[OpenLayers-Dev] jpeg vs jpg

Paul Spencer pspencer at dmsolutions.ca
Thu Oct 25 09:11:19 EDT 2007

Ok, I take that back :)  I was looking at the PIL code and it takes  
the extension (jpeg) as a format option but I hadn't considered the  
case where you were not using PIL.  But in either case, I now realize  
the final image name is being created incorrectly regardless of  
whether PIL is used or not.


On 25-Oct-07, at 9:08 AM, Christopher Schmidt wrote:

> On Thu, Oct 25, 2007 at 08:57:02AM -0400, Paul Spencer wrote:
>> No.  TileCache saves the image with a .jpg extension but uses 'jpeg'
>> for the mime type of the returned content.  The underlying library,
>> PIL, will do that automagically for you.
> No.
> 1. PIL is not neccesarily involved in transactions. It is only used
>    with meta-tiling, so invoking the name of PIL here is irrelevant.
> 2. The last parts of the diskcache key are:
>      "%03d.%s" % (int(tile.y) % 1000, tile.layer.extension)
> 3. The Layer class converts the extension:
>      if extension.lower() == 'jpg': extension = 'jpeg' # MIME
>      self.extension = extension.lower()
> Jachym is right. The Layer.TileCache is wrong.
> Regards,
> -- 
> Christopher Schmidt
> MetaCarta

|Paul Spencer                          pspencer at dmsolutions.ca    |
|Chief Technology Officer                                         |
|DM Solutions Group Inc                http://www.dmsolutions.ca/ |

More information about the Dev mailing list