[MS4W-Users] [ms4w-users] agg + transparency + quantize not working

[Tiemens, Gerben]

In addition to previous email :  further testing revealed that the transparent color is always black.
So if I set

imagecolor 99 99 99
transparent = true

And outputformat to:
OUTPUTFORMAT
    NAME "PNG_mapscript"
    MIMETYPE "image/png"
    DRIVER "GD/PNG"
    EXTENSION "PNG"
    IMAGEMODE "RGBA"
    TRANSPARENT TRUE
    FORMATOPTION "QUANTIZE_FORCE=on"
    FORMATOPTION "QUANTIZE_COLORS=256"
    FORMATOPTION "QUANTIZE_NEW=on"
 END

The image appears grey.
The black labels with white backgroundcolor and black shadowcolor in original image are mapped to: white background with gray outline characters and transparent filling and the shadow is grayoutlined with transparent filling. Probably the antialiasing generates the grey outline, the black filling is converted to transparent.

Something is going wrong.


If I set output format to:

 OUTPUTFORMAT
    NAME "PNG_mapscript"
    MIMETYPE "image/png; mode=24bit"
    DRIVER "AGG/PNG"
    EXTENSION "PNG"
    IMAGEMODE "RGBA"
    TRANSPARENT TRUE
    FORMATOPTION "QUANTIZE_FORCE=on"
    FORMATOPTION "QUANTIZE_DITHER=off"
    FORMATOPTION "QUANTIZE_COLORS=256"
  END

The same applies for the text/labels,  but background of the image is now black in all circumstances (no matter what color of imagecolor setting.


Greetings
Gerben


-----Oorspronkelijk bericht-----
Van: ms4w-users-bounces at lists.maptools.org [mailto:ms4w-users-bounces at lists.maptools.org] Namens G. Tiemens
Verzonden: Thursday, November 05, 2009 1:46 PM
Aan: ms4w-users at lists.maptools.org
Onderwerp: [MS4W-Users] [ms4w-users] agg + transparency + quantize not working


I am busy writing a application with mapscript in C#.

Currently I am facing the earlier mentioned problems of agg + transparent images + quantization.
Is the new MS4W compiled with the quantization options?

The image background is now Black. The labels are dissapearing.
It should be an image wich is completly transparent with some colored lines and some black labels.

Setting the imagecolor will not help me.
Images without quantization options on, are perfect and beautiful png's.


What I am using now is this:
MS4W 3.0 Beta 7
C# mapscript


Mapfile is completely written in C#, so all default options apply.
I saved

MAP
  EXTENT 104952 495303 105452 495803
  IMAGECOLOR 255 255 255
  IMAGETYPE gif
  SIZE 2000 2000
  STATUS ON
  UNITS METERS
  NAME "MS"

  OUTPUTFORMAT
    NAME "PNG_mapscript"
    MIMETYPE "image/png; mode=24bit"
    DRIVER "AGG/PNG"
    EXTENSION "PNG"
    IMAGEMODE "RGBA"
    TRANSPARENT TRUE
    FORMATOPTION "QUANTIZE_FORCE=on"
    FORMATOPTION "QUANTIZE_DITHER=off"
    FORMATOPTION "QUANTIZE_COLORS=256"
  END

  SYMBOL
    NAME "circle"
    TYPE ELLIPSE
    FILLED TRUE
    POINTS
      1 1
    END
  END
--
*snip*
--
END








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