When using zoomSnap and zoomDelta, a seamline is present

[mejackreed]

Tracking upstream here: Leaflet/Leaflet#3575

The fix described in https://github.com/Leaflet/Leaflet.TileLayer.NoGap unfortunately does not work.

[mejackreed]

I've also noticed that some tile sources work as expected (no seam) while others present the seam:

No seam

https://dzkimgs.l.u-tokyo.ac.jp/iiifimgs/zuzoubu/12b02/0001-0025.tif/info.json

Seam

http://codh.rois.ac.jp/pmjt/iiif/200014778/200014778_00023.tif/info.json

[2SC1815J]

No seam
https://dzkimgs.l.u-tokyo.ac.jp/iiifimgs/zuzoubu/12b02/0001-0025.tif/info.json

It looks inconspicuous because it is the same color.
You can see some seam lines on the captured image.

And how about this info.json ? (the bottom of the list shown below)
https://dzkimgs.l.u-tokyo.ac.jp/iiifimgs/zuzoubu/02/0002.tif/info.json
http://rawgit.com/2SC1815J/19219fe9f54592df5e214074f5579ab5/raw/

[mejackreed]

Thanks for the comment. I see the seam in your video, but still cannot find it locally.

However, on https://dzkimgs.l.u-tokyo.ac.jp/iiifimgs/zuzoubu/02/0002.tif/info.json the seam is present for me.

[2SC1815J]

Here is a pure Leaflet 1.2.0 example (without Leaflet-IIIF) and you may see the seam on it.
http://leafletjs.com/examples/zoom-levels/example-delta.html


(These images are captured from the example on Firefox 56.0.1.)

So, it might be a problem of Leaflet itself, not of Leaflet-IIIF.
It seems that the Leaflet/Leaflet#3575 has not been fixed yet.

[IMMSPgisgroup]

I see same bug as in previous post on Firefox Quantum.

[IMMSPgisgroup]

I don't see this bug on Google Chrome or Microsoft Edge, only on Firefox.

[mejackreed]

I've created an example we can use to test: https://bl.ocks.org/mejackreed/bec44e64a18dfcb5bd89d691a2f86a55

[2SC1815J]

Thank you for creating a test bench.
The attached images are captured with Firefox 59.0.2 (top) and Google Chrome 65.0.3325.181 (bottom).


Unfortunately, with Chrome is less noticeable than with Firefox, but the seams are still visible.