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21 Février 2021
ImageJ/FIJI – The Image Multi-Tool. ImageJ should be the first program you become familiar with when looking for image analysis software. Download it, search through the plugins to see what's available and test them out. Being proficient at using ImageJ is essential for most image processing and analysis.
GIMP is a famous free and open-source raster graphics editing software that is used for free-form drawing, retouching images and converting images into different image formats. The stable version 2.10.10 release date of the software is April 7, 2019. ImageJ is a Java-based image processing program developed as a collaboration between the National Institutes of Health and Laboratory for Optical and Computational Instrumentation at the University of Wisconsin.ImageJ is probably the best known and longest-lived open source software for biomedical image analysis.Even though the program is so widely used, ImageJ is an experimental system.
Advanced Processing – Surpassing the standard version, Agisoft Pro provides multispectral image processing as well as network processing capabilities. Weakness: Even though the Agisoft Photoscan Pro is a significant upgrade over its predecessor, it still suffers from the same weaknesses as the Agisoft Standard Edition: specialized user base. Image processing free download - Processing, Image Processing Toolbox for Matlab, Maze Solver with Image Processing, and many more programs.
This is the official website of the GNU Image Manipulation Program (GIMP).
GIMP is a cross-platform image editor available for GNU/Linux, OS X, Windows and more operating systems. It is free software, you can change its source code and distribute your changes.
Whether you are a graphic designer, photographer, illustrator, or scientist, GIMP provides you with sophisticated tools to get your job done. You can further enhance your productivity with GIMP thanks to many customization options and 3rd party plugins.
GIMP provides the tools needed for high quality image manipulation. From retouching to restoring to creative composites, the only limit is your imagination.
GIMP gives artists the power and flexibility to transform images into truly unique creations.
GIMP is used for producing icons, graphical design elements, and art for user interface components and mockups.
GIMP is a high quality framework for scripted image manipulation, with multi-language support such as C, C++, Perl, Python, Scheme, and more!
GIMP provides top-notch color management features to ensure high-fidelity color reproduction across digital and printed media. It is best used in workflows involving other free software such as Scribus, Inkscape, and SwatchBooker.
GIMP provides extensibility through integration with many programming languages including Scheme, Python, Perl, and more.
The result is a high level of customization as demonstrated by the large number of scripts and plug-ins created by the community.
Header image: Niagara Rainbow by Ville Pätsi (cba)
High Quality Photo Manipulation background image by Pat David (cba)
Original Artwork Creation background image by David Revoy (cb)
Graphic Design Elements background image by Ollin Bohan (cba)
Astrophotography is closer to science than art, and there is no such thing as 'getting it right in camera.' This means you cannot simply point the camera at the sky and snap away.
In astrophotography you cannot avoid post processing your images, so stacking and editing your images serves three main purposes:
Image stacking is the technique used to improve the signal to noise ratio, and it is the only noise reduction method that will boost the image details rather than smear them out.
In this article, we will discuss some of the most popular software available for astrophotography image stacking.
Note: Don't miss the detailed video at the end of this article, It was created to help show you how to quickly start using some of the stacking software mentioned in this article.
Click here to skip to our Image Stacking Demo Video.
The concept behind image stacking is simple, but to appreciate how it works, there are a couple of things we have to consider:
In the simplest form of image stacking, the pixels values for all images in the stack are averaged to produce a single image.
The result is a single image with improved signal to noise ratio, i.e., with better details and lower (random) digital noise and better details.
The scheme below illustrates the concept.
If the considered digital noise affects the pixel values randomly across the stack, then the result of averaging the stack is that the random component of the noise to the pixel value is significantly reduced.
ISO noise and Luminance noise and Chrominancenoise are examples of digital noises that are random.
The image below shows a real-life example from stacking 30 images from my Sony RX10 bridge camera taken at ISO 6400. As you can see, the original images showed a greater deal of noise (grain) than the stacked one.
The more images you stack, the cleaner the resulting images are, as shown in the comparison below.
While Image stacking creates a cleaner image, it often softens the image: digital sharpening techniques are then used to recover sharp looking details.
Finally, bear in mind that the progression of image quality is not linear.
If stacking 4 images improves the image quality of 50% respect what you got by stacking only 2 images, to improve a further 50% the image quality from stacking 50 images, you may need to stack 300 images or more.
If nothing moves between shots, like in the previous real life example, implementing image stacking is very simple: just group the images and average them to smooth out the noise.
With a moving subject, grouping and averaging the images will not only smooth out the noise, but also the subject itself.
