Map image size

[Ed McNierney]

John -

I'm not Steve, but I'm a friend of his - is that close enough <g>?

The image I get from that URL is not 70K.  Did you change the image format to GIF (possibly changing it from JPEG)?  GIF and PNG are very good choices for "line art" images (not photographs or scanned maps) and JPEG is a better choice for imagery (scanned maps and photos).  You will commonly see a 3x to 5x difference in file size if you use the "wrong" image type.

     - Ed

Ed McNierney
TopoZone.com

----- Original Message -----
From: John Bolster <jb at NUCOMP.COM>
To: MAPSERVER-USERS at LISTS.UMN.EDU
Sent: Tue, 12 Oct 2004 17:17:37 -0400
Subject: [UMN_MAPSERVER-USERS] Map image size


> Dear Steve,
> 
> I was looking at your Tiger Data Browser and I noticed that for roughly the
> same image size, with roughly the same features drawn, your map image is
> somewhere in the region of 12K whereas mine is nearly 70K. Any ideas how
> that could be? Here are the urls I used to compare:
> 
> Yours:
> http://imaptools.com/tiger/?PREVIOUS_MODE=1&txtZoomFactor=2&ROSA_CMD=ZOOM_IN
> &PrevStateKey=BBOX%3D-83.1391875%2C27.10938125%2C-82.137234375%2C28.11094375
> %7CSRS%3Dproj%3Dlatlong%7CMAPSIZE%3D500%2C500%7CLAYERS%3D0%2C1%2C2%2C3%2C4%2
> C5%2C6%2C7%2C8%2C9%2C10%2C11%2C12%2C15%2C16%2C17%2C18%2C19%2C20%2C21%2C22%2C
> 23%2C24%2C25%2C26%2C27%2C28%2C29%2C30&NotFirstLoad=1&RosaMode=0&INPUT_TYPE=&
> INPUT_COORD=263%2C302&QueryString=&mainmap.x=239&mainmap.y=242
> 
> Mine:
> http://www.sunnydaysmarketing.com/cgi-bin/mapserv?map=sdm.map&mapext=-82.656
> 573+27.359223+-82.656573+27.859223&mode=map&map_projection=proj=sinu,lon_0=-
> 82.656573&layers=counties+places+statelines+hwy+native+water+misc
> 
> Thanks for any hints you might have on this.
> 
> John Bolster
>