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Example code of net-tools/gd-indexed-color-converter

Informations about the package gd-indexed-color-converter

GDIndexedColorConverter

GDIndexedColorConverter is a simple library that convert an image into indexed color mode. With indexed color mode, an image can be displayed with only a few specific colors.

To archieve image dithering effect, GDIndexedColorConverter uses [Floyd–Steinberg dithering] (http://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering) algorithm to apply error diffusion of each pixel onto its neighboring pixels.

Requirements

Since GDIndexedColorConverter uses some functions of the GD extension, you need to the enable GD extension in the PHP configuration file (php.ini).

Usage

GDIndexedColorConverter provide a function named convertToIndexedColor to convert an image into indexed color mode, it accepts three parameters(listed below), and return a new image resource of indexed color mode.

Code example:

Dithers

Applying different dither values on indexed-color images, you can get various image effects. In the example folder, there is a simple example that creates three indexed images with different dither values(0.2, 0.4, 0.8) and five colors(white, black, red, green and blue).

Example Output

The example image shell.jpg is created by @sage_solar. The image is under Creative Commons License.

License

GDIndexedColorConverter is licensed under the [MIT license] (https://raw.githubusercontent.com/ccpalettes/gd-indexed-color-converter/master/LICENSE).

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