mapimages have different hue (off-colour)

[Stephen Woodbridge]

Jacob,

Mapserver does not interact with any graphic board drivers. I does use
dll's for the graphics libraries and it is possible that these might
have been changed if you did a windows update or some such thing that
replaced the graphics libraries.

If this is happening solely on this system, then I would suggest that
you should re-install mapserver and its associated libraries. It is
possible that a library got damaged or replaced. I would also check that
you really are using the same mapfile on both systems, etc.

Beyond that, I'm not sure what else I would suggest.

-Steve

Jacob Delfos wrote:
> By the way, I'm using php_mapscript42.dll in chameleon 1.0.4. But I have
> run this config for a year, and I never had this problem. I'm
> running gdal 1.2.5.
>
>
> -----Original Message-----
> From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
> Behalf Of Jacob Delfos
> Sent: 25 January 2005 10:28
> To: MAPSERVER-USERS at LISTS.UMN.EDU <mailto:MAPSERVER-USERS at LISTS.UMN.EDU>
> Subject: Re: [UMN_MAPSERVER-USERS] mapimages have different hue (off-colour)
>
>
> Steve,
>
> I don't think this is related, because I'm not working in indexed colour.
> I did realise one thing I changed recently; I updated my graphics card
> drivers. I know that that SHOULD not have any effect on the physical
> image being generated, but.... it would explain why I saw this problem
> before with two machines where the only difference was that they had
> different hardware.
> Is there any connection between graphic card drivers and mapserver? As
> far as I know, the drivers shouldn't have anything to do with that. Just
> that I can't think of anything else.
>
> Tried viewing the mapimage in photoshop, but no difference. It seems
> like it uses a whole different library to compress to jpg. If I generate
> the same image from our production server, it creates a proper image.
> The good image is smaller in filesize than the bad image, but looks
> proper, and has a higher count of individual colours.
>
>
> Jacob
>
>
>
>
> -----Original Message-----
> From: Stephen Woodbridge [mailto:woodbri at swoodbridge.com]
> Sent: 24 January 2005 22:47
> To: Jacob Delfos
> Cc: MAPSERVER-USERS at LISTS.UMN.EDU <mailto:MAPSERVER-USERS at LISTS.UMN.EDU>
> Subject: Re: [UMN_MAPSERVER-USERS] mapimages have different hue (off-colour)
>
>
> What version of mapserver are you running?
> Have you looked at this bug?
> http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=306
> Have you tried viewing it on another system, or viewed it in another
> program like photoshop?
>
> -Steve W.
>
> Jacob Delfos wrote:
>  > Hi All,
>  >
>  > Got an interesting problem, which I hope someone recognises; My mapimage
>  > has changed hue in the last weeks. I am not sure what I changed to cause
>  > this. Perhaps an external program changed something about how my
>  > computer creates images. However, even if I restore the gdal12.dll file
>  > that I used previously (or any other of the many versions I have), my
>  > image is still off-colour. It is greenish/yellowish compared to the
>  > normal colour. It is still 24bit jpeg, though. But the mapimages from
>  > all php_mapscript based sites that I run from this machine have suddenly
>  > got this greenish tint.
>  >
>  > I suspect it may be something about the overal system, because I once
>  > noticed how different machines (a win2k desktop, and an XP laptop)
>  > generated slightly differently coloured mapimages (different hue,
>  > different saturation), even though both machines were installed with the
>  > exact same mapserver files. I tried running the site using a browser on
>  > the host and on a different machine, but both images look greenish.
>  >
>  > Does anyone know what could affect the hue of the mapimage? Something
>  > global?
>  >
>  > 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 <mailto:jacob.delfos at maunsell.com>
> <mailto:jacob.delfos at maunsell.com>