END OF AN ERA, FRACTALFORUMS.COM IS CONTINUED ON FRACTALFORUMS.ORG

Tile stitching error

So I am making a crazy project. I want to cover a wall with fractal
tiles to make a giant fractal poster.

Tiles made poster something like these.
http://www.laboratory424.com/project/panel-poster

So each tile I plan on printing on a A4 paper, and I using a very high
resolution to get a photo realistic look. The resolution is 6304x4464. And
the number of tiles in row and column is 8. So that results in 64
tiles.

Now the calculation goes okay, but the stitching of the picture in the end fails and gives an error.

Take a look at the end.

---------- Tile: 61 -------------
Average N = 17,502012, Average DE steps = 68,842074, Missed DE 0,000%       
Done 100,000%, to go = 0h0m0s, elapsed = 1h2m16s, iters/s = 29890253       
Rendering Screen Space Ambient Occlusion. Done 100%         
Image saved: /media/big_store/fraccz00061.tile
---------- Tile: 62 -------------
Average N = 18,068604, Average DE steps = 72,405728, Missed DE 0,002%       
Done 100,000%, to go = 0h0m0s, elapsed = 1h18m47s, iters/s = 30153702       
Rendering Screen Space Ambient Occlusion. Done 100%         
Image saved: /media/big_store/fraccz00062.tile
---------- Tile: 63 -------------
Average N = 18,402285, Average DE steps = 55,895546, Missed DE 0,065%       
Done 100,000%, to go = 0h0m0s, elapsed = 1h30m11s, iters/s = 29537657       
Rendering Screen Space Ambient Occlusion. Done 100%         
Image saved: /media/big_store/fraccz00063.tile
Compiling image from tiles, row 0
Compiling image from tiles, row 1
Compiling image from tiles, row 2
libpng error: Write Error
[write_png_file] Error during writing bytesRendering finished

The resulting corrupt file is 2GB is size, so I think we have hit some
kind of file or memory limit in the stiching process.

Any idea to how I fix this ? Anyone solved a similar problem?

Or is I the first that make fractals at this size?

I am using the ext3 file system. en.wikipedia.org/wiki/Ext3
and it doesn't seems to have a 4GB file size limit.

But the resulting png file is 2GB in size and I have 2GB of memory in my computer.

Does the stitching process load all the tiles into the memory?, because then we might have the problem there.

Anyway can I save the tiles as png files and turn off the stitching process?

Why 540 dpi? It won't be an improvement over 300 dpi so no reason to go to that resolution. Frankly, I can't see a difference between 200 dpi and 300 dpi (especially if you are going to print wallpapersize), except under a magnifying glass, but I'm sure there are people who'll tell you they can. At 200 dpi, your filesize will be a factor 7 lower. Might be worth a try

I guess, cause mandelbulber does it automatically - no way to get rid of.

I have modified the source code for mandelbulber so that it generate PNG tiles, very easy. Oh-ray for open source software.