Affinity Photo has full support for 32-bit float editing, including import/export for OpenEXR and Radiance formats. Compared to 8-bit or 16-bit, 32-bit presents an unbounded colour space that can contain a vast amount of tonal information. This means the information can be modified to extremes without losing fidelity or accuracy. For example, highlight detail blown out by an adjustment or filter can be recovered even after successive operations.
Support is included for HDR (High Dynamic Range) or EDR (Extended Dynamic Range) compliant displays, enabling a much higher peak brightness to be dispayed on-screen. See the 32-bit Preview panel topic for more information.
Uses for 32-bit HDR
Popular uses for 32-bit editing include:
HDR merging from several exposures to produce an image with greatly increased dynamic range. The result typically has to be tone mapped in order to be viewed properly on most displays.
3D render editing. Full renders and buffer passes from 3D software and 3D engines can be professionally colour managed and edited losslessly.
General image editing and design work with increased precision. Useful for fine gradient work, heavy tonal manipulations and composite work.
Viewing and editing high dynamic range imagery in conjunction with an HDR or EDR compliant display.