[mapguide-users] RE: Producing High Resolution images using renderingservice

[Bruno Scott]

I've already tried to produce huge image, my goal was to produce a A0 plot at
300 dpi
and i've found the theoric limitation :
root/branches/1.2.x/MgDev/Server/src/Services/Rendering/ServerRenderingService.cpp
...
static const INT32 MAX_PIXELS = 16384*16384;
...
    // sanity check - number of image pixels cannot exceed MAX_PIXELS 
     if (drawWidth * drawHeight > MAX_PIXELS) 
         throw new
MgOutOfRangeException(L"MgServerRenderingService.RenderMap", __LINE__,
__WFILE__, NULL, L"MgInvalidImageSizeTooBig", NULL); 


This is a quite big value enough to hold my needs.

But my server spent a long time calculating the resulting image
I was on my own computer with only myself asking to render an image
I can imagine you should setup your server with a huge amount of ram if
you want to handle many concurent sessions...


Bruno





Traian Stanev wrote:
> 
> Hi,
>  
> Both ways are possible. You can specify a higher dpi and also a really
> large output image size using the web APIs. I have tried both, and there
> was a bug with labels not taking into account dpi which I think I fixed
> (but my memory is fuzzy, so may be I didn't fix it). 
>  
> The limitation is the size of the ouput image in memory, since it needs to
> be in RAM while rendering the map. I successfully tried a 5000x5000 image,
> but with 10000x10000 it failed. For an 8.5"x11" image at 600 dpi, you
> would need to generate a 5100x6600 image which seems doable.
>  
> You can also stitch several large image tiles into one big raster as a
> post processing step, but this would most likely show labeling artifacts
> at the edges, so I would recommend the monolithic image approach.
>  
> Traian
>  
>  
> -----Original Message----- 
> From: mapguide-users-bounces at lists.osgeo.org on behalf of Simon Hope 
> Sent: Thu 6/21/2007 8:51 PM 
> To: mapguide-users at lists.osgeo.org 
> Cc: 
> Subject: [mapguide-users] Producing High Resolution images using
> renderingservice
> 
> 
> 
> 	Hi
> 
> 	 
> 
> 	I’ve got a client who is very interested in developing a site using
> MapGuide Open source and they have a requirement to produce a map image
> output into a PDF but the quality of the image is important - i.e.
> suitable to print on a 600dpi printer.
> 
> 	 
> 
> 	I’ve looked over the documentation and the Rendering Service seems to
> cater for map image output however it’s not clear on what quality you can
> get using this – does anyone have any experience of using the rendering
> service in this way and could answer these questions:
> 
> 	 
> 
> 	Can the rendering service be used to output map images at a higher
> quality by specifying resolution?
> 
> 	If the map image resolution cannot be set –is there any restriction on
> the size of the image exported using the rendering service (i.e. produce a
> large image (width x height) and reduce this to fit into the PDF –
> therefore increasing the quality?
> 
> 	 
> 
> 	Thanks
> 
> 	 
> 
> 	Simon
> 
> 
> _______________________________________________
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> mapguide-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapguide-users
> 
> 

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