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mp_image: infer correct HLG sig_peak
For HLG, due to the usage of a reference OOTF configured for 1000 cd/m², the default sig_peak of =nom_peak was suboptimal. We can go down to 1000/100 (=10.0), since that's the true dynamic range of the output signal after it passes through the OOTF.
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@ -685,10 +685,15 @@ void mp_image_params_guess_csp(struct mp_image_params *params)
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params->color.gamma = MP_CSP_TRC_AUTO;
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}
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// If the signal peak is unknown, we're forced to pick the TRC's nominal
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// range as the signal peak to prevent clipping
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if (!params->color.sig_peak)
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params->color.sig_peak = mp_trc_nom_peak(params->color.gamma);
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if (!params->color.sig_peak) {
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if (params->color.gamma == MP_CSP_TRC_HLG) {
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params->color.sig_peak = 1000 / MP_REF_WHITE; // reference display
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} else {
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// If the signal peak is unknown, we're forced to pick the TRC's
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// nominal range as the signal peak to prevent clipping
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params->color.sig_peak = mp_trc_nom_peak(params->color.gamma);
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}
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}
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if (params->color.light == MP_CSP_LIGHT_AUTO) {
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// HLG is always scene-referred (using its own OOTF), everything else
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