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FREE FOCUS STACKING SOFTWARE FOR MAC

16-11-2021 by admin

Focus stacking, image processing, 3D, and more. Coscinodiscus excavatus, a
diatom from Barbados → Click for larger view Tips & News Neues Video-Tutorial
Hintergrund putzen (Deutsch). New Tutorial 'How to learn the cross-eyed stereo
view' as video (engl.), or as pdf in English, German or French. The Focus
Stacking software for professional applications! Create textbook macros,
razor-sharp and with details like you’ve never seen before. With the new
technologies of FOCUS projects 4 professional you can create state-of-the-art
macro photos which have a fascinating depth of focus and bring extraordinary
details to light.

Focus stacking is very important in photography. There are times when one shot
of the subject isn’t enough, or maybe the shots look good, but they’re a bit out
of focus. To correct that, there are focus stacking software available and some
HDR Camera Apps as well.


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Focus stacking software and apps are very useful. It lets us bring out a new
kind of image from the picture we just took. We could make it brighter, darker,
shinier, and a bunch of other things we could do. When we are using them, our
imaginations are truly the limit.

They have the same value as Mobile Camera Apps, which lets us edit our faces
into funny-looking images. Lets us enhance our facial features, lighten our
skin, etc. Today, we’re not just taking pictures anymore. We are now enhancing
them to the fullest and making them the best.


RELATED POSTS


DEEP SKY STACKER TUTORIAL

I have been using DeepSkyStacker to get the most out of my astrophotography
images since I began shooting through a telescope in 2011. This useful and
easy-to-use freeware tool simplifies the pre-processing steps of creating a
beautiful deep sky image.

The concept of stacking in astrophotography is simple, by combining multiple
images together, the signal-to-noise ratio can improve.

With so much time and effort going into the acquisition stages of
astrophotography, it would be a shame not to achieve the best possible results
when stacking your images. In this post, I will explain the DeepSkyStacker
settings I use to stack and register all of my astrophotography images.

If you haven’t already done so, download DeepSkyStacker for free. The version I
currently use to stack and register my astrophotography images is DeepSkyStacker
4.2.3.

I have used DeepSkyStacker to align, calibrate and integrate every deep-sky
astrophotography image I have ever taken. It is well worth your time to learn
how to use this free software successfully, as you will enjoy it for years to
come.

Over the past 8 years, I’ve stacked images created using a DSLR camera,
dedicated astronomy camera, and CCD Camera. Whether you are stacking .RAW image
files from my Canon DSLR, or .FIT files from a CCD camera (or dedicated CMOS),
the right settings can be the difference between a good image, and a great one.

Integration is the key to great astrophotography image. This is the reason why
amateur astrophotographers spend multiple nights collecting pictures on a single
deep sky target. Calibration is another vitally important component of the
process, as this removes unwanted elements from your image that would otherwise
spoil the picture.

For an in-depth, step-by-step guide to DeepSkyStacker and Adobe Photoshop,
please consider downloading my premium image processing guide.

Page 35 of my premium image processing guide.


MAIN FEATURES

For many amateur astrophotographers, DeepSkyStacker (DSS) is an integral part of
their image processing workflow. For myself, I find that DeepSkyStacker does an
exceptional job of registering astrophotography images taken using a variety of
methods. This includes everything from untracked DSLR and camera lens shots to
deep sky astrophotography through a telescope.

DSS can register images of everything from a wide-angle Milky Way panorama to a
deep sky emission nebula. Most of my experience with this software has been on a
Windows 10 PC, stacking Canon RAW files from a DSLR. To run Deep Sky Stacker on
a Mac computer, a workaround such as using a virtual machine is necessary.

Let’s take a look at the main features of this software:

 * Registration of picture sets
 * Creation and use of offsets, flats, and dark frames
 * Native use of RAW files from most DSLR
 * Multiple Stacking methods including average, median, kappa-sigma clipping and
   more
 * Preview of all pictures including RAW and FIT file types
 * Simple and intuitive user interface

The DeepSkyStacker User Interface. Page 44 of my premium astrophotography image
processing guide.

