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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | 60x 60x 60x 20x 40x 8x 32x 32x 32x | /**
* This function checks color space conversion data requirements before
* applying them. This function was created to solve problems like the one
* discussed in here https://discourse.orthanc-server.org/t/orthanc-convert-ybr-to-rgb-but-does-not-change-metadata/3533/17
* In this case, Orthanc server converts the pixel data from YBR to RGB, but maintain
* the photometricInterpretation dicom tag in YBR
* @param imageFrame
* @param RGBA
* @returns
*/
export default function isColorConversionRequired(imageFrame) {
Iif (imageFrame === undefined) {
return false;
}
const {
rows,
columns,
photometricInterpretation,
pixelDataLength,
planarConfiguration,
} = imageFrame;
// if it is rgba don't convert (typically jpeg, jpeg-xl, jpeg2000 etc)
if (pixelDataLength === 4 * columns * rows) {
// RGBA - JPEG
return false;
}
if (photometricInterpretation === 'PALETTE COLOR') {
return true;
}
Iif (photometricInterpretation.endsWith('420')) {
return (
pixelDataLength ===
(3 * Math.ceil(columns / 2) + Math.floor(columns / 2)) * rows
);
} else Iif (photometricInterpretation.endsWith('422')) {
return (
pixelDataLength ===
(3 * Math.ceil(columns / 2) + Math.floor(columns / 2)) *
Math.ceil(rows / 2) +
Math.floor(rows / 2) * columns
);
} else {
return photometricInterpretation !== 'RGB' || planarConfiguration === 1;
// and it is one of the rle and lei cases then we need to convert
}
}
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