The pnglib from georgechan

pnglib's Introduction

#PNGLib A PNG lib for Node.js

A handy class to calculate color values.

 version 1.0
 author Robert Eisele <[email protected]>
 copyright Copyright (c) 2010, Robert Eisele
 link http://www.xarg.org/2010/03/generate-client-side-png-files-using-javascript/
 license http://www.opensource.org/licenses/bsd-license.php BSD License

Modified by George Chan [email protected]

##Install

npm install pnglib

##Examples

var pnglib = require('pnglib');
var p = new pnglib(300,100,8);
var lineIndex = p.index(10,25);
p.buffer[lineIndex+j]='\x01';
p.color(0, 0, 0, 0);  // First color: background (red, green, blue, alpha)
p.color(80, 80, 80, 255); // Second color: paint (red, green, blue, alpha)

More example see: https://github.com/GeorgeChan/captchapng

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pnglib's Issues

只支持调色板

大神，你这个版本不支持RGBA32啊，请问有没有能支持32位的版本？

Make an size optimized black and white png

Is there anyway you could help me with a quick question? I want to figure out how to do a single bit color, just black and white png, so that it can be smaller. I tried adjusting the color-depth, but the file is always: PNG image data, 200 x 200, 8-bit colormap, non-interlaced and the same size, even if I pick 1,2,4,8 for the color depth.

Octal literal can not compile in strict mode.

This piece of code.

        // convert PNG to string
        return "\211PNG\r\n\032\n"+this.buffer.join('');

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