deepzoom_tile.py slowness

[Mathieu Malaterre]

On Thu, Jul 19, 2012 at 12:03 AM, Benjamin Gilbert <bgilbert at cs.cmu.edu> wrote:
> On 07/18/2012 08:17 AM, Mathieu Malaterre wrote:
>>    I am trying to use deepzoom_tile.py on some TIFF files [1]. The
>> application has been running for quite some time (>1 hour) without
>> producing any output so far. Does anyone know what type of preprocess
>> I should run on those TIFF files to make them more efficient with
>> openslide ?
>
> deepzoom_tile.py assumes it is working with multi-resolution (pyramidal)
> images.  To convert your TIFF to a pyramidal image, you can use
> ImageMagick >= 6.7.3-8:
>
>    convert input.tiff -compress jpeg -quality 90 \
>      -define tiff:tile-geometry=256x256 ptif:output.tiff
>
> Or VIPS >= 7.28:
>
>    vips tiffsave input.tiff output.tiff --compression=jpeg --Q=90 \
>      --tile --tile-width=256 --tile-height=256 --pyramid
>

Indeed there is a huge difference.

Thanks much !
-- 
Mathieu