Gradientxterminator Photoshop Plug-in: Fast and Easy Gradient Removal for Astrophotography
maviradownGradientXTerminator: A Powerful Photoshop Plug-in for Removing Gradients
If you are into astrophotography, you know how frustrating it can be to deal with gradients in your images. Gradients are variations in brightness or color across the image that are not caused by the actual objects you are photographing, but by external factors such as light pollution, atmospheric conditions, or image calibration errors. Gradients can ruin the appearance of your images, making them look washed out, uneven, or distorted. They can also make it harder to process your images and bring out the details of the deep-sky objects.
Gradientxterminator Photoshop Plug-inl
Fortunately, there is a solution for this problem: GradientXTerminator. GradientXTerminator is a gradient removal plug-in for Photoshop that is fast and easy to use. It can process 32-bit, 16-bit, or 8-bit images, grayscale or RGB color. It easily tackles large-scale gradients from light pollution, but can also handle vignetting and even tricky edge, corner, and circular gradients that are very hard to deal with otherwise. And assuming you already use Photoshop in your work flow, you may now have one less program to transfer your image into.
In this article, we will explain what gradients are and why they are a problem for astrophotography, how GradientXTerminator works and what options it offers, what are the benefits of using GradientXTerminator, and how to get it.
What are gradients and why are they a problem for astrophotography?
Causes of gradients
Gradients are caused by various factors that affect the brightness or color of the pixels in your image. Some of the most common causes are:
Light pollution: This is the artificial light from cities, street lamps, cars, etc. that illuminates the sky and reduces the contrast between the stars and the background. Light pollution can create a gradient that is brighter near the horizon and darker near the zenith.Atmospheric conditions: This includes airglow, aurora, moonlight, clouds, dust, humidity, etc. that can scatter or reflect light in different ways and create variations in brightness or color across the sky.Image calibration errors: This includes errors in flat-fielding, dark subtraction, bias subtraction, etc. that can introduce gradients due to uneven illumination or sensitivity of the camera sensor or optical system.Effects of gradients
Gradients can have several negative effects on your astrophotography images:
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Reduced contrast: Gradients can make your images look dull and flat, as they reduce the difference between the bright and dark areas of the image.Reduced dynamic range: Gradients can make your images look clipped or saturated, as they push some pixels beyond the maximum or minimum values that can be displayed or processed.Reduced color accuracy: Gradients can make your images look unnatural or distorted, as they alter the hue or saturation of some pixels.Reduced detail: Gradients can make your images look noisy or blurry, as they obscure or mask some of the fine details of the deep-sky objects.How does GradientXTerminator work?
Background selection
The first step in using GradientXTerminator is to select the background areas of your image. These are the areas that contain only sky pixels and no objects such as stars, galaxies, nebulas, etc. The plug-in will use these areas to estimate the background gradients and remove them from the rest of the image.
You can use any of the selection tools in Photoshop to select the background areas. Some of the most effective tools are:
Lasso tool: You can use this tool to select all of the foreground (object) areas first, and then invert the selection to get only the background areas.Magic wand tool: You can use this tool to select background regions by clicking on them with a low tolerance value (between 5 and 10). You can also use the Shift and Alt keys to add or subtract areas from your selection.```html the steps to install GradientXTerminator on your computer. You will need to select the folder where Photoshop or Affinity Photo is installed and enter your license key when prompted.After installing GradientXTerminator, you can launch Photoshop or Affinity Photo and find GradientXTerminator under the Filter menu. You can then use it to remove gradients from your images.
Free trial and support
If you are not sure if GradientXTerminator is right for you, you can try it for free for 30 days. To get the free trial, you need to visit https://www.rc-astro.com/resources/GradientXTerminator/download.php and select your operating system. You will then receive an email with a download link and a temporary license key for GradientXTerminator. You can use this key to activate your copy of GradientXTerminator after installing it.
The free trial version of GradientXTerminator has the same features and functionality as the full version, except that it will display a reminder message every time you use it. You can use the free trial version for 30 days from the date of installation. After that, you will need to purchase a permanent license key to continue using GradientXTerminator.
If you have any questions or issues with GradientXTerminator, you can contact the developer at support@rc-astro.com. You can also visit https://www.rc-astro.com/resources/GradientXTerminator/ for more information, tutorials, and manual.