![]() Regardless of the values you input in the Fade In amount and Fade Out amount, the condition fade_in_amount + fade_out_amount 100. ![]() PS: When using the option Fade In and Out you need to keep in mind that: Then the first 40% of the trail will have maximum opacity value of 100, the remaining 60% will be faded out. This represent the extent of the Fade Out option. Fade Out amount : default value to 100%.Then the first 60% of the trail will be faded in, the last 40% will have maximum opacity value of 100. This represent the extent of the Fade In option. Fade In amount : default value to 100%.In and Out: the opacity of each frame will change from 0% to 100% and back to 0%.Out: the opacity of each frame will change from 100% to 0%.In: the opacity of each frame will change from 0% to 100%.Every frame will be set with the same opacity value of 100%. Each frame will get an opacity value computed accordingly to the option of your choice: Fade Trails: this is the option to use when you wish to create a fade effect on the trails (also known as comet-like effect).This will approximately double the time to process each frame. See this article for detail on how this works: Creating star trails with automatic sky glow removal. The theory being the blur removes the detail leaving only the sky glow which can then be removed. This is then subtracted from the light frame before stacking. Automatically remove skyglow: Attempts to reduce the effect of sky glow by creating a copy of each light frame and applying a heavy blur.This will add a lot more time to the stack and use more memory but gives more options in post processing. Disabling this will leave each image in it's own layer. Merge all images into a single layer: This will merge each layer into 1 final image as the stacking progresses.Because of the speed issue, this is disabled by default. This slows the process down considerably, around 3-4 times slower. Live display update (MUCH slower): This will display the frames to the screen live as they are stacked together.They will be named trail00001.jpg, trail00002.jpg and so on. Intermediate save directory: The directory to save the intermediate frames to.Save intermediate frames: Checking this will save an image after each frame is layered, allowing you to make a time lapse of the trail building up.Dark Frames: the folder containing all your dark frames, i.e.Use Dark Frames: Do you want to use dark frame noise reduction.Light Frames: the folder containing all your light frames, i.e.Once loaded you will be given the following options to set: Once installed the menu option can be found under File ➡️ Create ➡️ Startrail On linux and macs this can be done by running chmod +x startrail.py from the plugins folder. If the plugin isn't working for you then check this first. The startrail.py script requires execute permissions for it to work. Once done reload GIMP to have the changes take effect. You will also be able to see the default locations used on this dialog. Here you can add a new folder by clicking the new button ( □) and then navigating to the folder. This last option can be done by going to Preferences ➡️ Folders ➡️ Plug-Ins. You can either place it in the default locations (see below), or my preference, by adding a plugin folder in my home directory to the plugins. To install the plugin, copy the file startrail.py into a plugin folder of your choice. On Linux and OSX this will be preinstalled but for Windows you will need to install this separately. Gimp-startrail-compositor is a plugin for GIMP which automates the stacking of startrail images, producing either 1 or a set of stacked images.
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