"Warp" <war### [at] tagpovrayorg> wrote in message
news:3c968149@news.povray.org...
> Thorsten Froehlich <tho### [at] trfde> wrote:
> > BTW, such a 1 bit GIF is about 11 KB and a 24 bit PNG about 78 KB, so it
could
> > really work!
>
>   I just tried to compress a 4096x4096 image to PNG with pngcrush (using
its
> brute force search for the best compression settings).
>   At 24 bits per pixel the image file is 58540 bytes long, and at 8 bits
> per pixel it's 2131 bytes long.
>
>   (I really wonder why the 24-bit image is so big. Why not three times the
> size of the 8-bit version?)

I'm just guessing but I would suppose that at 8-bit there are larger blocks
of the same color than at 24 bit and larger blocks are easier to compress?
Correct me if I wrong I'm just taking an educated stab here.

Corey

> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -

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