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Microns per pixel (MPP) describes the physical size represented by one base-level image pixel. Strand uses this scale when normalizing slide pixels for inference. An incorrect value can change the biological scale of the image regions sent to the model. Set an override on the sample after uploading its whole-slide image and before submitting a prediction when the embedded scale is missing or known to be wrong. The user-reported value takes precedence over embedded slide metadata for subsequent jobs on that sample.

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Isotropic pixels

Use one value when the horizontal and vertical scales are the same:
The value must be greater than 0 and at most 100 microns per pixel. The response echoes the persisted mpp value. Each Strand sample uses one isotropic scale, so a single value governs both axes. The REST endpoint also accepts an { "x", "y" } object when both axes are equal; an object with differing axes is rejected.