A TileStrata plugin for manipulating and transcoding tile images with GraphicsMagick via gm.

$ npm install tilestrata-gm --save

var gm = require('tilestrata-gm');

server.layer('mylayer')
	.route('tile-contrast.png')
		.use(/* some provider */)
		.use(gm(function(image) {
			return image.resize(256).contrast(5);
		}));

// to set the max concurrency (defaults to the number of processors)
gm.setMaxConcurrency(2);

Before submitting pull requests, please update the tests and make sure they all pass.

$ npm test

Copyright © 2015–2017 Natural Atlas, Inc. & Contributors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.