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hello my name is Frank seckenheim and

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you're watching the Astro photo cast in

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this video I would like to introduce the

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latest version of grep Greer 3.0 which

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now includes AI based noise reduction so

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let's

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go the most important innovation of

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Greer 3.0 is the ability to do noise

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reduction of astronomical images based

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on artificial intelligence this AI D

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noise tool was already available for a

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couple of month through GitHub and some

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of you may have been used it already but

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we've managed now to make it available

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in the cper GUI so let's head over to

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the computer and have a look at the new

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version of Greer with Greer AI D this is

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a new user interface of expert 3.0 maybe

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you already have 3.0.1 up here because I

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recorded the video a few days ago you

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can see that everything has become a

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little clearer the sliders to stretch

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the images and adjust the color

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saturation have now moved down here also

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new is this channel link button you may

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know this function from pix inside I go

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through it step by step and unfold the

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first function here you can load the

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image and I'll do that

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once as soon as the image appears you

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can adjust the stretch factor and the

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color saturation and you can see that

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there are still edges that I should crop

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away first by the way this is extremely

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important for gradient

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removal so I closed the first function

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and open the crop function I adjust the

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image field slightly and Trigger the

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crop

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function that's done and I can open the

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next window and continue with the

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gradient removal you can also select the

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AI functionality here but if you want to

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choose a different method you can of

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course do that too and then the other

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options will pop up but I'll just use

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the AI here and here's the new feature D

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noising there's not much to adjust with

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these AI things that's just in the

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nature of these algorithms you can only

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set the strength of the denosing which

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is set to open .5 by

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default if you are using GRE bird for

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the first time you may see a message

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asking you to download the appropriate

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AI please follow the instructions and

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confirm with yes you may also receive a

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message asking you to select an AI

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version please open the advanced

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settings on the right hand side and

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select the latest version in the

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corresponding fields which I did already

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here now I'll click on the noise button

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and depending on your computer this may

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take a

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while the D noising has been completed

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and we can now click through the

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individual images above here starting

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from the original image to the gradient

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free image and finally we also look at

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the Denis image it may be that the

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brightness of the image changes slightly

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because the background has been denoised

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and the image display in graer is

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calculated ated on the basis of the

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background level this can make it

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difficult to assess the quality of the D

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noising at least that's how I feel I can

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judge this better in stretched images

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but that says nothing about the quality

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of the D noising you can also use D

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noising on stretched images but the AI

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was trained on linear images and should

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therefore deliver the best results here

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not much else has changed in the last

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step you can now save the result and

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that's

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it and download GRE directly from our

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homepage at

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www.grar.com there are download buttons

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for the different operating systems make

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sure that if you have a Mac computer

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there are those with Intel processors

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and those with the so-called silicon

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chips silicon chips uh means M1 M2 Etc

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GRE is also available for Linux you can

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also download Greer directly from GitHub

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where you can also find the release

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notes for example there is information

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about the minimum requirements for Mac

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OS and there is a note for Ubunto users

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under Windows when you start the

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installation a warning message will

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appear something like the computer is

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protected by windows then please click

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on the further information field and

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then open anyway then you can continue

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with the installation and what has been

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new for a while is that there is now a

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proper installer on the Mac you will

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also get a message something like this

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Greer can not be opened because Mac OS

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cannot scan for mare or something like

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this then please click on the Apple at

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the top left of your Mac and go to the

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control panel scroll down a little under

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data protection and security and allow

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Greer to be

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opened you can still use Greer AI

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functions under pigs inside there is a

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script and there's now also a process

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for Greer however I would like to

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emphasize that these are other

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developers unfortunately the Greer team

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cannot provide support for this if you

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have any problems please contact the

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script developers

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directly you can find links in the video

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description you can find the greit

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script in the toolbox it also contains

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other great Scripts which I showed you

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in an earlier video Let's install the

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process together to do this go to

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resources manage

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repositories here you enter the

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following link although it is important

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that you put the backlash at the end do

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not open this link in an internet

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browser it is just a repository link you

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confirm twice with okay and now carry

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out the actual app date therefore you

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have to shut down pix inside and reopen

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it and then the uh

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grep process will be

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installed in the processes menu you will

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actually find a Greer

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process I once loaded an image and

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Trigger the screen transfer function I

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will now first start the gradient

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removal and I will also have the

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background model

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output after a short time we get the

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result and the background is also shown

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to us which we can make it appear a

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little bit smoother in the next step I

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carry out the den noising here with the

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maximum

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value that took a while but we compare

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the result with the original image and

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see that there was a lot of the noising

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again under the video in the video

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description you will find all the

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necessary

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links a few more words about training

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the D noise AI in order to ensure D

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noising that looks as natural as

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possible we trained the AI according to

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the following idea we took images that

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were exposed for a very long time and

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then only took a subset a small portion

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of these exposures and stacked them as

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well well so we have two stacks one with

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the full exposure time and one will say

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about A fifth or so of the exposure time

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if you look at these images you see

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exactly the same image twice but of

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course there's more noise in the shter

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St we trained the AI with exactly these

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pairs of images and so we managed to

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create an AI that shows d noising as

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naturally as

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possible and one more thing all the

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develop velers of greir and also of

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these scripts are working in their free

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time on the weekends to provide you some

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wonderful software which cost you

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nothing so if you encounter any problems

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with G grur or the Pix inside scits

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please uh bear with us and be patient

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and we try to help you as best as we can

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but sometimes yeah it's a little bit

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difficult to um to find a way to solve

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the the problems and it might take some

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time to solve some problems so please be

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patient with us I hope you enjoyed the

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video so have fun with the latest

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version of Greer and Greer do noise and

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see you next time bye-bye