pixel[2] = pixel[2] 0.04045f ? powf((pixel[2] + 0.055f) / 1.055f, 2.4f) : pixel[2] / 12.92f;
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Grammarly provides 24/7 support via submitting a ticket and sending emails. ProWritingAid’s support team is available via email, though the response time is approximately 48 hours.
Pulse-Code Modulation (PCM) — MDN Web Docs
paper: “watercolor paper texture”