[wikireader] Images on the WR not so imposible :P [was [wikireader]Error on parsing the spanish wikipedia]
David Garabana Barro
david at garabana.com
Tue Nov 3 12:53:53 CET 2009
On Tuesday 03 November 2009 12:15:11 David Reyes Samblas Martinez wrote:
> Regarding compression, I believe lzma is already builded in the
> wikireader application and it compress the images a 50%. enough for
> start I guess. but I have to recongnize than the image on png looks
> really good do maybe it worth the meaning to implemente it on the
> device if it's not much resource hungr
Both png and pbm are 1 bit images without lossy compression.
You can obtain exactly the same final image quality on both formats, but png
will have smaller disk size.
Final result only depends on RGB->1 bit indexed conversion method used.
AFAIK png decompression is not resource hungry. Compression *IS*.
PS For minimal png archive size, you *MUST* convert image to 1 bit indexed
palette before saving it.
If you use "greyscale", RBG or more than 1 bit palette, png will waste space
saving palette or RBG/greyscale info.
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