[kismac] Re: map question
- From: ard.jonker@xxxxxxxxx
- To: Doug Tallacksen <dougtallacksen2@xxxxxxxxxxx>
- Date: Tue, 2 Sep 2003 21:50:55 +0200
>2) Ard, you mentioned you have a useable map that can do 9x zooming.
>Wow! Can you give details on the size, resolution, etc?
I happened to have a large, single sheet map available that covered
the whole city in about 4 A4-sized submaps. Using an image
maniputlation program, I moved the four parts about till they were a
nice stitch without too much visible seam. As the map was detailed,
the images were scanned at 300 dpi, and A4 is roughly 11x8 inches, I
had 22x16 inch x300 dpi, so roughly 6kx5K. Clipping the odd harbour
sites that were of no interest, I was left with about 5K pixel
square.
When running Kismac, I guess the average map size visible in my
personal user environment is about 500x500 pix so that allows 10x
zooming. Give or take a factor 2 here or there. Nothing fancy I
guess. The whole map was some 100 MB during scanning and stitchnig
(uncompressed TIFF) but once I cut back to usefull size, reduced to
indexed 16 colors, applied lzw compression, I was down to 3 MB and
was left with a spotty map with flakey colors.
The best appearance, then, was when I changed the size of the
original stitch to jpg compression (recursive error correction 5x)
with a resolution of 3Kx3K at 72 dpi, yielding about 12 MB as map
size in Kismac.
Ard
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