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I've noticed some files I opened in a text editor have all kinds of crazy unrenderable chars

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[–] [email protected] 8 points 1 month ago* (last edited 1 month ago) (1 children)

If you're on Linux, you can convert that to something more human readable by piping it to base64. It works with any file, but I'll use an image here:

cat image.webp | base64

Which yields:
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Copy that into a text file and pass it to base64 with the decode flag, and you'll get the original binary:

cat data.txt | base64 -d > data.bin

Inspect it to see what kind of file it is:

file data.bin -> data.bin: RIFF (little-endian) data, Web/P image

Rename it so you can just double-click it to open it:

mv data.bin data.webp

Enjoy the surprise.

You can also print files like that, scan them using OCR, and then restore them. A very inefficient way to do backups, but it works.

[–] cheese_greater 3 points 1 month ago (2 children)

How is it representing it tho? Like does it have woven in there an array of hexcode colors for every microscopic pixel that makea up the picture.

Are images and audio files just arrays of frames which are arrays of pixels and sound units?

[–] [email protected] 4 points 1 month ago* (last edited 1 month ago)

It just converts the raw binary data into character encoding, so it doesn't matter what the source is (image, video, database file, etc). The source binary data is taken 6 bits at a time, then this group of 6 bits is mapped to one of 64 unique characters.

The decoding process is just the reverse of that: mapping the data back to binary form.

https://en.wikipedia.org/wiki/Base64

[–] Num10ck 2 points 1 month ago

the answer to your how question is as needed.

some image and audio formats (especially older ones) are like that, yes. others use compression or other techniques to suit their need. like a sound can be a raw recording sample. or a sound can be described with Attack/Decay/Sustain/Release, along with octave and note etc. so a MIDI file is an audio file format without samples.

i once created an image format to be used for spiraling out images, instead of pixel arrays they were concentric circles of pixels that i could easily offset.