Layer Modes, sometimes called Blending Modes, allow you to combine layers in a variety of ways. We continue with the Darken Modes, except for Burn, which was covered in the previous tutorial. Darken modes do what they say on the tin, they make things darker, and so they are kind of the inverse of the Lighten Modes. These are the Layer Modes available on the latest (at the time I write this) version of GIMP, 2.10.24. I also take the time to discuss image formats such as JPG, PNG, and RAW.

Links:

https://www.ahuka.com/gimp/lighten-layer-modes/

https://en.wikipedia.org/wiki/Portable_Network_Graphics

https://en.wikipedia.org/wiki/JPEG

https://en.wikipedia.org/wiki/Raw_image_format

https://www.youtube.com/watch?v=XbcA9iSTudY

https://daviesmediadesign.com/project/open-raw-images-gimp-2-10/

https://en.wikipedia.org/wiki/Dodging_and_burning

https://docs.gimp.org/2.10/en/gimp-concepts-layer-modes.html

https://www.ahuka.com/gimp/darken-modes/

In this episode our two heroes contemplate the ins and outs of version

control systems (VCS) and how to maintain sanity using them. Particular focus

is on the newer generation of such as git which enabled large-scale community

projects such as the Linux kernel, programming languages like Rust and Python

and other shenanigans. Including a crash course on version control systems

- you may credits at your local third-level education facility for listening

to this episode. Just tell them the Inlaws sent you :-). Plus Martin reveals

his favourite Pay TV channel and his gun-buying habits being a minor. Don't

miss this episode if you're a minor and want to buy a gun in certain countries

(details as part of the episode! :-).

Links:

V-Model: https://en.wikipedia.org/wiki/V-Model

Mercurial: https://www.mercurial-scm.org

Concurrent Version Control System (CVS): http://cvs.nongnu.org

Minix: http://www.minix3.org

Bazaar: https://bazaar.canonical.com/en

Subversion (SVN): https://subversion.apache.org

Git: https://git-scm.com

Bitkeeper: http://www.bitkeeper.org

IBM 390: https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP9000.html

gitea: https://gitea.io

Special K: https://en.wikipedia.org/wiki/Special_K

Special K (song): https://en.wikipedia.org/wiki/Special_K_(song)

Special K (former country, the Wikipedia page is slightly outdated): https://en.wikipedia.org/wiki/United_Kingdom

Imperium: https://www.imdb.com/title/tt4781612/?ref_=fn_al_tt_2

In this episode I take you along for the ride as I hack the wiring in a classroom podium so that I can show musical scores on the Elmo document camera while playing audio through the podium's laptop VGA audio source. Without this hack, the students could either see the score, or they could hear the music, but not both. This simple hack installing two jumper wires allows them to see the score and hear the music at the same time, which is important in my classes. I could already do this by using a PDF music score on my laptop while playing the audio file, but this allows me to use a paper score and audio from my laptop at once. It essentially acts as an audio splitter, sending the audio signal to two channels at once.

Links

Music from Kimiko Ishizaka's The Open Well-Tempered Clavier: https://www.welltemperedclavier.org/, used by permission of its CC0 1.0 Universal (CC0 1.0) Public Domain Dedication license.

Pictures of the Podium Audio Wiring Hack

arduino as a sketch download pdf at wiki.forth-ev.de, then cut and paste $

the arduino controlled by eforth, search for this ter$

amforth

amforth.sourceforge.net

flashforth

flashforth.com

resources

arduino-forth.com

forth.org

forth.org/eforth.html

Get app password and enter it in a file call pass

set my_gpass= "MyAppPassword"

Encrypt pass file with 'gpg -e pass'

Shred pass file with 'shred -uv pass', which uses verbose mode

shred - overwrite a file to hide its contents, and optionally delete it

-u deallocate and remove file after overwriting

-v, --verbose, show progress

Use gpg encrypted key to open Gmail

in .muttrc source "gpg -d ~/.mutt/pass.gpg |"

Source colors file: Custom color scheme

## Custom - Shows a gray line on tagged emails

color index yellow brightblack "~T ~N | ~T"

