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Bug #79052 Incorrect BZERO in FITS header
Submitted: 2020-01-01 03:29 UTC Modified: 2021-08-02 14:01 UTC
From: gajowy at agzeta dot pl Assigned: cmb (profile)
Status: Not a bug 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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 [2021-08-02 14:01 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2021-08-02 14:01 UTC] cmb@php.net 
This doesn't look like an issue with the imagick extension, but
rather an issue of ImageMagick.  Consider to report that
upstream[1].

[1] <https://github.com/ImageMagick/ImageMagick/issues>
 
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