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[light] Fix gamma table dead zone collapsing to 0 (#18845)

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This commit is contained in:
Clyde Stubbs
2026-08-29 08:37:20 +10:00
committed by GitHub
parent 0dc0cf83de
commit c9848d8fa6
3 changed files with 112 additions and 3 deletions
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esphome/components/light/esp_color_correction.cpp
+5 -1
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@@ -5,7 +5,11 @@ namespace esphome::light {
uint8_t ESPColorCorrection::gamma_correct_(uint8_t value) const {
if (this->gamma_table_ == nullptr)
return value;
return static_cast<uint8_t>((progmem_read_uint16(&this->gamma_table_[value]) + 128) / 257);
uint16_t table_value = progmem_read_uint16(&this->gamma_table_[value]);
uint8_t result = (table_value + 128) / 257;
if (result == 0 && table_value != 0)
return 1;
return result;
}
uint8_t ESPColorCorrection::gamma_uncorrect_(uint8_t value) const {