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Bug #79473 Invalid statistics for 32-bit FITS
Submitted: 2020-04-14 10:31 UTC Modified: 2021-08-15 04:22 UTC
From: gajowy at agzeta dot pl Assigned: cmb (profile)
Status: No Feedback Package: imagick (PECL)
PHP Version: 7.3.16 OS: Windows 10
Private report: No CVE-ID: None
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From: gajowy at agzeta dot pl
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 [2020-04-14 10:31 UTC] gajowy at agzeta dot pl
Description:
------------
When using getImageChannelStatistics, getImageChannelRange and getImageChannelMean for 32-bit FITS image file, results are invalid.

Test script:
---------------
$channel=imagick::CHANNEL_GRAY;

$img = new Imagick();

$img->readImage('TestFile32.fit');

printf("getImageChannelRange = %s\n",print_r($img->getImageChannelRange($channel),TRUE));

printf("getImageChannelMean = %s\n",print_r($img->getImageChannelMean($channel),TRUE));

$sta=$img->getImageChannelStatistics();

printf("getImageChannelStatisctics = %s\n",print_r($sta[$channel],TRUE));

print_r($sta);

$img->destroy();

Expected result:
----------------
getImageChannelRange = Array
(
    [minima] => 0
    [maxima] => 4294967295
)

getImageChannelMean = Array
(
    [mean] => 93651004.9791211685
    [standardDeviation] => 40492390.85557395135
)

getImageChannelStatisctics = Array
(
    [mean] => 93651004.9791211685
    [minima] => 0
    [maxima] => 4294967295
    [standardDeviation] => 40492390.85557395135
    [depth] => 32
)

Actual result:
--------------
getImageChannelRange = Array
(
    [minima] => -9.3130836376076E-10
    [maxima] => 65535
)

getImageChannelMean = Array
(
    [mean] => 1428.9791211685
    [standardDeviation] => 617.85557395135
)

getImageChannelStatisctics = Array
(
    [mean] => 0
    [minima] => 1.7976931348623E+308
    [maxima] => -1.7976931348623E+308
    [standardDeviation] => -0
    [depth] => 1
)

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 [2021-08-02 14:02 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2021-08-02 14:02 UTC] cmb@php.net
Please make TestFile32.fit publicly available for download.
 [2021-08-15 04:22 UTC] pecl-dev at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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