DSS offers some advanced features I have not yet put into practice myself, such
as comet stacking. The steps outlined on this page are most useful for beginners
using a DSLR camera to capture their images. The official website offers some
great resources for understanding how the process works.

If you want to review the statistics of your images and stack them as they are
captured, you can try using DeepSkyStacker Live.

It’s important to remember that DeepSkyStacker was meant to integrate and
calibrate your data into a useful intermediate file. It does not include the
robust image processing tools of an application like Adobe Photoshop.

All of the images that run through the pre-processing stages in DSS are then
brought into Adobe Photoshop for final image processing. The image below shows a
stacked image before and after processing in Photoshop.

See the difference post-processing makes?

When you have successfully created your intermediate file in DeepSkyStacker, you
can process it much further. Read my Photoshop image processing tutorial for a
basic walkthrough of the process. Or, download my premium processing guide for
an in-depth look at all of the techniques I use to process astrophotography
images.


TUTORIAL (DEEP SKY IMAGES)

There are several applications available to register, calibrate, and stack
astrophotography images including Astro Pixel Processor, and PixInsight.
However, DeepSkyStacker is completely free and continues to receive new updates
from the developer (version 4.2.2 was published in August 2019).

The software may seem confusing at first, but the good news, generally the
default settings work best.

I regularly capture images on the same deep-sky object over multiple nights to
increase the signal-to-noise ratio. I shoot through heavy light pollution in my
backyard, which means I need to capture up to 4x or more the amount of exposure
time someone living under dark skies would (see this article for a better
understanding of this calculation).

I have experimented with many different combinations of options for stacking
DSLR raw files, and have found that most of the default settings work best. DSS
includes a handy “recommended settings” tab, that will highlight helpful
settings to use based on your image data.


FILE PREPARATION BEFORE STACKING

If you follow my astrophotography tutorials, you will have captured light
frames, dark frames, flat frames and offset/bias frames during each of your
imaging sessions. These support files (calibration frames) will go a long way
towards improving your final image. I recommend capturing new calibration files
for each night of imaging unless you are certain that your master files match
your light frames.

Only stack your best images

Before opening the files in Deep Sky Stacker, I pre-qualify the images I want to
stack. I use a RAW image preview application called Adobe Bridge to review and
organize my images. Any photos with football-shaped stars from hiccups in
autoguiding are tossed in the recycling bin. The same goes for frames with
airplanes, satellites or passing clouds.

You can also use the scoring feature built into DeepSkyStacker for a calculated
interpretation of your image data.


USING THE SCORE FEATURE

After registering your pictures in DeepSkyStacker, it will provide a score for
each of your light frames. The values of the score will vary widely depending on
the imaging equipment used. There is no benchmark number to achieve.

This is handy when stacking your final picture, as you may want to only include
the light frames with the highest score in your final stack. Instead of clicking
Check all as you did when registering the files, click Check above a threshold.

If you have prescreened your images already, you will likely stack most of the
images you registered anyway!

Remember, the scores will only appear after you register the picture files. Once
you have selected a minimum score value, DeepSkyStacker will only stack your
best light frames into the final image. I recommend choosing a minimum score
value that will use at least 70-80% of your light frames, as you want to use as
much integration time as possible for the best signal-to-noise ratio.


STACKING FIT FILES (CCD OR DEDICATED CMOS)

If you are transitioning from a DSLR camera to a dedicated astronomy camera, one
of the first hurdles to overcome is the new file type the camera produces. It’s
called “FITS”. Stacking FIT files in DeepSkyStacker presented a bigger learning
curve than I anticipated.

I’ve had most of my success using trial and error. For example, I was able to
produce an image with the correct color balance using a dedicated astronomy
camera with an RGGB Bayer pattern. I discovered this during my Markarian’s Chain
imaging session, by using a specific color adjustment setting.

