picto 0.4.4

Image handling library.
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picto
=====
[![Crates.io](https://img.shields.io/crates/v/picto.svg)](https://crates.io/crates/picto) [![Crates.io](https://img.shields.io/crates/d/picto.svg)](https://crates.io/crates/picto) ![WTFPL](http://img.shields.io/badge/license-WTFPL-blue.svg) [![Build Status](https://api.travis-ci.org/kbknapp/clap-rs.svg?branch=master)](https://travis-ci.org/meh/rust-picto)

An image handling library.

Usage
-----
Add the following to the `Cargo.toml` in your project:

```toml
[dependencies]
picto = "0.2"
```

Supported Formats
-----------------
| Format | Decoding | Encoding |
|--------|----------|----------|
| PNG    | ✔        | ✔        |
| JPEG   | ✔        | ✘        |
| GIF    | ✔        | ✔        |
| BMP    | ✔        | ✔        |
| TGA    | ✔        | ✔        |
| XYZ    | ✔        | ✘        |

Documentation
-------------
Documentation is available [here](https://docs.rs/picto).

Example
-------
The following example turns an image to gray scale (maintaining the alpha),
then upscales it, and blurs it.

```rust
extern crate picto;
use picto::{read, write};
use picto::color::{Rgba, Lumaa};
use picto::processing::prelude::*;

use std::env;

fn main() {
  write::to_path(env::args().nth(2).unwrap(),
    &read::from_path::<u8, Rgba, _>(env::args().nth(1).unwrap()).unwrap()
      .convert::<u8, Lumaa>()
      .scale_by::<scaler::Cubic, u8, Rgba>(2.0)
      .blur::<u8, Rgba>(4.0)).unwrap();
}
```

sRGB and friends
----------------
The RGB types and operations provided by picto assume the colors are given in
linear RGB space, but many images contain the data in sRGB color space, this
means some conversion needs to happen to have accurate operations.

The following code will load an image, and convert it to a `Buffer` usable from
an sRGB space.

```rust
use picto;
use picto::color::{Rgb, Srgb};

let image = picto::read::from_path::<Rgb, u8, _>("path-to-image.jpg")
  .convert_with::<Rgb, f32, _>(|p| Srgb::new(p.red, p.green, p.blue).into());
```