This is a demo of tiff.js for decompressing and displaying a TIFF Group 4 image in a browser. The original image is 300dpi, and so cannot fit onto the screen. Therefore while the <canvas> is full-size, its style is set to 30%.
My thanks to Miles Elam (@mileselam) for explaining to me how to make a high resolution <canvas>.
I have written up more about this demo on Medium.