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[bug] white strides on an IIIF image
Describe the bug The following image does not appear correctly in dezoomify: https://gallica.bnf.fr/iiif/ark:/12148/bpt6k1510474b/f7/info.json
There are white strides on the right of the image
Screenshots

The gallica IIIF implementation returns tiles of the wrong size:
according to the specification, the following tile should be 215x512 but it is 215x510 :
https://gallica.bnf.fr/iiif/ark:/12148/bpt6k1510474b/f7/1536,0,215,512/215,/0/default.jpg
