[mapserver-users] Re: quick question from mapserver beginner!

[tigana.fluens at gmail.com]

can anyone can help me? im just missing something : /

On 5/12/2010 8:49 PM, Asuka Milano wrote:
> i hope this is the right way to reply, i just clicked on reply and 
> sent it again to mapserver-users at lists.osgeo.org :) thanks for the 
> comment, but i guess i didnt explain my situation well on my first post
>
> BASELAYER: google hybrid
> OVERLAY: my own mapserver map with a single LAYER - an image of a field
>
> as you can see in the picture (here it is again: 
> http://img688.imageshack.us/img688/5926/99138762.jpg), im really ok 
> with rectangular shape of the overlay, the problem is that i want it 
> to be smaller. i already made the layer small but the map itself with 
> a black background remains big. in my case to start with, i can do 
> fine with a map with just the size of its only layer. did i explain 
> that well? :P
>
> to make it clearer, imagine this sample scenario:
> - google doesnt have a close up image of my house
> - i have my own aerial high resolution image of my house so i want to 
> overlay it above the image google provides
> - problem: i already put my own image of my house above google's but 
> the background of the map (which i assume is IMAGECOLOR 0 0 0) covers 
> everything else
> - i dont want to provide a raster of the entire world (im saying this 
> because the black part covers almost the whole world), only of my house
> - i believe it is possible to create a map with just a specific extent 
> right? since there are SIZE and EXTENT values on the map file. but i 
> dont know why it's not working for me
>
>
> sorry if i misunderstood some stuff.. thanks again!
>
> On 5/12/2010 8:28 PM, mattmendick wrote:
>> You first have to make sure you are outputting the image as a png or 
>> some
>> other image format that supports transparency. Like this, at the base 
>> of the
>> mapfile:
>>
>>          OUTPUTFORMAT
>>                          NAME mypng
>>                          DRIVER "GD/PNG"
>>                          IMAGEMODE RGB
>>                          FORMATOPTION "INTERLACE=false"
>>                          MIMETYPE "image/png"
>>                          EXTENSION "png"
>>          END
>>          IMAGETYPE mypng
>>
>> Then, if your source image is not perfectly square, and has black in 
>> areas
>> that you want to be transparent, you can use the "OFFSITE [R] [G] [B]"
>> attribute. This tells mapserver that any color in the raster that 
>> matches
>> the color in your OFFSITE parameter should be rendered transparent.
>>
>> ex:
>>
>> LAYER
>>         NAME "blah"
>>         DATA '/path/to/raster.tiff'
>>         OFFSITE 0 0 0
>> END
>>
>> This has worked for me in the past, I hope it works for you.
>>
>> -Matt Mendick
>