https://github.com/sapics/scale.js

High-quality scale function for canvas and image element. If scale factor < 1, then algorithm for downscale (area average) is used, other than that, bicubic algorithm is used.
https://github.com/sapics/scale.js

bicubic-algorithm canvas downscale image javascript scale

Last synced: 16 days ago
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High-quality scale function for canvas and image element. If scale factor < 1, then algorithm for downscale (area average) is used, other than that, bicubic algorithm is used.

• Host: GitHub
• URL: https://github.com/sapics/scale.js
• Owner: sapics
• License: mit
• Created: 2015-04-11T10:45:37.000Z (over 9 years ago)
• Default Branch: main
• Last Pushed: 2020-07-13T06:02:37.000Z (over 4 years ago)
• Last Synced: 2024-10-14T12:53:41.032Z (30 days ago)
• Topics: bicubic-algorithm, canvas, downscale, image, javascript, scale
• Language: JavaScript
• Homepage:
• Size: 39.1 KB
• Stars: 50
• Watchers: 5
• Forks: 19
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# scale.js

High-quality scale function for canvas and image element.

If scale factor < 1, then algorithm for downscale is used, other than that, bicubic algorithm is used.

## How to use

Please use dist/scale.min.js, because src/scale.js dose not work.

    

      

      

      

      

      

      

      (function(){

        var inputCanvas = document.getElementById("inputCanvas");

        var inputImage = document.getElementById("inputImage");

        var newCanvas1 = scale(0.7,

                               inputCanvas);

        var newCanvas2 = scale({scaleX:1.7, scaleY:1.4},

                               inputImage,

                               document.getElementById("exportCanvas2"));

        var jpegImage  = scale({width:100, height:200},

                               inputCanvas,

                               'jpeg');

        var pngSrc     = scale(0.7,

                               inputCanvas,

                               'png-src');

      })();

      

    

## Licence

MIT Licence