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@@ -117,6 +117,12 @@ the verified value for the run above, not a universal surface format. The
converter uses the installed `System.Drawing` PNG encoder and adds no package
dependency.
+PNG exports treat the captured frame as opaque and preserve its stored RGB.
+Framebuffer alpha is a rendering result, not image transparency; applying it
+again when displaying the PNG would darken surfaces a second time. Raw files
+retain all four original channels. The comparison script also ignores alpha
+in older PNG exports, without changing the measured RGB values.
+
## Сравнение областей кадра
`compare-frames.ps1` собирает пару «оригинал / FParkan» без масштабирования и