You can adjust the RAW/FITS Digital Development Process Settings to make sure
that you have the correct Bayer Pattern Filter for your specific camera
selected. For most color dedicated astronomy cameras (including the ZWO ASI294MC
Pro camera I use), the correct setting is Generic RGGB.

These files can be hard to preview, due to the fact that they need to be
debayered first. For this file type, I inspect and remove poor quality frames
within DeepSkyStacker itself. This method can be a bit tedious, but a necessary
step to ensure your final image only includes the best data.


KEEP YOUR IMAGE SETS ORGANIZED

Organize your images into 4 folders. Lights, Darks, Flats and Offset/Bias.


IN THE MAIN GROUP:

Open Picture Files

Select all of your light frames from your first night of imaging. Since you have
already reviewed and approved all of the images in this folder, this is simply a
matter of selecting every RAW file in your light frame folder.

Dark Files

Select the dark frames you captured from the same imaging session. The images
need to be the same exposure length, ISO and temperature as your light frames.
These can be easily captured with the lens cap on your camera. I recommend using
a minimum of 15 dark files or more.

I believe that dark calibration frames are a must for DSLR astrophotography. In
my experience, they reduce a significant amount of noise in the final image
through dark frame subtraction.

Flat frames

Flat frames require a little more effort than dark frames but can be collected
in a very short amount of time. Stretch a white t-shirt over the objective of
your telescope, and smooth out all of the folds.

Point your telescope towards the blue dawn sky (or an evenly-lit artificial
light source), and capture a number of shots with your DSLR set to AV mode. 15
flat files can make a significant improvement to your final image. They remove
artifacts such as dust and correct vignetting and gradients in your image.

Offset/bias

Offset/bias files are quick and simple to capture with your DSLR camera. Just
take about 15 exposures with the lens cap on your DLSR. These exposures need to
be the fastest possible shutter speed using the same ISO as your light frames.
(On the Canon 450D, that’s a 1/4000 second exposure)


HOW TO COMBINE IMAGES FROM MULTIPLE NIGHTS


USE THE TABS TO GROUP YOUR IMAGE SETS

Once you’ve got your picture files (lights) and all of your support files loaded
into the main group, it’s time to load up your files from night 2. Click on the
small Group 1 tab at the bottom left of the screen, and repeat the process for
opening files from imaging night 2.

Remember, you can stack different variations of exposures together in Deep Sky
Stacker. This means a range of ISO sensitivity and exposure length.

Some imaging sessions may include all 3 supports files to complement the light
frames, some may not. This is fine. After all of the image files have been
loaded into their respective categories, it is time to register and stack the
frames into a single file. Finally, make sure to click “‘check all“, to make
sure that all of the frames you have loaded are selected.

Before we click Register and Stack images, let’s take a look at the current
default settings.

Accessing the Register and Stacking settings is accessible by clicking
“Settings…” under the options tab.

The default settings for registering is set to a 10% star detection threshold.
In my experience, the default value of 10% has worked very well for stacking
images captured using my 12MP Canon EOS Rebel DSLR. If you decrease the star
detection threshold, DSS will detect fainter stars. The number of stars in a
given light frame is displayed in the lower half of the screen.

With a light frame selected, look for the #Starscategory.

The following checkboxes should be checked before moving hitting “OK”, and
letting DSS begin its process.

 * Register already registered pictures
 * Automatic detection of hot pixels
 * Stack after registering

The DeepSkyStacker website states that the automatic detection of hot pixels
only works if using Super-pixel, Bayer Drizzle, bilinear and AHD interpolation
modes. However, I leave this box checked regardless and hot-pixels and stacking
errors have never been an issue.


STACKING PARAMETERS

Unless you are experiencing errors in the stacking process, leave all of the
values in the stacking parameter dialogue box unchanged. Yes, this sounds like a
conveniently simple option, but default values are usually set for a reason.

If you want, go ahead and click on the different modes in the “Result” tab. The
program will show you a preview of the final composure created using Mosiac and
Intersection modes. I prefer to use Adobe Photoshop for the final framing and
cropping of the image.

