TIFF is not officially supported now and so far we can only output 8bit JPEG in html canvas through downsampling.
The downsampling is process "the thinking" part is controlled to be not hurting the user experience and it's different depending on your machine. For faster machines we can remove the thinking part but it would take up more memory (right now the footprint during processing is less than 20mb, consider this is a web app)
I agree Adobe is doing better in interpolation (the harshness) and we are working to improve that.
What OS and browser you're using? The curves and split toning works well on Mac Desktops.
We only have two developers working on this right now. Do you know where we can get lens correction profiles, is it publicly licensed?
Clicking on the curve points doesn't do anything. I just retried it thinking maybe I had done something wrong, but still no love.
Re: correction profiles, I'm not sure. Darktable has some, though not as many as Lightroom, so there must be some public source for some of them. This is actually a pretty big deal (for me at least). I'm not a photographer, but I publish a digital/ipad magazine and do most of the retouching work.
(Not a fan of darktable, but they do some things pretty well).
Impressive, sure. But faster? Lightroom?
Like I said, impressive, but you'll catch a lot of flak for an otherwise impressive application by using the lightroom hyperbole. I don't think many people use lightroom to edit 8bit jpgs (changing exposure on a jpg is a bit disappointing!)
But I use Lightroom every day, and you might be faster but you aren't working at the same level of quality.
I loaded up a 16-bit TIFF and got an 8-bit JPEG as a result, which leads me to assume that you are downsampling to 8-bit to work.
Also, the results in polarr are way harsher then Lightroom, which is pretty common for non Adobe products. GIMP is especially harsh in contrast to Photoshop.
But even before getting into the color correcting stuff, you're already shifting color (I'm assuming you are ignoring the embedded color profile in the TIFF):
http://i.imgur.com/QKb42l5.png
Also, Lightroom is way faster making adjustments. I can see polarr "thinking" when I make adjustments (it gets pixellated and then clears up), while Lightroom does them in real time.
I couldn't get your curves to work.
No split toning.
Lens correction should be automatic and profile based. Lightroom will automatically fix distortions based on Camera and Lens model. Same with basic color calibration.
Again, I don't want to be discouraging, but I find the hyperbole kind of frustrating.