raw_spec

Create a specification for how raw bytes should be interpreted when passed
to <code>write_png()</code>

Read and write PNG images with arrays, rasters, native
rasters, numeric arrays, integer arrays, raw vectors and indexed
values. This PNG encoder exposes configurable internal options
enabling the user to select a speed-size tradeoff. For example,
disabling compression can speed up writing PNG by a factor of 50.
Multiple image formats are supported including raster, native rasters,
and integer and numeric arrays at color depths of 1, 2, 3 or 4. 16-bit
images are also supported. This implementation uses the 'libspng' 'C'
library which is available from
<https://github.com/randy408/libspng/>.

Mike Cheng

fastpng

Read and Write PNG Files with Configurable Decoder/Encoder
Options

Randy408 

The PNG Reference Library Authors 

Cosmin Truta

Glenn Randers-Pehrson

Andreas Dilger

Guy Eric Schalnat

Mike Klein

Matt Sarett

James Yu

Mars Rullgard

Arm Holdings 

Richard Townsend

raw_spec function

<dl><dt>width, height</dt>
<dd>image dimensions</dd>
<dt>depth</dt>
<dd>number of colour channels. Integer value in range [1, 4]</dd>
<dt>bits</dt>
<dd>number of bits for each colour channel. Either 8 or 16.</dd></dl>

Arguments

Create a specification for how raw bytes should be interpreted when passed
to write_png() — raw_spec

<dl>

<dt>width, height</dt>
<dd>image dimensions</dd>


<dt>depth</dt>
<dd>number of colour channels. Integer value in range [1, 4]</dd>


<dt>bits</dt>
<dd>number of bits for each colour channel. Either 8 or 16.</dd>

</dl>

Create a specification for how raw bytes should be interpreted when passed
to <code>write_png()</code>

raw_spec: Create a specification for how raw bytes should be interpreted when passed to `write_png()`

Description

Usage

Value

Arguments

Examples