Tagged emails

Source hooks file: Redirect default save path for email sorting

## Newsletters - Technology ##

save-hook '~f lists.linuxjournal.com' ='Linux'

save-hook '~f arch-dev-public' =Newsletters

save-hook '~f [email protected]' =Newsletters

save-hook '~f [email protected]'|'~b Opencourseware' =Newsletters

save-hook '~s Linux'|'~s Foundation' ='Newsletters'

save-hook '~f [email protected]' =Newsletters

save-hook '~f [email protected]' =Newsletters

save-hook '~f @pragmaticbookshelf.com' =Newsletters

save-hook '~f [email protected]' =Newsletters

save-hook '~f [email protected]' =Newsletters

save-hook '~f [email protected]' =Newsletters

save-hook '~f mark ~s arduino' =Bookmarks/Arduino

save-hook '~f [email protected]' =Newsletters/TorProject

save-hook '~f [email protected]' =Newsletters/TorProject

save-hook '~f [email protected]' =Newsletters.EFFdotOrg

save-hook '~f [email protected]' =Newsletters/DIYODE-Magazine

save-hook '~f [email protected]' =Newsletters/Circuits

## Recipes ##

save-hook '~f dora ~s Recipe | ~s Recipe | ~B recipe | ~B casserole | ~B bake | ~B "omaha steaks" ' ='dabrat1972/Recipes'

Source aliases file: Frequently used contacts

alias tags [email protected]

alias Dave_Morriss Dave Morriss <[email protected]>

HTML email

Install lynx

Open URL's

Install urlscan

Capital 'U' open URL dialog

Open pictures

Install feh

PDF reader

Zathura

https://bbs.archlinux.org/viewtopic.php?id=220572

Install zathura-pdf-mupdf and zathura-pdf-poppler

Just needed zathura-pdf-mupdf, zathura-pdf-poppler was included with zathura.

mailcap - metamail capabilities file

DESCRIPTION

The mailcap file is read by the metamail program to determine how to display non-text at the local site.

image/*; feh %s; test=test -n "$DISPLAY";

text/html; lynx -nonumbers -dump %s; copiousoutput; nametemplate=%s.html

application/pdf; zathura /dev/stdin

More reading

Regex question

https://www.techrepublic.com/artic

I've been using this setup or one similar for several years now and it has worked out very well.

Hardware:

Clearstream TV antenna

Coax cable

Hauppage WinTV-dual HD USB Dual Tuner

Raspberry Pi 4 4GB

1 TB SSD connected via USB 3

HDMI cable

Software:

Libreelec OS

Kodi

TVheadend server

TVheadend client

Debrid addon media streamer

Any questions or comments you can reach me at minnix at minnix dot dev

https://matrix.to/#/#HPR:matrix.org

media > text > keywords

https://github.com/freeload101/SCRIPTS/blob/master/Bash/Stream_to_Text_with_Keywords.sh

NICE !

http://hackerpublicradio.org/rss-future.php

broken ?

http://gitlab.anhonesthost.com/HPR/HPR_Public_Code/ ( broken ? )

Donate!

https://secure.anhonesthost.com/store/hpr-hosting-cost-donations

android compressor / limiter

https://play.google.com/store/apps/details?id=io.github.kushiheim.glycox

notes on Linux Audio

https://docs.google.com/document/d/1E1xAwWpq-C4vEh8LCRw7MD7jnaclX9Faf2L3dZWiqQY/edit#heading=h.wp1n4j8ybidv

possible automated silence detection to be used for noise profile !!!! ( let's talk about it ! )

https://stackoverflow.com/questions/45526996/split-audio-files-using-silence-detection/46001755

Opening

Hello, my name is Dave, and welcome to another exciting episode of Hacker Public Radio. It's been a couple of years since my last episode, and I know that HPR is running low on shows. As I have had this one in planning for some time now, I though this was the right time to get it finished.

Main

At the time of recording this, I've been an Amateur Radio licence holder for 6 months. I took the notion of studying and applying for my Foundation licence (the first of three stages to a Full licence) when I read a blog post by Jon Spriggs G7VRI, back in March, entitled Might Amateur Radio be a hobby for you? I saw a presentation by Jon at OggCamp in 2018 in Sheffield where he gave a whistle-stop tour of what Amateur Radio actually is, and how easy it is to get involved in it.

As a bit of background, I was quite involved in the CB Radio scene back in the late 80s and early 90s - I was introduced to CB by my dad, whose handle was "Screwball", in the 70s... he had a CB rig in his car since as far back as I can remember. I picked up the hobby from him, by actually liberating him of his rig when he stopped using it. Unfortunately it got stolen from my car. C'est la vie. Yes, my handle back then was "The Love Bug" - in fact, it was whilst looking for an alternative to "Kool Kat" as a handle that I first used the moniker "The Love Bug" - probably in the mid-80s - and it just stuck.

