Decoding TIFF very slow

[jonaskohl]

I'm using image-js to decode multipage TIFF images. However, the performance is really poor. I have a 32 page TIFF for example, which takes almost 2 minutes to decode in Chrome on a decent machine. I'm using Image.load(tiffBytes) to decode the image. Is there any chance I could speed up the decoding time as this is almost unbearable for the end user?

[jonaskohl]

Okay, this is probably because the uncompressed version of this TIFF is over 1 GiB

[lpatiny]

Did you try to load the uncompressed image ? I'm able to load uncompressed tiff of 1.5Gb in just couple of seconds.

In tiff the compression could be Zip or LZW. This can be checked using the command (from ImageMagick):

identify -format "%[compression]\n" *

You may open an issue with an image example in the project https://github.com/image-js/tiff. You may also open a PR if you see how to improve performances.

[jonaskohl]

Yes, I tried that and got similarly poor performance

I will open an issue there

[jonaskohl]

I created the issue in image-js/tiff#41

[jonaskohl]

I also noticed that Image.getRGBAData() is quite slow (~ 80ms per page for the image I'm using)