LEPTONICA(3)

💖 LEPTONICA 💖

okay bestie, sit DOWN, because today we're talking about leptonica, the image processing library — and yes, it's giving main character energy in section 3 of the manual, we love that for her 🎀

---

✨ SYNOPSIS ✨

like, here's literally all you need to get started:

#include <leptonica/allheaders.h>

cc file.c -llept

one include, one link flag, and you're in. no cap. 💅

---

🌸 DESCRIPTION 🌸

so this page is here to give you the lowdown on the leptonica image processing library. short version, but we're covering it fr fr.

Leptonica is a well-tested C library for some basic image processing operations — and it also comes with a description of the functions and some design methods, because she's thorough like that. 💖

the way that she ships a full set of affine transformations — that's translation, shear, rotation, and scaling — on images of all depths?? iconic. the one tiny caveat bestie: some of the scaling methods do not work at all depths, so don't come for her when that happens, she told you upfront. 😭

she also has implementations of:

• binary morphology
• grayscale morphology
• convolution and rank order filters
• and applications like jbig2 image processing and color quantization

and because she's a whole queen of organization, you also get basic utilities for the safe and efficient handling of:

• arrays — of strings, numbers, number pairs, and image-related geometrical objects
• byte queues
• generic stacks
• generic lists
• and endian-independent indexing into 32-bit arrays ✨

like she really said "let me handle ALL of it" and then did. obsessed. 👑

---

🎀 OPTIONS 🎀

okay so most of the example programs that come with leptonica will report their usage if you try to run them on the command line with no arguments. super handy, love that for us.

usage varies from program to program though, so don't expect them all to behave identically — they're individuals, they have personalities. 💅

heads up bestie: these are sample programs. if you're trying to do something similar, go read their source code. fr fr, that's the move. 📖

---

🦋 SEE ALSO 🦋

go give these lil siblings some love:

• convertfilestopdf(1)
• convertfilestops(1)
• convertformat(1)
• convertsegfilestopdf(1)
• convertsegfilestops(1)
• converttopdf(1)
• converttops(1)
• fileinfo(1)
• xtractprotos(1)

and the library and sample programs are documented more fully by http://www.leptonica.com, which you can reach via your favorite web user agent. go touch some hyperlinks, bestie. 🌈

---

👑 AUTHOR 👑

leptonica was written by Dan Bloomberg <bloomberg@ieee.org> — we stan a legend. 💜

this manual page was written by Jeff Breidenbach <jab@debian.org>, for the Debian project (but may be used by others). sharing is caring, periodt. 🫶

---

aaaaand that's the whole vibe check! this page is from the Library Functions Manual, dated June 27, 2006, and she lives at LEPTONICA(3) forever and always. mwah, go process some images, you got this ✨💖🎀🦋