To add, update or remove a test file, please update the list below.
Please provide full reference and steps to generate the test file so that any people can regenerate or update the file in the future.
Generated using MSPaint like a true professional.
Lossless encoding must be used to ensure colors are perfect.
avifenc -l four-colors.png -o four-colors.avif
Lossless encoding must be used to ensure colors are perfect.
ffmpeg -i four-colors.png -lossless 1 -y four-colors.webp
High quality encoding must be used to ensure colors are perfect.
cp four-colors.png four-colors2.png gifski -o four-colors.gif four-colors*.png
High quality encoding must be used to ensure colors are perfect.
ffmpeg -i four-colors.png -vf "rotate=PI" four-colors2.png gifski -o four-colors-flip.gif four-colors*.png
Used Sqoosh.app with MozJPEG compression then used exiftool to add an orientation marker.
exiftool -Orientation=1 -n four-colors.jpg
Used a custom tool to convert four-colors.avif into a .mp4 file.
