file types

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Offline Adam Majewski

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« on: September 15, 2017, 09:45:13 PM »
Hi,

I have found in the code file type: kfc and kfd files.
What is the purpose of these files?

TIA

https://en.wikibooks.org/wiki/Fractals/kallesfraktaler#files

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Online claude

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« Reply #1 on: September 19, 2017, 11:21:30 PM »
They are strings found inside .kfb files (the first 3 bytes) to distinguish different versions of the data format stored in the file.

"KFB" is bNewFormat 0, vertical lines of int32 iteration plane followed by float32 smooth colouring plane.
"KFC" is bNewFormat 1, vertical lines of float32 combined data (int32 iteration + float32 smooth)
"KFD" is bNewFormat 2, horizontal lines of float32 combined data (int32 iteration + float32 smooth)

As far as I can tell, only "KFB" is actually saved by current versions of Kalles Fraktaler.

"KFB" is also the only format that preserves smooth colouring at high iteration counts, because single precision float32 can only represent integers after 2^24 = 16M, can only represent even integers after 2^25 = 33M, etc, with gradual degradation before that.


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