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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
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();

Expected result:
Value 32768 is used instead for BZERO.

Actual result:
BZERO is 3.276750E+04


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