BEAM

VISAT colour manipulation window shall signal inexact statistics

Details

  • Type: Improvement Improvement
  • Status: Closed Closed
  • Priority: Critical Critical
  • Resolution: Fixed
  • Affects Version/s: 4.5
  • Fix Version/s: 4.5.1, 4.6
  • Component/s: VISAT
  • Labels:
    None

Description

In BEAM 4.2 and older, the statistics (min/max/histogram) shown by the VISAT colour manipulation window have been exact, because they where derived from all the samples of a tie-point grid or band..

Since BEAM 4.5, the statistics used by the VISAT colour manipulation window are derived from a lower-resolution version of the data image of the displayed tie-point grid or band in order to speed up the image generation for very high-resolution images. Thus, the statistics displayed are inexact. Exact statistics can be obtained in BEAM 4.5 by using the VISAT statistics computation window. Once the statistics have been computed for all samples, these are also used in the VISAT colour manipulation window.

The VISAT colour manipulation window shall signal that the displayed statistics are inexact, e.g. by using a different colour and/or and additional text. It should ideally also provide an action to compute exact statistics.

Issue Links

is duplicated by

Bug - A problem which impairs or prevents the functions of the product. BEAM-917 Value of a single pixel is not considered in histogram

  • Minor - Minor loss of function, or other problem where easy workaround is present.
  • Closed - The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.
see also

Bug - A problem which impairs or prevents the functions of the product. BEAM-893 Inconsistent handling of colour palettes in VISAT colour manipulation window

  • Critical - Crashes, loss of data, severe memory leak.
  • Closed - The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.

Activity

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Marco Peters added a comment -
A text is displayed if the accuracy is high or low.
A button is added to the colour manipulation window which allows to
trigger the exact histogram computation.
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Marco Peters added a comment - A text is displayed if the accuracy is high or low. A button is added to the colour manipulation window which allows to trigger the exact histogram computation.
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Olga Faber added a comment -
OK
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Olga Faber added a comment - OK

People

  • Assignee:
    Olga Faber
    Reporter:
    Norman Fomferra
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Dates

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    Updated:
    Resolved: