[mapserver-users] Raster Aerial photos

[Paul Ramsey]

My guess is that your photos use different 256 color palettes. As you add 
more and more of them, mapserver has to choose which colors from the photos 
to include in its final 256 color palette. Mapserver's choices when 
downsampling colors are not notably good.  The short term hack is to try and 
recreate all your photoes with exactly the same palette.  The longer term one 
is to wait for Frank to finish his 24-bit retrofit, which should kill all 
these problems once-and-for-all (hoorah!!).

P.

On Monday 10 June 2002 07:54 am, Iris Schnegg wrote:
>
> I am trying to include 80 aerial photographs.  The size of each of the
> photos is circa 25 MB.  I converted them from 24 bit jpg pictures to 8
> bit tif images with image alchemy.  When I include one of the pictures
> in the mapping file the image is in a pretty good quality.  When I
> include five or more pictures, the quality of the pictures deteriorates.
>  I get white and gray pixels in the images where they don't belong.  It
> almost looks like the red channel is missing.  When I view the pictures
> in Corel Photo paint, the colors seem to be all right.
>
> Can anybody help me out?
>
> Thanks,
>
> Iris