As for the stacking parameters of the light and dark frames, Kappa-Sigma
clipping and Median work well in the Light, Dark, Flat and Bias/Offset
categories. I do not use any additional features such as the detection and
cleaning of hot pixels in the Cosmetic tab.

One setting I do change, however, is the output location folder of the
Autosave.tif file. I prefer that these images populate in a specific folder of
my choice rather than mixed in with a folder of light frames.

Depending on the quality of and amount of light frames available, I usually
select the best 80-90% of pictures and stack them.


READY TO STACK?

You’ve got all of your lights, darks, flats and offset/bias frames loaded. The
default settings are currently selected, and the ever-comforting green bar is
displayed (confirming your use of all support files) But wait, if only there was
a way to confirm all of the files are as they should be.


THE STACKING STEPS WINDOW

Before you run DSS, be sure to check and see if there are any warnings in the
dialogue window. In the case above, there was a single Flat frame with a
miss-matched ISO speed. These warnings are useful for catching little mistakes
in your file organization that can potentially make a big impact on your image.

At this point, you can remove or add any frames based on the information that
DSS has provided.

If all looks well, and there are no more warning messages in the Stacking Steps
window, you can proceed to run the register and stacking process. I enjoy the
information preview about the estimated total exposure time.


DEEP SKY STACKER TUTORIAL (VIDEO)

In the video tutorial below, I walk through some of the basic settings used in
DeepSkyStacker. I then bring the image into Adobe Photoshop for further image
processing.

When DSS has completed its process of registering and stacking all of the image
frames together, a preview of the constructed Autosave.tif file is displayed
onscreen. Based on the design of this software, you would think that the next
logical step would be to make adjustments in the RGB/K Levels, Luminance, and
Saturation area.


STACKING SOFTWARE FOR MACRO PHOTOGRAPHY

If you plan on processing your image in Adobe Photoshop, I recommend leaving
these settings as they are.

Balancing levels, curve adjustments, and boosting saturation are all staples of
an Astrophotography processing workflow in Adobe Photoshop. Photoshop offers
many more options and a higher level of control than Deep Sky Stacker for such
edits.


WHAT ABOUT THE RECOMMENDED SETTINGS OPTION?

DeepSkyStacker has a “Recommended Settings” option that offers suggestions based
on the image files submitted. Some of the recommendations include changing the
stacking mode used such as “Use Median Combination Method”.


FREE FOCUS STACKING SOFTWARE FOR MAC

I have tested both the recommended settings and the default settings and found
the default to produce better results.

If you are determined to see the subtle differences in the final stacked image,
you can go through the entire process using the default Deep Sky Stacker
settings vs. the recommended settings. I found that the recommended settings had
varying results, with fuzzier more washed-out stars than the original stack.

I prefer to try both stacking methods and compare the results on a per-image
basis. You may find that the stacking modes suggested by DSS improve your image.

Below: The Andromeda Galaxy stacked in DeepSkyStacker. Final processing in Adobe
Photoshop.

To view the techniques I use in Adobe Photoshop to finish the image, watch my
image processing tutorial video featuring the Soul Nebula. There is a link in
the description to download the RAW data and process the image yourself.


STACKING WIDE-ANGLE CAMERA LENS IMAGES

Although I mostly use DSS for deep sky images, it is also very useful to stack
wide-angle astrophotos through a camera lens as well. The same signal-to-noise
benefits can be achieved by stacking multiple images together.

You may experience a number of issues when attempting to register and stack
images that include terrestrial elements such as trees or any other terrestrial
landscape. If you are using a star trackerto compensate for the apparent
rotation of the night sky, the ground will blur. If you are using a stationary
tripod (non-tracking), it’s the sky that is moving between each frame.

The photo below was captured using an iOptron SkyGuider Pro to track the night
sky, with a DSLR camera and wide-angle lens mounted on top. As you can see, the
rooftop of my neighbor’s house is blurred, because DSS registered the images
with the moving sky.

