Smartphone technology has significantly improved the quality of photos that we take. Previously, good photos were only limited to photographers who invested in expensive equipment. Post processing was done in computers using paid software like Photoshop or CorelDraw. Times are different now, however. You can take an excellent picture within a matter of few seconds using your Android smartphone. Keeping this in mind, it's also important to invest in a photo editing software for your Android device rather than relying on the stock photo editing options offered by the manufacturer.
GIMP is a free and open-source photo-editing tool that has been around for more than 20 years. It boasts a limitless number of state-of-the-art features that you wouldn't expect to see in a free photo-editing app. The interface has been recently updated to be easier to use, however it still can be quite confusing for novices. GIMP is a free and open-source photo-editing tool that has been around for more than 20 years. It boasts a limitless number of state-of-the-art features that you wouldn't expect to see in a free. In the past, this phrase to many of us suggested, poor quality, clunky and inefficient. Time have changed however and in the photographic world there is a veritable abundance of excellent, powerful software for the princely sum of zero. Not only are there editing programs, but also fully featured image management software. Today we are going to take a look at five of the best.
When we talk about photo editing apps for Android, there are quite a few of them that come to mind. Keeping this in mind, we're going to carefully pick out some of the best photo editing apps available for the platform. Moreover, these are all free offerings, so you won't have to spend a dime to get started.
Let's have a look.
5 Best Free Photo Editing App for Android in 2020
Snapseed
Google's own photo editing app, Snapseed is an extremely versatile offering that lets you do a whole lot more than just adding filters to your photos. It can improve balance and tone of your photos, let you make selective modifications to your images, and do a whole lot more with little to no effort. You can customize each aspect of the editing, and save them for later perusal. There are easy to access presets here as well, which will allow you to make quick changes with just a few taps.
It can open JPEG and RAW (.dng) files by default, allowing you to create masterpieces from plain images. There are a total of 29 tools and filters that you can access on Snapseed, giving you quick access to some rapid modifications. Features like Face Enhance and Face Pose ensure portraits are properly aligned by using three dimensional models. This app comes from Google directly, and is devoid of ads and in-app purchases. It works with smartphones running Android 4.4 and higher.
PicsArt Photo Studio
PicsArt is an extremely popular third-party photo editing software that has been around for quite some time. It comes with a fairly decent set of features, allowing you to make changes to your photos with just a couple of taps on the screen. It allows you to draw on your photographs to give it that custom touch. PicsArt also allows image remixing which works by blending your own image with a library of images provided by PicsArt, letting you convert a simple image into a work of art.
Since this is a consumer driven photo editing app, you will find all the cool features like collages, stickers, filters and so on. You can also make your own stickers and clipart using the sticker maker feature on PicsArt. Moreover, you can use 100s of fonts available on the app to write over your images in a style that you please. Overall, PicsArt is one of the most popular photo editing apps out there, and we recommend you to give it a shot. Although the app is free to download, it comes with ads and in-app purchases. PicsArt Gold gives you access to thousands of custom stickers that are valued at well over $3000 as per the developer. This is worth a try if you're a pro photo editor.
PhotoDirector Photo Editor
This is a comprehensive photo editing app that lets you do more with your photos as you shoot them. Using live camera filters and effects, the app lets you get a lot more out of your photos compared to standard editing. Naturally, there are standard editing features present here as well, which allow you to make the best out of your photos. You can choose to add photo effects to the entire picture or just selectively to some parts of the photo.
This app also lets you make innovative collages using multiple photos at once. This is a common feature among photo editing apps, so we're not particularly surprised by its addition. Although the app is free to download, paid users get several additional benefits. However, the free app is still pretty functional and packs a ton of features. PhotoDirector comes with ads and in-app purchases. The app works with devices running Android 4.1 and higher.
Adobe Photoshop Express
Adobe has been one of the most popular developers of photo editing software for PCs and mobile devices alike. Keeping this in mind, the addition of Photoshop Express on this list shouldn't be surprising to many. It has a simplistic user interface and access to all the top features that you need from a photo editing app. You can add filters, adjust appearance of subjects, remove blemishes from photos and do a whole lot more using this app. You can get some additional features on the app when you sign-in with an Adobe ID. It also has a pretty neat collage maker that can help you transform a group of photos into a proper photograph, recapturing all the memories in one frame.
Photoshop Express by Adobe is a free download on the Google Play Store and comes with ads and in-app purchases. It works with devices running Android 4.4+.
AirBrush
As the name suggests, this app helps you selectively make adjustments to your photos without affecting the entirety of it. Naturally, you can also transform entire images if you feel up for it. There are a ton of filter options here as well as single tap transformation features that help you change the look and feel of a picture entirely. The app also has a 'brighten' function that immediately enhances the entire image.
You can use tools like blur to selectively add bokeh effects to your photos. You can also use real time editing features to make the necessary edits before you even take a selfie, thanks to the in-app camera. The app has all the necessary social media sharing options by default. AirBrush is a free download on the Play Store and is supported by ads and in-app purchases.
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: Macbook 2008 operating system.
- Reduce noise and deal with light gradients and vignetting.
