GeoServer

GeoServer generates invalid PNG files when using raster symbolizers with extended color map

Details

  • Type: Bug Bug
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: 2.1.3
  • Fix Version/s: 2.1.5
  • Component/s: WMS
  • Labels:
    None
  • Number of attachments :
    1

Description

As reported by Nazareno in GEOS-4669, just use sf:dem altering its default style colormap with extended="true" and the resulting PNG won't show in the browsers and gdal_translate won't be able to open it either.

Issue Links

depends upon

Bug - A problem which impairs or prevents the functions of the product. GEOT-4144 ImageWorker.writePNG will write out paletted 16bit PNG files (which cannot exist, out of spec)

  • Major - Major loss of function.
  • Resolved - A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.
is related to

Bug - A problem which impairs or prevents the functions of the product. GEOS-4669 PNG image palette error when requesting GeoTiff from Geoserver

  • Major - Major loss of function.
  • Closed - The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.

Activity

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Andrea Aime added a comment -

And the reason why it does not work is simple, PNG does not support 16 bits palettes: "PNG supports three main image types: truecolor, grayscale and palette-based (8-bit)."
Source: http://www.libpng.org/pub/png/pngintro.html

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Andrea Aime added a comment - And the reason why it does not work is simple, PNG does not support 16 bits palettes: "PNG supports three main image types: truecolor, grayscale and palette-based (8-bit)." Source: http://www.libpng.org/pub/png/pngintro.html
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Andrea Aime added a comment -

Geotools part fixed, this allows to encode a 16 bit image into a RGB(A) PNG.
When asking for PNG8 though it still breaks, the attached patch should fix it but it's Sunday, it's late and I'm too tired to write a set of tests to prove it, rescheduling to next weekend for closure

Show
Andrea Aime added a comment - Geotools part fixed, this allows to encode a 16 bit image into a RGB(A) PNG. When asking for PNG8 though it still breaks, the attached patch should fix it but it's Sunday, it's late and I'm too tired to write a set of tests to prove it, rescheduling to next weekend for closure

People

  • Assignee:
    Andrea Aime
    Reporter:
    Andrea Aime
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Dates

  • Created:
    Updated: