ohjho

Replace a color with transparency

for example, to convert white to transparent

convert target.png -transparent white result.png

if not perfectly white:

convert target.png -fuzz {}% -transparent white result.png

where the smaller the fuzz %, the closer to true white or conversely, the larger the %, the more variation from white is allowed to become transparent.

ohjho

Building PyTorch from Master/ Source using VirtualEnv

with reference to this

make sure that you have cloned the PyTorch repo. Let's assume that we'll install into ~/git/

$ cd ~/git
$ git clone --recursive https://github.com/pytorch/pytorch.git

activate your Python3 virtualenv and install PyTorch requirements

ohjho

PIP

installing from Git Repo

in general the command is as follows but see this blog post for the most detailed explanation:

pip install git+https://github.com/user/repositor.git@branch#subdirectory=src

• note that the @branch is completely optional
• also #subdirectory=src is also optional (sometimes the project to install is not in the root of the repo, e.g. Streamlit)
• either options like --ignore-requires-python might be useful if you think the python version requirement is not neccessary

ohjho

Find Differences in two Text Files

grep -Fxvf file1 file2

Flags mean:

-F, --fixed-strings
              Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be matched.    
-x, --line-regexp

ohjho

Installation

MacOS

Get FFMPEG with all the options which is a little more complicated in brew because the Homebrew team removed all options from the core formula:

brew update
brew uninstall --force --ignore-dependencies ffmpeg
brew install chromaprint amiaopensource/amiaos/decklinksdk
brew tap homebrew-ffmpeg/ffmpeg
brew upgrade homebrew-ffmpeg/ffmpeg/ffmpeg $(brew options homebrew-ffmpeg/ffmpeg/ffmpeg | grep -vE '\s' | grep -- '--with-' | grep -vi chromaprint | tr '\n' ' ')

ohjho

grep -R --exclude-dir=node_modules 'some pattern' /path/to/search

grep -R --exclude-dir={node_modules,.git} 'some pattern' /path/to/search

ohjho

find . -type f -iname "*.jpg" -exec identify -format '%w %h %i\n' {} \; |
awk '$1 > 1200 || $2 > 1200 {sub(/^[^ ]* [^ ]* /, ""); print}' |
tr '\n' '\0' |
xargs -0 mogrify -resize '1200x1200'

ohjho

convert foo.png -crop 640x480+50+100 out.png

ohjho

convert original.jpg -fuzz 15% -fill "#84BE6A" -opaque "#d89060" new.jpg

ohjho

git rev-list --objects --all \
| git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' \
| sed -n 's/^blob //p' \
| sort --numeric-sort --key=2 \
| cut -c 1-12,41- \
| $(command -v gnumfmt || echo numfmt) --field=2 --to=iec-i --suffix=B --padding=7 --round=nearest