cornerstone-wado-image-loader
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Cornerstone Image Loader for DICOM WADO-URI and WADO-RS
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<h2><a href="index.html">Home</a></h2><h3>Global</h3><ul><li><a href="global.html#addTask">addTask</a></li><li><a href="global.html#arrayBufferToString">arrayBufferToString</a></li><li><a href="global.html#cacheSizeInBytes">cacheSizeInBytes</a></li><li><a href="global.html#cancelTask">cancelTask</a></li><li><a href="global.html#decodeAsync">decodeAsync</a></li><li><a href="global.html#framesAreFragmented">framesAreFragmented</a></li><li><a href="global.html#getMinMax">getMinMax</a></li><li><a href="global.html#getNumberString">getNumberString</a></li><li><a href="global.html#getNumberValues">getNumberValues</a></li><li><a href="global.html#getStatistics">getStatistics</a></li><li><a href="global.html#getTransferSyntaxForContentType">getTransferSyntaxForContentType</a></li><li><a href="global.html#getUncompressedImageFrame">getUncompressedImageFrame</a></li><li><a href="global.html#getValue">getValue</a></li><li><a href="global.html#handleMessageFromWorker">handleMessageFromWorker</a></li><li><a href="global.html#handler">handler</a></li><li><a href="global.html#initialize">initialize</a></li><li><a href="global.html#loadCodecs">loadCodecs</a></li><li><a href="global.html#loadWebWorkerTask">loadWebWorkerTask</a></li><li><a href="global.html#registerLoaders">registerLoaders</a></li><li><a href="global.html#registerTaskHandler">registerTaskHandler</a></li><li><a href="global.html#setPixelDataType">setPixelDataType</a></li><li><a href="global.html#setTaskPriority">setTaskPriority</a></li><li><a href="global.html#spawnWebWorker">spawnWebWorker</a></li><li><a href="global.html#startTaskOnWebWorker">startTaskOnWebWorker</a></li><li><a href="global.html#terminate">terminate</a></li><li><a href="global.html#unpackBinaryFrame">unpackBinaryFrame</a></li></ul>
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<h1 class="page-title">imageLoader/colorSpaceConverters/convertPALETTECOLOR.js</h1>
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<pre class="prettyprint source linenums"><code>/* eslint no-bitwise: 0 */
function convertLUTto8Bit(lut, shift) {
const numEntries = lut.length;
const cleanedLUT = new Uint8ClampedArray(numEntries);
for (let i = 0; i < numEntries; ++i) {
cleanedLUT[i] = lut[i] >> shift;
}
return cleanedLUT;
}
/**
* Convert pixel data with PALETTE COLOR Photometric Interpretation to RGBA
*
* @param {ImageFrame} imageFrame
* @param {Uint8ClampedArray} rgbaBuffer
* @returns {void}
*/
export default function (imageFrame, rgbaBuffer) {
const numPixels = imageFrame.columns * imageFrame.rows;
const pixelData = imageFrame.pixelData;
const rData = imageFrame.redPaletteColorLookupTableData;
const gData = imageFrame.greenPaletteColorLookupTableData;
const bData = imageFrame.bluePaletteColorLookupTableData;
const len = imageFrame.redPaletteColorLookupTableData.length;
let palIndex = 0;
let rgbaIndex = 0;
const start = imageFrame.redPaletteColorLookupTableDescriptor[1];
const shift =
imageFrame.redPaletteColorLookupTableDescriptor[2] === 8 ? 0 : 8;
const rDataCleaned = convertLUTto8Bit(rData, shift);
const gDataCleaned = convertLUTto8Bit(gData, shift);
const bDataCleaned = convertLUTto8Bit(bData, shift);
for (let i = 0; i < numPixels; ++i) {
let value = pixelData[palIndex++];
if (value < start) {
value = 0;
} else if (value > start + len - 1) {
value = len - 1;
} else {
value -= start;
}
rgbaBuffer[rgbaIndex++] = rDataCleaned[value];
rgbaBuffer[rgbaIndex++] = gDataCleaned[value];
rgbaBuffer[rgbaIndex++] = bDataCleaned[value];
rgbaBuffer[rgbaIndex++] = 255;
}
}
</code></pre>
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