This is the same principle for which long exposures of passing traffic and crowd result in a street image without cars nor people.
This effect is amplified with the number of images used, and the moving subject could simply disappear from the stacked image.
To resolve the issue, you have to align the images based on their content before stacking.
Due to image alignment, you may have to trim the edges of the stacked image to get rid of artifacts, but your target will not be lost.
Note that while in theory you can stack images of a static scene taken with the camera on a tripod, in reality, those images will probably differ at the pixel scale due to micro-movements. It is always beneficial to align the images before stacking.
Image stacking can be done with any camera and even camera phones and with images in both RAW and JPEG format.
Nonetheless, some things can be done to improve the final result:
Related:Astrophotography Software & Tools Resource List
As said previously, image stacking is a standard technique implemented in any astrophotography editing workflow for,
Every astronomy image will benefit from image stacking.
Here is a list of software used in astrophotography for image stacking.
Complete Image Editor | Commercial – Subscription Plan Photography Bundle $9.99 / Month | Mac OS X, Windows
If you are interested in photography, chances are you know Adobe Photoshop is the standard in the industry and does not need introductions.
With Adobe implementing a subscription plan for their applications, if you are using Lightroom CC for your everyday photography, your plan subscription will also include Photoshop CC and Bridge CC.
And for astrophotography, Photoshop is what you need. Lightroom cannot stack your images nor perform the histogram stretching, two crucial steps in the editing workflow for astrophotography.
In this article, we have already covered in detail how to stack astrophotography images with Photoshop.
Deep Sky And Starry Landscape Stacker | Freeware | Windows
Sequator is an easy-to-use and intuitive astrophotography software for stacking both starry landscape and deep-sky images. It can also be used to create star trails.
While not as advanced as other stackers, it nonetheless allows you to calibrate your light frames with dark and flat calibration frames. It also allows you to remove light pollution, reduce noise, and perform other simple tasks on the stacked image.
Starry Landscape Stacker | Commercial, $39.99 | Mac OS X
If you are into starry landscapes and you are a Mac user, Starry Landscape Stacker is a must-have.
Easy to use, it allows you to stack and align the sky and the foreground independently by letting you easily mask the sky.
Macbook facebook messenger. Unfortunately, the software lacks the support for RAW formats, thus forcing you to convert your RAW images in the more heavy TIFF format.
Aside from that, it works very fast and the final image is of good quality. You can also save the sky only, which is useful to further edit the shot in Photoshop or similar editors.
Deep Sky Stacker | Commercial, $24.99 | Mac OS X
Starry Sky Stacker is Starry Landscape Stacker brother and it has been created to stack deep sky astrophotography images.
As Starry Landscape Stacker, Starry Sky Stacker is very easy to use and intuitive, although very basic.
If you are a casual star shooter and a Mac user, this could be a good choice for you.
Deep Sky Stacker | Freeware | Windows
Deep Sky Stacker, better known as DSS, is arguably one of the most widely used software to calibrate and stack astrophotography images.
With DSS, you can fully calibrate your images with Darks, Flats, Dark Flats, and Bias calibration frames for the best results possible. Light frames are analyzed and scored by quality so that you can decide which percentage of best images you can stack (Best 75% by default).
A very interesting feature is that with DSS, you can easily combine images taken during different imaging sessions, to produce images of higher quality.
Planetary Stacker | Freeware | Windows
Autostakkert!, also known as AS!, is a very popular free software among the solar system astrophotographers. With AS! it is easy to stack both images showing the full Planetary (or Lunar or Solar) disc and images showing lunar surface close-ups.
The interface is a bit confusing, particularly in the beginning, but it is easy to navigate through the different steps for the stacking.
Unfortunately, AS! does not offer wavelet sharpening, which is a widely used technique in planetary and lunar astrophotography. For this, you can load your stacked image in Registax, another freeware software for Windows only that, sadly, is now 'abandoned-ware.'
Planetary Stacker | Freeware | Mac OS X
Lynkeos is perhaps the only freeware planetary stacker software for Mac OS X, sparing you from turning to Windows for using Autostakkert!.
The interface is quite intuitive to navigate, but not when it comes to performing the different tasks.
On the other hand, it offers a deconvolution method and wavelet sharpening, a must-have for a planetary stacker. Definitely worth having a look at it if you are a Mac user.
Deep Sky Astrophotography Editor | Freeware | Mac OS X, Windows, Linux
SiriL is a freeware, cross-platform, astrophotography package that will let you calibrate, stack, and develop deep sky astrophotography images.
