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write16bitTiff.js
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write16bitTiff.js
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var write16bitTiff = function (floatArray, width, height) {
var imageDataLength = width * height * 2;
var buffer = new Uint8Array(imageDataLength + 1000);
var o = 0;
// tiff header
buffer[o] = 0x4d; o++;
buffer[o] = 0x4d; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x2a; o++;
var firstIfdOffset = imageDataLength + 8;
buffer[o] = (firstIfdOffset & 0xff000000) / 16777216; o++;
buffer[o] = (firstIfdOffset & 0x00ff0000) / 65536; o++;
buffer[o] = (firstIfdOffset & 0x0000ff00) / 256; o++;
buffer[o] = (firstIfdOffset & 0x000000ff); o++;
for (var p = 0; p < width * height; p++) {
var intValue = Math.floor(floatArray[p] * 65535);
buffer[o] = (intValue & 0xff00) / 256; o++;
buffer[o] = (intValue & 0x00ff); o++;
}
// footer, 13 directory entries
buffer[o] = 0x00; o++;
buffer[o] = 0x0d; o++;
// width tag
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = (width & 0xff00) / 256; o++;
buffer[o] = (width & 0x00ff); o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// height tag
buffer[o] = 0x01; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = (height & 0xff00) / 256; o++;
buffer[o] = (height & 0x00ff); o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// bits per sample tag
buffer[o] = 0x01; o++;
buffer[o] = 0x02; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x10; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// compression flag
buffer[o] = 0x01; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// photometric interpretation tag
buffer[o] = 0x01; o++;
buffer[o] = 0x06; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++; // 1 = greyscale 2 = rgb
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// strip offset tag
buffer[o] = 0x01; o++;
buffer[o] = 0x11; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x04; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x08; o++;
// orientation flag
buffer[o] = 0x01; o++;
buffer[o] = 0x12; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// sample per pixel tag
buffer[o] = 0x01; o++;
buffer[o] = 0x15; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++; // number of channels
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// rows per strip tag
buffer[o] = 0x01; o++;
buffer[o] = 0x16; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = (height & 0xff00) / 256; o++;
buffer[o] = (height & 0x00ff); o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// strip byte count tag
buffer[o] = 0x01; o++;
buffer[o] = 0x17; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x04; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
var byteCount = imageDataLength;
buffer[o] = (byteCount & 0xff000000) / 16777216; o++;
buffer[o] = (byteCount & 0x00ff0000) / 65536; o++;
buffer[o] = (byteCount & 0x0000ff00) / 256; o++;
buffer[o] = (byteCount & 0x000000ff); o++;
// minimum sample value tag
buffer[o] = 0x01; o++;
buffer[o] = 0x18; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// maximum sample value tag
buffer[o] = 0x01; o++;
buffer[o] = 0x19; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0xff; o++;
buffer[o] = 0xff; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// sample format tag
buffer[o] = 0x01; o++;
buffer[o] = 0x53; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x03; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x01; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
// end of the directory entry
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
buffer[o] = 0x00; o++;
console.log(o);
return buffer;
};
var testImage = new Float32Array([1.0, 0.5, 0.25, 0.0]);
function uint8ToBase64(u8Arr){
var CHUNK_SIZE = 0x8000; //arbitrary number
var index = 0;
var length = u8Arr.length;
var result = '';
var slice;
while (index < length) {
slice = u8Arr.subarray(index, Math.min(index + CHUNK_SIZE, length));
result += String.fromCharCode.apply(null, slice);
index += CHUNK_SIZE;
}
return btoa(result);
}
function saveContent(fileContents, fileName) {
var link = document.createElement('a');
link.download = fileName;
link.href = 'data:application/stream;base64,' + fileContents;
link.click();
}
//var data = write16bitTiff(testImage, 2, 2);
//
//console.log(data);
//
//window.open('data:application/stream;base64,' + uint8ToBase64(data));