Image resolution

[Lluís Garcia i Mestres]

Thanks Jacob,

It looks that I get the same quality of image. Therefor I was using
the same image size. With jpg format it seems correct the quality
level.

Lluís

On 4/19/05, Jacob Delfos <jacob.delfos at maunsell.com> wrote:
> Lluís,
>  
> If you are using PNG, it is possible you only get 256 colours. Put these
> statements in your mapfile (comment out your existing outputformat and
> imagetype, if any), and check whether it gets any better:
>  
> OUTPUTFORMAT
>   NAME jpeg
>   DRIVER "GD/JPEG"
>   MIMETYPE "image/jpeg"
>   IMAGEMODE RGB
>   EXTENSION "jpg"
>   FORMATOPTION "QUALITY=80" 
> END
>  
> IMAGETYPE jpeg
>  
> When I mentioned about changing the image size, I meant in your template. Do
> you have an "<image" statement around your [img] parameter, and if so, is
> the width of it the same as the mapimage in your mapfile?
>  
> Regards,
>  
> Jacob
>  
> JACOB DELFOS
> SPATIAL INFORMATION ANALYST
> Maunsell Australia Pty Ltd
> 629 Newcastle Street, WA 6007
> PO Box 81, WA 6902
> Leederville 
> Western Australia
> ABN 20 093 846 925
>  
> Tel     + 61 8 9281 6185
> Fax    + 61 8 9281 6297
> jacob.delfos at maunsell.com
>  
>  
>  
> -----Original Message-----
> From: Lluís Garcia i Mestres [mailto:lluisgm at gmail.com] 
> Sent: 19 April 2005 15:40
> To: Jacob Delfos
> Cc: MAPSERVER-USERS at lists.umn.edu
> Subject: Re: [UMN_MAPSERVER-USERS] Image resolution
>  
> I didn´t change the image size, it's the original from the tfw. My tif
> is a composition of 6 RGB and is displayed as a raster layer in the
> correct position. The resolution of the image and the map is the
> same:72 dpi.
>  
> The output format is png, and I think the problem should be there.
>  
> Lluís
>  
> 
> On 4/19/05, Jacob Delfos <jacob.delfos at maunsell.com> wrote:
> > Is your map-image being displayed at its normal resolution, or did you
> > specify a size for the image ( <img width=x height=x ) which does not
> match
> > your map-image size?
> > Or are you by any chance using GIF as an output format? Or another format
> > that is not rgb? Sometimes using indexed colour (8bit, 256 colours) can
> > create the illusion of reduced resolution, because pixels of similar
> colour
> > get merged.
> >  
> > Regards,
> >  
> > Jacob
> >  
> >  
> >  
> > -----Original Message-----
> > From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
> > Behalf Of Lluís Garcia i Mestres
> > Sent: 18 April 2005 22:04
> > To: MAPSERVER-USERS at LISTS.UMN.EDU
> > Subject: [UMN_MAPSERVER-USERS] Image resolution
> >  
> > Hi 
> >  
> > I'm working with a tif file of 0,5 meter per pixel. I don't know why,
> > when I check this tif out of mapserver the quality is greater than
> > when I display it in my mapserver application. I´ve try with different
> > resolution in the map file but the quality is still the same.
> >  
> > Thanks
> >  
> > Lluís
> >
>