Saving HDR files is poorly implemented and ambiguous.
The first issue is the "HDR Options" tab in Preferences, which lets you choose either "LogLuv TIFF" or "Float TIFF". This is poorly named, since it implies that LogLuv is not "Float", but the part in brackets says it is, while Wikipedia says LogLuv is NOT floating-point but fixed!
Let's for a moment assume you should keep this tab, so to fix it you should find out what each option really is, and write the correct label, and put the explanation in a tooltip:
• LogLuv TIFF (float, 16bit per color channel)
• Float TIFF (float, 32bit per color channel)
• LogLuv TIFF
tooltip: describe what it actually is, e.g. Fixed-point, L 16-bit + U 8-bit + V 8-bit, 32-bit per pixel.
• Float TIFF
tooltip: Double-precision (or single? I don't know) floating-point, 32-bit per color channel, 96-bit per pixel.
Secondly, this tab doesn't actually work. Select LogLuv as your default format, but when you save the HDR as TIFF it still defaults to 32-bit Float.
Thirdly, even if you do that, this is still not optimal. What you should do is to remove that whole tab, and instead just make the Save As window allow one to choose what they want, which is the most intuitive and easy to use way. So I would click Save-As, and then I should be able to choose:
• OpenEXR (.exr)
• Radiance RGBE (.hdr)
• LogLuv TIFF (.tif)
• Float TIFF (.tif)
• PFS Stream (*.pfs)
When a user selects one of these options, the extension of the filename should get automatically corrected, e.g. if I type "foo.tif" and then I select EXR, the filename should automatically change to "foo.exr".
Saving HDR files is one of the most basic things a HDR program does, so please give this issue attention so it does that correctly.
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