Fabric Inspection
The four-point system grades penalty density, not defect count. A wide roll simply has more room to hide the same faults.
— points/100 yd²
The figure the roll is graded on
No single defect scores more than four points however long it is, and the usual convention caps penalties at four points per linear yard — neither cap is applied here, so a roll with a few very long faults will grade better on this arithmetic than under a strict application of the rule. Major defects that void the piece are handled outside the point system entirely.
Four-Point System Fabric Defect Index Calculator — free, with the formula and a worked example, at Textile School.