I made an experiment:
I made 5 versions of one photograph. Version 0 is a landscape without any alterations as an uncompressed -tiff format, about 69MB. Versions 1 - 4 I edited one pixel in every corner of the image, to see how editing affects to how it’s chunks are deduplicated.
Results:
Version 0: Among 139 chunks, found 0 (of course)
Version 1: Among 139 chunks, found 0
Version 2: Among 139 chunks, found 135
Version 3: Among 139 chunks, found 134
Version 4: Among 139 chunks, found 134
Uploading was superfast otherwise, but the last few chunks took a while in every version.
I may try other versions later, with different edits.
The original blank image you can download from here:
safe files download "Landscape_0.tif" fc4b349dd4dce1f07ed31724dda85c819206f3530ab805284204839397dda4bd