While not as easy and intuitive as Sequator or DSS, it offers a lot of options and produces good results. There is an active community, and it is under constant development.
Deep Sky Astrophotography Editor | Commercial $60/Yr Renter License Or $150 Owner License | Mac OS X, Windows, Linux
With Astro Pixel Processor (APP), you step in the realm of full-grown astrophotography packages, with many advanced options and methods to calibrate, stack, and post-process your deep-sky images.
Compared to PixInsight (PI), the software benchmark for the category, APP is cheaper and way easier to use, which makes it one of the best PI alternatives.
If you decide to buy it, you can choose between the renter's license for $60/yr, to always get the latest version of APP, or the owner's license for $150, but you will have to purchase the license again for major update releases.
Astrophotography Editor | Commercial – €230+VAT | Mac OS X, Windows, Linux
When it comes to astrophotography, PixInsight is the software of reference against which all others are measured. It offers everything you may possibly need to produce pro graded images, and it is objectively the best software in the field.
But user experience can be frustrating, as the learning curve is very steep, the editing is long and convoluted, and your computer must be quite recent and powerful to make it run smoothly.
The €230 + VAT price tag is also quite steep: sure it is worth every penny, but this makes PI be even more the software of choice for professional and keen amateur astrophotographers.
In this video, I show you how easy it is to wet our feet with image stacking.
This is particularly true if you use Starry Landscape Stacker, Sequator, Deep Sky Stacker and Autostakkert!, as I showed in the video below.
Image stacking is one of the crucial steps in the astrophotography editing workflow.
You'll need the appropriate stacker for each type of astrophotography: starry landscapes, star trails, or deep-sky and planetary images.
In this article, we have covered the most popular astrophotography stackers available on the market, both freeware and commercial.
And while Windows users have the more extensive choice, some notable stackers are available for Mac and even Linux users.
These are software which are used to enhance images – be it nano images or even those of astrophotography. They allow real-time editing, comprehensive RAW editing and some work with images which contain over thousands of layers. They work in any color space, work with CMYK, RGB, LAB, Greyscale and more as well as they work with 16 bit per channel editing. They support haze removal filters, contrast negative blend mode as well as some provide unsurpassed file compatibility with almost all types of image files.
This software is an open source program used for image processing. This can be used for a variety of work like rescaling, cropping, gamma correction, color balancing as well as chroma keying. This uses script files and it uses technical image processing which requires both repeatabilities as well as precision.
This software especially is designed for astronomical images from the ground up. It offers better results due to advanced data mining algorithms as well as noise tracking. This is a great tool for those who are into astrophotography and it has state of the art functionality which makes it superior to most astrophotography software.
This software is used for image processing at a small level. It has a basic module as well as 14 add-ons which are optional and are designed for special purposes. This is used for academic research and for specialized purposes including semiconductor inspection, nanotechnology, physics, chemistry etc. It supports 104 file formats and topographical images can be stitched accurately.
This supports different image as well as photo formats including Comprehensive RAW editing. It supports drag and drop as well as printing. It can show the GPS location and is portable to use. It does not need to be set up or installed in order to run. It works on Windows OS.
It is used for Mac OS 10.10 and higher. It does not require any subscription nor any hassles in using this software. You can create logos and artwork with it. It has a shape processor and you can move and tweak shapes. It allows snapping to lines, grids, canvas, shapes and more. There are masks and it allows for Haze Removal filter and so much more.
Android mobile data transfer to pc software. This is designed specifically for Android devices and more than 150 image formats can be loaded, saved and converted. It allows for barcode reading, image processing functions as well as annotation and markup. It has native shared object binaries as well as Java wrapper libraries for application development on Android media.
This works with Mac OS and it allows for meticulous workflows, it has tools for enhancing, retouching and editing of images. It has an intuitive interface and has Comprehensive RAW editing. This software has Unsurpassed file compatibility. The user can Work in any color space and it is has panning and zooming with live previews.
They are compatible with different types of files and develop RAW files into built-in workspaces. You can apply effects to these images and it allows for markup as well as a comprehensive annotation. Some support features of OCR so that images can be converted to searchable text.
These software can be used to create layered screenshots and custom selections can be done too. It can be used for batch image editing and some support custom plugins, being written by the user as well as designer brushes being created as well. Multi-stop live gradients are possible as well as vector chops.
These software also support text tools and some even have spell checks built in. Traditional techniques of photography like dodging, burning, blurring, smudging are also supported.
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