- Improve signal to noise ratio.
- Reveal the faint details in the image.
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.
What Does Stacking Photos Mean?
The concept behind image stacking is simple, but to appreciate how it works, there are a couple of things we have to consider:
- A stack can be visualized as a pile of images all stacked one on top of the other;
- Each digital image is formed by a set of pixels, all having a certain value: dark pixels will have a lower value than the bright ones;
In the simplest form of image stacking, the pixels values for all images in the stack are averaged to produce a single image.
What is the purpose of stacking photos?
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 Better
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.
Image Stacking And Movement
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.
How To Shoot For Exposure Stacking Your Images
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:
- Lock the focus, so that the camera will not hunt for it between images. This will also help to keep the focus consistent through the shooting sequence.
- Keep the same settings, in particular shutter speed, aperture, and focal length: you don't want to change the camera field of view during the sequence, nor the brightness of the images or the depth of field.
- If you are shooting on a tripod, disable image stabilization. If you want to shoot handheld, do so only for short sequences at very high shutter speed.
Image Stacking In Astrophotography
Related:Astrophotography Software & Tools Resource List
As said previously, image stacking is a standard technique implemented in any astrophotography editing workflow for,
- A star field from a fixed tripod.
- A deep sky object from a tracking mount.
- The Moon handheld.
- A starry landscape from a fixed tripod or tracking mount.
Every astronomy image will benefit from image stacking.
List Of Photo Stacking Software For Astrophotography
Here is a list of software used in astrophotography for image stacking.
Adobe Photoshop
Complete Image Editor | Commercial – Subscription Plan Photography Bundle $9.99 / Month | Mac OS X, Windows
Pro
- Versatile
- Available for Mac and Windows
- In bundle with Adobe Lightroom CC, Bridge, Camera Raw, and web space
- Many action packs and plugins available for astrophotography
Cons
- Subscription Plan only
- Can't be used to calibrate light frames
- Stacking capabilities are somehow limited
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.
Sequator
Deep Sky And Starry Landscape Stacker | Freeware | Windows
Pro
- Free
- Easy to use
- Fast
- Suitable for both Starry Landscapes and Deep Sky images
- Can create Star Trails
Cons
- Windows only
- Limited set of options
- Not suitable for Planetary astrophotography
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
Starry Landscape Stacker | Commercial, $39.99 | Mac OS X
Pro
- Fast
- Easy to use
Cons
- Mac Os X only
- Does not read RAW files
If you are into starry landscapes and you are a Mac user, Starry Landscape Stacker is a must-have.
Starry Landscape Stacker
Starry Landscape Stacker | Commercial, $39.99 | Mac OS X
Pro
- Fast
- Easy to use
Cons
- Mac Os X only
- Does not read RAW files
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.
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.
Starry Sky Stacker
Deep Sky Stacker | Commercial, $24.99 | Mac OS X
Pro
- Fast
- Easy to use
Cons
- Mac Os X only
- Does not read RAW files
- Basic
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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
Deep Sky Stacker | Freeware | Windows
Pro
- Free
- Easy to use
- Fast
- Full light frames calibration
- Features Comet stack modes
- Can Drizzle
- Many advanced stack options and methods available
Cons
- Windows only
- Post-processing is quite limited
- Not suitable for Starry Landscapes nor for Planetary astrophotography
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.
Autostakkert!
Planetary Stacker | Freeware | Windows
Pro
- Free
- Easy to use
- Suitable for Planetary, Lunar and Solar images
- Stack full planetary disk and lunar surface close-ups
Cons
- Interface a bit confused
- It does not offer wavelet sharpening
- Windows only
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.'
Lynkeos
Planetary Stacker | Freeware | Mac OS X
Pro
- Free
- Has deconvolution and wavelet sharpening
- It is probably the only freeware planetary stacker for Mac OS X
Cons
- Not very intuitive
- Somewhat slower than Autostakkert!
Lynkeos is perhaps the only freeware planetary stacker software for Mac OS X, sparing you from turning to Windows for using Autostakkert!.
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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.
SiriL
Deep Sky Astrophotography Editor | Freeware | Mac OS X, Windows, Linux
Pro
- Free
- Cross-Platform
- Active development
Cons
- A bit convoluted and not as intuitive as other stackers
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.
Astro Pixel Processor
Deep Sky Astrophotography Editor | Commercial $60/Yr Renter License Or $150 Owner License | Mac OS X, Windows, Linux
Pro
- Full-grown astrophotography package
- Fairly easy to use
- Mosaics are created with ease and are of great quality
- Active and constant development
- Cross-Platform
- 30-days Trial period
- Affordable yearly subscription
Cons
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- Only for deep sky astrophotography
- No Comet stacking mode
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.
PixInsight
Astrophotography Editor | Commercial – €230+VAT | Mac OS X, Windows, Linux
Pro
- It has all you need for astrophotography
- 45 days trial period
- A lot of tutorials and information available
Cons
- Expensive and without subscription plan
- Extremely steep learning curve
- Long and convoluted process
- Needs a powerful computer
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.
A Comprehensive Demo About Image Stacking
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.
Conclusion
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.
