https://github.com/sug0/go-glitch
A go package to glitch images based on input expressions
https://github.com/sug0/go-glitch
art glitch go golang gopher image trippy
Last synced: 12 months ago
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A go package to glitch images based on input expressions
- Host: GitHub
- URL: https://github.com/sug0/go-glitch
- Owner: sug0
- Created: 2018-04-07T02:01:27.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2021-04-30T14:12:17.000Z (about 5 years ago)
- Last Synced: 2025-04-02T19:51:42.486Z (about 1 year ago)
- Topics: art, glitch, go, golang, gopher, image, trippy
- Language: Go
- Size: 38.1 KB
- Stars: 7
- Watchers: 1
- Forks: 3
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
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README
# Go Glitch
A go package to glitch an image based on an expression you pass in as input!
The only limit is your creativity (and patience)!
## Discord
[Join our discord server!](https://discord.gg/cUW4b6Z)
# What is the deal with the expressions?
You can think of the image as a functor that you map an expression to, for each pixel's component colors,
returning a new one. The allowed operators are:
* `+` plus
* `-` minus
* `*` multiplication
* `/` division
* `%` modulo
* `#` power of operator
* `&` bit and
* `|` bit or
* `:` bit and not
* `^` bit xor
* `<` bit left shift
* `>` bit right shift
* `?` returns 255 if left side is greater otherwise 0
* `@` attributes a weight in the range `[0, 255]` to the value on the left
The expressions are made up of operators, numbers, parenthesis, and a set of parameters:
* `c` the current value of each pixel component color
* `b` the blurred version of `c`
* `h` the horizontally flipped version of `c`
* `v` the vertically flipped version of `c`
* `d` the diagonally flipped version of `c`
* `Y` the luminosity, or grayscale component of each pixel
* `N` a noise pixel (i.e. a pixel where each component is a random value)
* `R` the red color (i.e. rgb(255, 0, 0))
* `G` the green color (i.e. rgb(0, 255, 0))
* `B` the blue color (i.e. rgb(0, 0, 255))
* `s` the value of each pixel's last saved evaluated expression
* `r` a pixel made up of a random color component from the neighboring 8 pixels
* `e` the difference of all pixels in a box, creating an edge-like effect
* `x` the current x coordinate being evaluated normalized in the range `[0, 255]`
* `y` the current y coordinate being evaluated normalized in the range `[0, 255]`
* `H` the highest valued color component in the neighboring 8 pixels
* `L` the lowest valued color component in the neighboring 8 pixels
## Examples
* `128 & (c - ((c - 150 + s) > 5 < s))`
* `(c & (c ^ 55)) + 25`
* `128 & (c + 255) : (s ^ (c ^ 255)) + 25`
More examples can be found
[here](https://github.com/sugoiuguu/go-glitch/blob/master/res/cool.txt).
# Command line tool usage
Use the [docker image](https://hub.docker.com/r/sugoiuguu/go-glitch/):
$ docker run sugoiuguu/go-glitch
# API usage
```go
package main
import (
"os"
"time"
"math/rand"
"image"
"image/png"
_ "image/jpeg"
"github.com/sugoiuguu/go-glitch"
)
func main() {
f, err := os.Open(os.Args[2])
if err != nil {
panic(err)
}
defer f.Close()
f2, err := os.Create(os.Args[1])
if err != nil {
panic(err)
}
defer f2.Close()
img, _, err := image.Decode(f)
if err != nil {
panic(err)
}
rand.Seed(time.Now().UnixNano())
expr, err := glitch.CompileExpression("(n|(c > 1)) ^ 128")
if err != nil {
panic(err)
}
g, err := expr.JumblePixels(img)
if err != nil {
panic(err)
}
png.Encode(f2, g)
}
```
# C/C++ interface
There is an experimental interface for C/C++ code
[here](https://github.com/sugoiuguu/go-glitch/blob/master/example/ffi.go).
The API is:
```c
typedef struct {
char *data;
size_t size;
} Image_t;
extern Image_t *jumble_pixels(char *expression, char *data, int size);
```