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Star stacking — TIFF files without alpha channel

I was using ON1 to prepare nightscape / milky way RAW images for stacking by Starry Landscape Stacker (Mac OS). I exported the images as TIFF files which were rejected by Starry Landscape Stacker (SLS) as mask files.

Reviewing the SLS website, I discovered a posting indicating an issue with ON1 TIFF files and suggesting one remove the alpha channel when saving TIFF files. I understand from ON1 support, that this is not possible until a development change is made.

My workaround has been to import ON1 TIFF files into Luminar 2018 and get Luminar 2018 to save the images as TIFF files that can be imported into SLS.

Douglas Margison

One comment on “Star stacking — TIFF files without alpha channel”

  1. On March 21, 2019 at 12:28 pm John Sculati wrote:

    The following method should also work for flattening a TIFF file produced by ON1 Photo RAW:

    1. Move all the images requiring alpha channel removal in a folder by themselves.
    2. Select all the images and double-click on one of them.
    3. After Preview opens, all the images will show on the left sidebar. Use Command-A to select them all.
    4. Select File -> Export Selected Images from the menu bar.
    5. Click the Options button in the Export window and deselect the “Alpha” checkbox.
    6. Next click on the “New Folder” box. A pop-up will suggest the name of a new folder. Click on the “Create” box.
    7. Finally, click on the “Choose” box and your images will be created in this new folder.
    8. Replace the old images with the new ones and delete the folder you just created.

    Used with macOS Mojave (10.14.3)

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