So, after reading Jon's blog post, and doing some research into Amateur Radio myself, a whole bunch of things happened at the same time: I bought my first radio - a Baofeng UV-5RTP [Amazon UK], I joined the Radio Society of Great Britain (not a requirement, but I would recommend it), signed up for Essex Ham's Foundation Training Course (not a requirement, but strongly recommended as it's geared around the examination, and it's free!)

The training took 3 weeks (in my own time), and I applied for my exam as soon as the training was complete. The exam was an hour long, under as close to exam conditions as an online exam would allow, and I was told by the online system that I'd passed as soon as I submitted my answers. It then took a few days to get the confirmation of passing (and a certificate) in the post, which then allowed me to apply to Ofcom (the authority for the radio spectrum here in the UK) for my licence and callsign. I was able to choose the suffix of my callsign, and - as BUG was taken - I opted for TLB (for The Love Bug), and thus my callsign is - currently - M7TLB (Mike Seven Tango Lima Bravo). I say "currently" - I'm not allowed to change my callsign, however the callsign is specific not only to me but also to the fact that I'm a Foundation Licence holder. Therefore, when I go for my Intermediate and then Full licence, I'll get new callsigns for each one, each superseding the previous.

Anyhoo, once I got my Foundation licence, I went out that Sunday to log some contacts, or QSOs. So I parked up at a high point near to here, put a small aerial on the roof of the car (so that I didn't warm up my head when transmitting), and started calling CQ - essentially a way of saying "I want to talk to somebody" - "Seek You". As part of the licence conditions, you are only permitted to make contact with other identifiable and identified amateurs... general

AQI

Air Quality Index - measures particles in the air

Ozone

good at high altitudes

bad on the earth surface https://en.wikipedia.org/wiki/Ozone#Low_level_ozone

PM2.5

Particulate Matter, 2.5 micrometers https://en.wikipedia.org/wiki/Particulates#Size,_shape_and_solubility_matter

https://en.wikipedia.org/wiki/Particulates#Wildfire_smoke_risk

Getting AQI data

Determining air quality in my area is as simple as visiting https://www.airnow.gov and entering my zip code. Although my zip code covers 139.56 square miles, the result is accurate enough for my needs. When my zip code was submitted, the web page did not refresh. This means that the client interface made an API call to the backend server.

It sure would be nice if the AQI status was emailed to my phone every hour, if the AQI was above a certain threshold.

In order to get the data from the API, it is necessary to emulate the request made by the client to the API. This can be accomplished using Firefox.

open Firefox

go to https://www.airnow.gov

open the Firefox developer tools, either through the menu or with CTRL+SHIFT+i

in the dev tools, select the Network tab

enter the zip code in the form and submit

watch the Network tab for a POST request to https://airnowgovapi.com/reportingarea/get

click on the request in the network tab

Another set of tabs are now available to display various bits of information regarding the request. From this data, it is possible to recreate the query.

However, I took an even easier route, and right-clicked on the query in the Network tab, and selected Copy > Copy as cURL to get the request as a curl command complete with all necessary arguments prefilled. Since I didn't want to write my entire AQI fetching script in bash, I copied the curl command into a text file and ported the request to Ruby.

The Finished Script

#!/usr/bin/env ruby

require 'net/http'

require 'uri'

require 'json'

uri ="https://airnowgovapi.com/reportingarea/get"

parsed_uri = URI.parse(uri)

payload={latitude:39.88,longitude:-120.76,stateCode:'CA',maxDistance:50}

response = Net::HTTP.post_form(parsed_uri, payload)

data = JSON.parse(response.body)[0]

aqi=data["aqi"].to_i

category=data['category']

parameter=data['parameter']

output= "#{parameter}: #{aqi} - #{category}"

puts output

/opt/textjezra "#{output}"` if aqi > 70

This episode is just a quick talk about one of my favorite legacy audio devices, my Sony FM/AM cassette Walkman, model WM-F41.

Links

Sony Walkman WM-F41

Behringer Xenyx 502 Mixer

Music is from Kimiko Ishizaka's The Open Art of Fugue: https://music.kimiko-piano.com/album/j-s-bach-the-art-of-the-fugue-kunst-der-fuge-bwv-1080, used by permission of its CC0 1.0 Universal (CC0 1.0) Public Domain Dedication license.