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As I understand it normal maps are only of use for close up portrait work?
There can be susbstantial variations in normal map filesizes, however.
It seems that 4096x4096 in TIFF format is pretty well standard, but from then on things start to get a bit weird.
Whilst some have a filesize around 2 MB others can be as much as 48 MB & some well over 100 MB.
Why the extreme variation in filesize?
Is a large file necesarily any better than a small one?
If not what is the easiest way of shrinking the filesize, please?I have similar question and then experimenting myself about the quality.As Far as I know, the choice of file size and compression by Vendor is all about preserving their quality but there some case when Vendor don't bother to clean up their 'Pre-production' mess (as in layers,colors adjustment,etc), which in turn, bloat the files like crazy when they save it to other format.
Like you said,normal maps or bump maps in general is used to 'trick' the detail in closeup potrait especially in 4K Ultra HD shot, I don't think I met a difference in quality after I re-compress it to smaller quality with Photoshop when I render it to just 1080p or 720p.
For shrinking, of course,i think using photoshop is easier, i usually shrink the jpg size by half by saving them with 7-8 quality, for PNG, i find saving for web purpose will do fine in decreasing the file size and still preserving its quality. TIFF file is more 'persistent 'and tricky to shrink it size, sometimes the vendor already compress it as small as possible with tiff format,but they still have those 40+ MB.I suppose ideally, what I would like to be able to do is replace the humunguous normal files with smaller ones, but I suppose then I am going to get to grips with editing duf files to get them to load.
Surely a .jpg based modest normal file isn't going to lose much over a humunguous tiff in your average portrait render?
:0/
I am not a big fan of jpg because of the compression/artefacts. Just tested a 554 MB tiff and saved as PNG with a lossless result of 36 MB. Guess it's the best quality/size ratio.
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