On 6/29/2020 7:45 PM, Reinhard Kotucha wrote:
96MiB per file. Processing means to apply a lookup table and a 3×3
color matrix, quite inexpensive operations. What takes most of the
time is to extract single bytes with string.sub() and to convert them
to integers. Finally I have to convert everything back to uint16.
last mail as it's way off topic ...
loading 96 MB string and converting 2 bytes to an unsigned: 1.7 sec
idem plus a lookup : 2.1 sec
idem but then also going back string with 2 byte unsigned : 5.0 sec
add a few sec for some calculations in between, so still doable in lua
(half that time when using luajit)
(measured on my 8 year old laptop so on a modern machine maybe less than
half the mentioned time which is okay compared to some pure c approach i
guess)
Hans
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