Jonathan, there's no "conjbug". See my long message in the other forum. In researching this I noticed that the Xfractint function: void FPUcplxlog_CMPLX *x, _CMPLX *z) { double mod,zx,zy; mod = sqrt(x->x*x->x + x->y*x->y); zx = log(mod); zy = atan2(x->y,x->x); z->x = zx; z->y = zy; } could be speeded up by getting rid of the sqrt() at the cost of a multiply: void FPUcplxlog_CMPLX *x, _CMPLX *z) { double zx,zy; zx = .5*log(x->x*x->x + x->y*x->y); zy = atan2(x->y,x->x); z->x = zx; z->y = zy; } There's no downside that I can see, the two are mathematically equivalent, and the faster version is just as readable. I didn't benchmark the different but I'll bet it's measurable. Tim
I hope that everyone here knows what happens on June 20, 2003. That's when US patent 4,558,302 expires. (That is the patent that Unisys has on the LZW compression algorithm that is used in gifs.) That doesn't necessarily mean that we give up on implementing PNG in Fractint, but it does lower the priority, I guess.
Lee wrote:
I hope that everyone here knows what happens on June 20, 2003.
That's when US patent 4,558,302 expires. (That is the patent that Unisys has on the LZW compression algorithm that is used in gifs.)
The expiration of this patent has no effect on Fractint at all. We didn't implement PNG because of memory limitations involving the medium model and Fractint's large size. PNG is a superior format to GIF in almost every respect. For one thing, PNG supports true color and GIF does not. That's just the beginning. Howver, for 256 color images, GIF has been just fine. The DOS fractint will always keep GIF. On other platforms we can support PNG, and maybe also GIF if anyone cares. I know you care for backwards compatability. Tim
The expiration of this patent has no effect on Fractint at all. We didn't implement PNG because of memory limitations involving the medium model and Fractint's large size. <<
Yes, but once there was a fear of user fees that Unisys might invoke to anyone who generated gifs. Now, that will no longer be possible.
PNG is a superior format to GIF in almost every respect. For one thing, PNG supports true color and GIF does not. That's just the beginning. <<
I agree.
Howver, for 256 color images, GIF has been just fine. The DOS fractint will always keep GIF. On other platforms we can support PNG, and maybe also GIF if anyone cares. I know you care for backwards compatability. <<
Yes, I have over 70 full archived CDs of Fractint Gifs that I've I've generated over the years (over 50,000 images) that I would like to be able to input to any future platforms. Lee
participants (2)
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Lee H. Skinner -
Tim Wegner