Error decoding image

[EvantheGrump]

Hello, I'm trying to decode an image outputted by tiramisu. This is my current workflow:

tiramisu -j | jq -r '.hints."image-data"' > file.txt

I either manually or automatically using awk -F":" '{print (NF>1)? $NF : ""}' remove the prepending data from the base64 I'm attempting to decode:

640:640:2560:true:8:4:/8fs///H7P//x+z//8fs///H6v//x+r//8fq///H6v//x+r//8fq///H6v/...
to /8fs///H7P//x+z//8fs///H6v//x+r//8fq///H6v//x+r//8fq///H6v/...

then, I cat the file and plug it into the base64 command: cat file.txt | base64 -d > image.raw

however, the resulting .raw image file cannot be read, converted, or viewed by any application I've tried to use. The mime type of the file reports application/octet stream, and using imagemagick with either of the following commands results in the subsequent error:

[evan@evan-arch ~]$ magick -size 640x640 -depth 8 rgb:image.raw output.png magick: unexpected end-of-file 'image.raw': No such file or directory @ error/rgb.c/ReadRGBImage/248.

[evan@evan-arch ~]$ magick -size 640x640 -depth 8 -format rgb image.raw output.png magick: Unsupported file format or not RAW file `image.raw' @ error/dng.c/ReadDNGImage/504.

I've attached the base64 encoded file below, while keeping the resolution/alpha/depth data attached in front. I'm hitting a wall, and don't know what to do next. Any help you provide is greatly appreciated! Thanks for your time.

file2.txt