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+# Soft-mask and pattern rendering-intent probes
+
+This self-authored 4-page PDF contains 108 declared pixel probes. The existing
+984-byte distinct CMYK/Lab ICC profile is copied without alteration. Its four
+intent outputs for CMYK (0, .75, .25, 0) have separated luminances; no PDF renderer
+supplies the expected colors.
+
+[Adobe PDF Reference 1.4](https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/pdfreference1.4.pdf)
+pp. 218, 223, 231 and 453 define pattern state. Colored tiling and shading patterns
+start with their resource-owning page/Form stream's initial state. A Form is
+reused under different initial intents, then changes its painting intent to
+Absolute. Explicit pattern overrides and q/Q are separate controls. Uncolored
+stencils contain no color operators or `ri`; their ICC base color is supplied by
+the caller. Small/large uncolored strokes distinguish stroke from fill color.
+
+Pages 440–446 define luminosity soft masks and their backdrop. The mask's RGB
+group contains one opaque ICC rectangle, or no objects for the BC-only controls.
+The direct CMM RGB result is reduced with the recommended .30/.59/.11 weights;
+black over white has value 255 minus that luminosity. This device-dependent
+formula is a declared test convention, not universal device calibration.
+
+Run `tests/cmyk_lut/transparency.py --self-check --output NEW_DIRECTORY`, or pass
+`--build-dir build --pdfium-library PATH/libpdfium.so --output NEW_DIRECTORY`.
+The runner records all failures, validates the sandbox helper and library hash,
+and judges PDFium and Poppler separately against the direct CMM. LittleCMS may
+be shared with the renderers; this is not an independent CMM implementation or
+general ICC conformance acceptance. The older 8-page intent fixture is unchanged.