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Recommended HDR pipeline using OpenExr to ASTC?

Hi, We're currently looking to switch to ASTC, though I do have some queries regarding the graphics pipeline for HDR formats.

Since we're looking to retain image quality as much as possible, can we use an Exr format for rendering (We currently use this for creating out lightmaps), and convert them directly to ASTC for our build?

It just when I've loaded exr files in to Mali it appears to compromise the image data (Darkening down), I presume it's clamping the channels?  

Is there a recommended pipeline for converting HDR images to ASTC that won't compromise the data?

Cheers,

Caroline

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