An excessive amount of movement between the night sky and the foreground (over
time) can make stacking images like this difficult. One solution is to
photograph the night sky and foreground separately and combine the images
together in Photoshop later.


RECOMMENDED SETTINGS AND TIPS

For my wide-angle shots, I use a modified Canon DSLR with a light pollution
filter. The settings I recommend below will work well for a modified DSLR
shooting through moderate to heavy pollution. Those shooting with a stock DSLR
may have to experiment with these settings to produce a pleasing result.

White Balance Settings

If you are using a modded DSLR, make sure to leave the white balance checkboxes
unchecked. Using an auto white balance or the “camera white balance” with a
modified camera will produce odd results. I would also suggest checking off the
“set the black point to 0″ option.

This should provide you with a final image with a background sky that is much
easier to correct in post-processing. Gradient Xterminator does a great job of
correcting gradients in wide-angle shots of the night sky.


RECOMMENDED SETTINGS

As for DeepSkyStacker’s recommended settings, the graphic below shows you which
ones I like to use on a wide-angle starry sky photo. One of the important
settings is to use Per Channel background calibration – as the RGB background
calibration does a poor job of producing correct colors in my experience.


SCENARIOS AND RECOMMENDED SETTINGS:

 * Scenario: You are processing long exposure and possibly good SNR images
 * Recommendation: Use AHD debayering

 * Scenario: If you are using a modded DSLR
 * Recommendation:Reset all white-balance settings

 * Scenario: If you are processing narrowband images (especially Ha)
 * Recommendation: Use super-pixel mode

 * Scenario: You are stacking (x amount) of light frames
 * Recommendation: Use Sigma-Clipping combination method

 * Scenario: You are creating a master dark from 31 dark frame(s)
 * Recommendation: Use Sigma-Clipping combination method

 * Scenario: If the resulting images look too gray
 * Recommendation: Use Per Channel Median combination method

 * Scenario: If the color balance in the resulting images is hard to fix in
   post-processing
 * Recommendation: Use RGB background calibration


WHAT TO DO IF DEEPSKYSTACKER CRASHES

I have experienced this issue many times while attempting to register and stack
both RAW image files from a DSLR and .FIT from a CCD camera. It can be a
frustrating experience, especially if you have left your computer to let DSS do
its thing. You come back 20 minutes later to view your stacked image, and
instead, find an error message saying “This program has stopped working” or any
number of other error messages.

I have found that the following steps can decrease your chances of producing an
error using DSS:


1. DON’T RUN OTHER APPLICATIONS WHILE STACKING

I am a multitasker. Usually, I have 5-6 windows open at a time from my Google
Chrome browser to Adobe Photoshop. This all uses RAM on your machine, which DSS
uses to process your image. Give DeepSkyStacker your full RAW capacity to use
during its process.


2. PAY ATTENTION TO THE OPTIONS YOU’VE SELECTED

Certain options, such as “superpixel mode” are very demanding on your system and
have been known to crash. Take a screenshot of your settings used before
stacking, so you can compare results and try another stacking parameter next
time.


3. TRY STACKING FEWER IMAGES

The more frames you stack, the more time and resources DSS will pull from your
machine. Try being more selective with the images you plan to register, and only
include the absolute best images.


4. TRY AN EXTERNAL HARD DRIVE

You can tell DSS to utilize the space available on an external hard drive to
render your images. The temporary files can require up to 100GB of space or more
depending on the number of images in the set. This destination is selected under
Settings > Stacking Settings > Temporary Files Folder.

I hope you were able to learn something new about DeepSkyStacker following my
tutorial. It’s one of the few applications that hasn’t changed very much since I
began using it in 2011, and it continues to deliver consistent results.


ALTERNATIVES TO DEEPSKYSTACKER

Everyone prefers to process and stack their astrophotography images in their own
way. DeepSkyStacker isn’t the only software available to calibrate and stack
your image frames. Here is a list of alternatives to DeepSkyStacker:


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