farbfeld

farbfeld is a lossless image format which is easy to parse, pipe and
compress.
It has the following format:

| Bytes | Description |
|--------|------------------------------------------------------------|
| 8 | "farbfeld" magic value |
| 4 | 32-Bit BE unsigned integer (width) |
| 4 | 32-Bit BE unsigned integer (height) |
| [2222] | 4⋅16-Bit BE unsigned integers [RGBA] / pixel, row-aligned |

http://tools.suckless.org/farbfeld/

Why 32 bit? Why not 36 bit? How am I supposed to make an efficient implementation in my PDP 10?
Why RGBA? What if I want to use a better format? And why should I be limited to 64-bit-per-color?

Dependencies
libpng
libjpeg-turbo

In turn libpng depends on zlib
Now, I question, why does something that simple that even a kid could make depend on them? And why on libpng and zlib specifically, considering that they are not suckless at all.