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Bug #79052 Incorrect BZERO in FITS header
Submitted: 2020-01-01 03:29 UTC Modified: -
From: gajowy at agzeta dot pl Assigned:
Status: Open Package: imagick (PECL)
PHP Version: 7.3.13 OS: Windows
Private report: No CVE-ID: None
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 [2020-01-01 03:29 UTC] gajowy at agzeta dot pl
Description:
------------
When creating 16-bit FITS file, a value of BZERO header is set literaly to "3.276750E+04", what is 32767.5
In this case it is impossible to store correct pixel value in 16-bits, as it's calculated as follows:
true_pixel_value = array_value * BSCALE + BZERO


Test script:
---------------
$im= new Imagick();
$im->newImage(1,1,'none','FITS');
$im->setImageDepth(16);
$im->writeImage('file.fit');
$im->destroy();


Expected result:
----------------
Value 32768 is used instead for BZERO.

Actual result:
--------------
BZERO is 3.276750E+04

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Last updated: Tue Aug 11 04:01:26 2020 UTC