Enable gain map exports from Photoshop

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Gain map support in LR / ACR is great, and it would be helpful to extend it to Photoshop as well.

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Enabling gain map exports from Photoshop allows images to retain enhanced HDR brightness and color information while remaining compatible with SDR displays. This improves visual quality across devices, making photos appear more vibrant, detailed, and consistent in both modern and traditional viewing environments.

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Exporting AVIF and JPEG XL with gain map is currently an experimental feature (not fully tested or tuned). Therefore, it is not enabled by default. However, you may access this feature by holding the Shift key while clicking on the Save button in Camera Raw. (Be sure to press Shift before clicking the Save button.) Then the Save dialog will have a new checkbox in the Color Space section called "Embed HDR Gain Map."

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