ID 243388 - Paint Through Tool - Pixellation differs between paint and stamp method

Problem summary
The paint through tool, provides varying results when using the 'paint' method and the 'stamp' method. The paint method has a loss in quality when compared to stamping.

Customer reported version
3.1v3

Customer reported platform
centos6

Steps to reproduce
1) Start a new project with the attached sphere.obj
2) Create a scalar channel with 4096x4096 and 8bit
3) Paint buffer settings: 16bit 2048x2048 (happens with 4096x4096 too). Reset paint buffer.
4) Load and drop in attached example texture to use with Paint Through tool. Reset transforms relative to Paint Buffer.
5) Press 'Stamp' button
6) Move the image somewhere else and then paint the same detail next to it to compare.

Workaround
No known workaround

Reproduced by support
Repro'd by support in 3.1v3, 3.0v3 on Windows 7
Working in 3.0v1

Expected behaviour
Pixels to be the same

Actual behaviour
Varying results in pixels, see images:

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