modification of pgblur to handle black frames

radiance-dev
1

Hi,

I want to propose a small modification to the pgblur script, right after assigning the command line parameters to variables:

set inp = "$3"
set Lzero = `pextrem $inp:q | tail -1 | rcalc -e '$1=if((.265*$3+.67*$4+.065*$5)-1e-5,0,1)'`
if ( $Lzero ) then
exec cat $inp:q
exit 0
endif

This outputs the original image if all pixel values are zero (well, below my arbitrarily chosen threshold) rather than producing an error. The motivation is that I want to filter frames resulting from CBDM. One could, of course, keep this test outside the script, but this eliminates one error condition.

Cheers,
Lars.

2

Hi Lars,

This shouldn't be an error condition. An all-zero image should pass through the pgblur command unchanged. Your way would take less time, but the results should be the same.

Confused,
-Greg

···

From: "Lars O. Grobe" <[email protected]>
Date: May 4, 2018 9:49:09 AM PDT

Hi,

I want to propose a small modification to the pgblur script, right after assigning the command line parameters to variables:

set inp = "$3"
set Lzero = `pextrem $inp:q | tail -1 | rcalc -e '$1=if((.265*$3+.67*$4+.065*$5)-1e-5,0,1)'`
if ( $Lzero ) then
        exec cat $inp:q
        exit 0
endif

This outputs the original image if all pixel values are zero (well, below my arbitrarily chosen threshold) rather than producing an error. The motivation is that I want to filter frames resulting from CBDM. One could, of course, keep this test outside the script, but this eliminates one error condition.

Cheers,
Lars.