[Tilecache] Problems with PNG24 when metaTile=true

[Jeff Konnen]

Hi, 

I'm generating tiles using WMS - Services running on mapserver.


I want to use the metaTile=true option to get better results with
labelling, but I get this error: 

 File "/usr/bin/tilecache_seed.py", line
5, in ?
 pkg_resources.run_script('TileCache==2.10', 'tilecache_seed.py')

File
"/usr/lib/python2.4/site-packages/setuptools-0.6c7-py2.4.egg/pkg_resources.py",
line 448, in run_script
 self.require(requires)[0].run_script(script_name,
ns)
 File
"/usr/lib/python2.4/site-packages/setuptools-0.6c7-py2.4.egg/pkg_resources.py",
line 1166, in run_script
 execfile(script_filename, namespace, namespace)

File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/EGG-INFO/scripts/tilecache_seed.py",
line 9, in ?
 TileCache.Client.main()
 File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Client.py",
line 177, in main
 seed(svc, layer, map(int, args[1:3]), bboxlist ,
padding=options.padding, force = options.force, reverse = options.reverse)

File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Client.py",
line 132, in seed
 svc.renderTile(tile,force=force)
 File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Service.py",
line 138, in renderTile
 data = layer.render(tile, force=force)
 File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Layer.py",
line 435, in render
 image = self.renderMetaTile(metatile, tile)
 File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Layer.py",
line 407, in renderMetaTile
 subimage = image.crop((minx, miny, maxx,
maxy))
 File "/usr/lib64/python2.4/site-packages/PIL/Image.py", line 673,
in crop
 self.load()
 File
"/usr/lib64/python2.4/site-packages/PIL/ImageFile.py", line 155, in load

self.load_prepare()
 File
"/usr/lib64/python2.4/site-packages/PIL/PngImagePlugin.py", line 337, in
load_prepare
 raise IOError("cannot read interlaced PNG files")
IOError:
cannot read interlaced PNG files 

although my outputformat is defined as
follows: 

 OUTPUTFORMAT
 NAME "pnga"
 MIMETYPE "image/pnga"
 DRIVER
"AGG/PNG"
 EXTENSION "png"
 IMAGEMODE "RGBA"
 TRANSPARENT TRUE

FORMATOPTION "INTERLACE=OFF"
 END 

Any ideas? 

When trying metatiles on
JPEGs I get this error: 

Traceback (most recent call last):
 File
"/usr/bin/tilecache_seed.py", line 5, in ?

pkg_resources.run_script('TileCache==2.10', 'tilecache_seed.py')
 File
"/usr/lib/python2.4/site-packages/setuptools-0.6c7-py2.4.egg/pkg_resources.py",
line 448, in run_script
 self.require(requires)[0].run_script(script_name,
ns)
 File
"/usr/lib/python2.4/site-packages/setuptools-0.6c7-py2.4.egg/pkg_resources.py",
line 1166, in run_script
 execfile(script_filename, namespace, namespace)

File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/EGG-INFO/scripts/tilecache_seed.py",
line 9, in ?
 TileCache.Client.main()
 File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Client.py",
line 177, in main
 seed(svc, layer, map(int, args[1:3]), bboxlist ,
padding=options.padding, force = options.force, reverse = options.reverse)

File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Client.py",
line 132, in seed
 svc.renderTile(tile,force=force)
 File
"/usr/lib/python2.4/site-packages/TileCache-2.10-py2.4.egg/TileCache/Service.py",
line 140, in renderTile
 else: raise Exception("Zero length data returned
from layer.")
Exception: Zero length data returned from layer. 

Is there a
problem with my PIL library ? 

Kind regards, 

Jeff
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