Thanks Steve I still (unfortunatelly) don't understand why I am getting the "same quality" image on the paper with the first and second print (the second image has twice more pixels). Is it because of the input image itself? To be specific - the raster input is aerial image that gdalinfor reports as:
Driver: GTiff/GeoTIFF Files: 5C14-05-DOF.tif Size is 4500, 6000 Coordinate System is `' Origin = (5419000.154658853100000,4964998.794652804700000) Pixel Size = (0.499829146050620,-0.499829146050620) Corner Coordinates: Upper Left ( 5419000.155, 4964998.795) Lower Left ( 5419000.155, 4961999.820) Upper Right ( 5421249.386, 4964998.795) Lower Right ( 5421249.386, 4961999.820) Center ( 5420124.770, 4963499.307) Band 1 Block=256x256 Type=Byte, ColorInterp=Red Overviews: 2250x3000, 1125x1500, 563x750, 282x375 Band 2 Block=256x256 Type=Byte, ColorInterp=Green Overviews: 2250x3000, 1125x1500, 563x750, 282x375 Band 3 Block=256x256 Type=Byte, ColorInterp=Blue Overviews: 2250x3000, 1125x1500, 563x750, 282x375 regards, dejan "Steve Lime" <[EMAIL PROTECTED]> wrote on 30.07.2008 21:13:55: > Resolution in MapServer-speak is referring to the resolution of the > output device a map > will be displayed on. The value is used for scale computations and > nothing else. It does not > affect the size (in pixels) of MapServer. Scale values do impact the > size at which features > and text are rendered IF scaling (via SYMBOLSCALE) is turned on. > Higher quality output is > usually a matter of having more pixels to print, however you usually > want larger features > too which is where the resolution parameter combined with scaling can help. > > Steve > > >>> On 7/30/2008 at 2:21 AM, in message > <[EMAIL PROTECTED]>, > <[EMAIL PROTECTED]> wrote: > > Hi, > > > > I am trying to download a high resolution image and print it on a paper. I > > am using p.mapper and its download function that enables downloading the > > map image on different resolutions. > > > > I have turned on my raster layer (ortophoto image). I have zoomed in to an > > area of interest. I have downloaded the map twice - with a resolution of > > 150 and 300. The image is shown i a new page/tab (firefox). I right click > > on the image and save it as a png (also tried with a jpeg) file. Now, the > > first file is 2150x1111 pixels, 120 dpi vertical and horizontal resolution > > (right click on a file, properties, summary, what does it mean?), the > > second file is 4300x2222 pixels, 120 dpi vertical and horizontal > > resolution. Seems ok. The second image is "doubled" in pixel size. > > > > Now, when I try to print this image on A4 paper, using 300dpi, the images > > are the same, there is no "better quality" in second image. > > > > I have just finshed reading the Mapserver thread on "Change image > > resolution in mapfile". Several limitations are mentioned there - max. > > image size supported by Mapserver, "resolution" value/tag embedded in > > output format, etc. Can it be related to my problem? Or is it maybe that > > software I am using to print this image doesn't "use" this extra pixels? > > Or I am just missing some basic stuff I need to know :-( > > > > > > thanks very much on any explanation > > > > regards, dejan >
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