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Subject: P8 and exr

Anthanasius opened this issue on Oct 29, 2009 · 4 posts
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Anthanasius ( ) posted Thu, 29 October 2009 at 12:40 PM · edited Mon, 12 August 2024 at 11:16 AM

Can someone explain me why internaly P8 work with exr format ?

I look my PoserTextureCache folder while a render all the picture for texturing are about 900 Mb, it's enormous and slowly litterately process, loading texture, convert texture, using texture ... Why not using directly the proper format ?

V4 head texture is about 3 Mb, while render 65 Mb ... Something strange ...

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bagginsbill ( ) posted Thu, 29 October 2009 at 1:33 PM

V4 head texture is JPEG, not pixels. JPEG images are converted into the frequency domain and then the frequency data is compressed.

A 4K by 4K image is 65MB, uncompressed. This has nothing to do with EXR.

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stewer ( ) posted Thu, 29 October 2009 at 1:51 PM

OpenEXR supports tiled mip-maps - JPEG doesn't do that. Also, JPEG is a lossy format, where the EXR compression that Poser uses is lossless.

Tiled file formats allow a program to read just a section of it without having to read the entire file into memory. Poser leverages that feature in order to reduce the memory required when rendering: instead of having to read entire texture maps, the renderer can read only the sections it currently needs.

Anthanasius ( ) posted Thu, 29 October 2009 at 2:36 PM

Thx stewer, exactly what i want to know :-)

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