png.tile -> jpg.tile

[Osmandtrier]

Many tileservers are working with png-tiles. To save place on my SD-Card I want to convert the tiles to jpg.

I have tried irfanview. There are two problems.

1. The quality of the jpg-tles is poor instead the settings for the convertingquality is 100.

2. Irfanview add the extension jpg. I have to cut all this added extensions. Because I have so many tiles, Ant Renamer freeze.

Do anyone know a other solution?

[Sabra Sharaya]

These computer generated tiles seem to have a lot of redundancy though. Are you certain the jpg files use less space than the png?

[Horst Müller]

Hello there,

I did something similar (want to change the .tile extension to a .jpg extension, so that I can view the "small photos" directly). I used a batch-file. For you, the command might be something like:

for /r J:\osmand\tiles\ %%i in (*.jpg) do @echo ren "%%i" "%%~ni"
pause

the command "@echo" makes sure, that nothing is changed for now. It just shows you, what it would do, if you use the command without "@echo". So it's a safe run. If it does what you want, just delete this parameter and the real action goes on.

Still: I doubt you can save that much space. I believe companies already do use highly compressed files in order to reduce the necessary bandwidth.

Regards,

Horst

2013/5/22 Sabra Sharaya <sabras...@gmail.com>

These computer generated tiles seem to have a lot of redundancy though. Are you certain the jpg files use less space than the png?

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