part of the issue, and replaced it with a sample colour from the original sky.
Any thoughts or ideas appreciated. Thanks in advance.
BTW... I've used this feature on other images and it's absolutely incredible!
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The very tall column into the open sky is unusual, and perhaps a situation the engineers did not envision when writing the code. Did you experiment with rotating the image 90-degrees and then applying the sky replacement in Luminar 4? Would be interesting to know if this made any difference.
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I have the same scenario when replacing a light sky with a dark sky in a typical cityscape - there is a halo around the foreground subject. It seems to be too much feathering of the replacement sky. I tried several of the sliders and was not able to make it acceptable to me. Other replacements are great, but it seems to struggle with the dark replacement cloudy skies.
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That results in the sky being in the wrong orientation, although I will admit that it did a better job of recognising the building. Since I posted I've noticed it doesn't work well with portraits either. I think you're right... it's not something they anticipated, so any image with strong vertical elements isn't a good candidate for the sky replacement tool. Even pictures of skyscrapers, which they showed in the teaser videos, have a faint pale glow on the sky side.
Either I'm missing something in the settings (and I've adjusted EVERYTHING!) or this tool is best restricted to landscapes. Really cool what it can do, but not the answer for everything.
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And a workaround that works if your sky, like mine, is consistent. Also works with any sky if you're willing to put in the effort. You need to use Photoshop for this.
- Select the sky, invert the selection... Select/Inverse, and save the selection.. Select/Save Selection. Rename it "Sky Mask". Press CTRL-D to remove your active selection
- Enter Luminar 4 and pick your sky. Under Advance choose Sky Exposure and brighten the sky to the point that you can't see the haloing. Click apply to return to Photoshop
- In Photoshop create a curves adjustment layer. Adjust until your sky looks the way you want - don't worry about the rest of your image, just the sky. Load your selection from step one... Select/Load Selection. In the dialog box, choose Channel and click on Sky Mask then OK
- Select the mask for the adjustment layer (left click on it)
- Press D to set default Background/Foreground colours then press CTRL-Backspace to fill in the curves adjustment layer. Looking at the mask, the sky will be white, everything else black. Press CTRL-D to remove the active mask.
Hope this helps. If you need any clarification please let me know. :)
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Hi Jeremy,
Did you work with the Sky Global and Sky Local sliders? If not, they could prove quite useful in this situation.
If they didn't help, then please reach out to www.skylum.com/support so our developers can take a closer look. Thanks in advance!
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More experimentation with this issue: An HDR image produced from a single raw with one of the skies accompanying L4 produced a halo along some vertical edges. The same raw rendered as a normal image with the same sky replacement looked great. So, it appears extreme contrast differences between the base image and the sky image may be a factor in this problem.
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