PHP and Gamma values - Revision history

Dimitrios: Fixed an error in frames ahead

2012-02-09T01:08:36Z

Fixed an error in frames ahead

← Older revision		Revision as of 01:08, 9 February 2012
Line 54:		Line 54:
	elphel_gamma_add($gammas["GTAB_G__0816"]/100, $gammas["GTAB_G__0824"]);		elphel_gamma_add($gammas["GTAB_G__0816"]/100, $gammas["GTAB_G__0824"]);
	// Apply the values at the frame ahead		// Apply the values at the frame ahead
	elphel_set_P_arr($gammas,$ahead);		elphel_set_P_arr($gammas, elphel_get_frame() + $ahead);
	}		}
	//		//

Dimitrios at 19:51, 8 February 2012

2012-02-08T19:51:48Z

← Older revision		Revision as of 19:51, 8 February 2012
Line 66:		Line 66:
	The parameters should be integers: ''1 < gamma <= 100'' and ''0 <= black <= 50''.		The parameters should be integers: ''1 < gamma <= 100'' and ''0 <= black <= 50''.

	The undocumented function '''elphel_gamma_add(int gamma, int black)''' is used, where the value of ''gamma'' for this function must be a float ''0.1 < gamma <= 1.0''. Without it the gamma values are not effected. ~~More~~ can be found in the file ''camvc.php'' in ''/mnt/flash/html''.		The undocumented function '''elphel_gamma_add(int gamma, int black)''' is used, where the value of ''gamma'' for this function must be a float ''0.1 < gamma <= 1.0''. Without it the gamma values are not effected. Relative code can be found in the file ''camvc.php'' in ''/mnt/flash/html'' in the camera.

Dimitrios at 19:28, 8 February 2012

2012-02-08T19:28:48Z

← Older revision		Revision as of 19:28, 8 February 2012
Line 34:		Line 34:
	// set gammas array and postpone setting values in the camera		// set gammas array and postpone setting values in the camera
	$value = intval($value);		$value = intval($value);
	$gammas["GTAB_R__0816"]=$value;		$gammas["GTAB_R__0816"]=$value;
	$gammas["GTAB_G__0816"]=$value;		$gammas["GTAB_G__0816"]=$value;
	$gammas["GTAB_GB__0816"]=$value;		$gammas["GTAB_GB__0816"]=$value;
	$gammas["GTAB_B__0816"]=$value;		$gammas["GTAB_B__0816"]=$value;
	break;		break;
	case "black":		case "black":
	// set gammas array and postpone setting values in the camera		// set gammas array and postpone setting values in the camera
	$value = intval($value);		$value = intval($value);
	$gammas["GTAB_R__0824"]=$value;		$gammas["GTAB_R__0824"]=$value;
	$gammas["GTAB_G__0824"]=$value;		$gammas["GTAB_G__0824"]=$value;
	$gammas["GTAB_GB__0824"]=$value;		$gammas["GTAB_GB__0824"]=$value;
	$gammas["GTAB_B__0824"]=$value;		$gammas["GTAB_B__0824"]=$value;
	break;		break;
	}		}

Dimitrios at 19:12, 8 February 2012

2012-02-08T19:12:08Z

← Older revision		Revision as of 19:12, 8 February 2012
Line 34:		Line 34:
	// set gammas array and postpone setting values in the camera		// set gammas array and postpone setting values in the camera
	$value = intval($value);		$value = intval($value);
	~~foreach (array(~~		$gammas["GTAB_R__0816"]=$value;
	"GTAB_R__0816",		$gammas["GTAB_G__0816"]=$value;
	"GTAB_G__0816",		$gammas["GTAB_GB__0816"]=$value;
	"GTAB_GB__0816",		$gammas["GTAB_B__0816"]=$value;
	~~"GTAB_B__0816"~~
	~~) as~~ $~~key)~~
	$gammas[~~$key~~] = $value;
	break;		break;
	case "black":		case "black":
	// set gammas array and postpone setting values in the camera		// set gammas array and postpone setting values in the camera
	$value = intval($value);		$value = intval($value);
	~~foreach (array(~~		$gammas["GTAB_R__0824"]=$value;
	"GTAB_R__0824",		$gammas["GTAB_G__0824"]=$value;
	"GTAB_G__0824",		$gammas["GTAB_GB__0824"]=$value;
	"GTAB_GB__0824",		$gammas["GTAB_B__0824"]=$value;
	~~"GTAB_B__0824"~~
	~~) as~~ $~~key)~~
	$gammas[~~$key~~] = $value;
	break;		break;
	}		}
Line 57:		Line 51:
	// Was postponed earlier		// Was postponed earlier
	if ($gammas != NULL) {		if ($gammas != NULL) {
			// values are taken from the green color
	elphel_gamma_add($gammas["GTAB_G__0816"]/100, $gammas["GTAB_G__0824"]);		elphel_gamma_add($gammas["GTAB_G__0816"]/100, $gammas["GTAB_G__0824"]);
	// Apply the values at the frame ahead		// Apply the values at the frame ahead

Dimitrios at 18:58, 8 February 2012

2012-02-08T18:58:04Z

← Older revision		Revision as of 18:58, 8 February 2012
Line 67:		Line 67:
	?>		?>

	The code looks for HTTP query parameters ''black'' (level of black) and ''gamma'' and sets them at the same time. The parameters should be integers: ''1 < gamma <= 100'' and ''0 <= black <= 50''.		The code looks for HTTP query parameters ''black'' (level of black) and ''gamma'' and sets them at the same time.

			The parameters should be integers: ''1 < gamma <= 100'' and ''0 <= black <= 50''.

	The undocumented function '''elphel_gamma_add(int gamma, int black)''' is used, where the value of ''gamma'' for this function must be a float ''0.1 < gamma <= 1.0''. Without it the gamma values are not effected. More can be found in the file ''camvc.php'' in ''/mnt/flash/html''.		The undocumented function '''elphel_gamma_add(int gamma, int black)''' is used, where the value of ''gamma'' for this function must be a float ''0.1 < gamma <= 1.0''. Without it the gamma values are not effected. More can be found in the file ''camvc.php'' in ''/mnt/flash/html''.

Dimitrios: Code to change gamma values in PHP

2012-02-08T18:56:31Z

Code to change gamma values in PHP

New page

=How to change Gamma values in an Elphel camera=

Changing Gamma and BlackLevel values at present requires some special treatment. Here is a short PHP script that does it:

<?php

// Set default frame ahead
if (!array_key_exists("ahead",$_GET))
$ahead=3;

// Special treatment for the gamma values and blacklevel.
// Get exising gamma values if a gamma parameter is requested
if (array_key_exists("gamma",$_GET) || array_key_exists("black",$_GET)) {
$gammas=array(
"GTAB_R__0816"=>"",
"GTAB_G__0816"=>"",
"GTAB_GB__0816"=>"",
"GTAB_B__0816"=>"",
"GTAB_R__0824"=>"",
"GTAB_G__0824"=>"",
"GTAB_GB__0824"=>"",
"GTAB_B__0824"=>""
);
// get existing gamma values
$gammas= elphel_get_P_arr($gammas);
}

foreach($_GET as $key=>$value) {

if(strtolower(substr($s, 0, 2))=="0x")
$value= hexdec($value);
switch ($key) {
case "gamma":
// set gammas array and postpone setting values in the camera
$value = intval($value);
foreach (array(
"GTAB_R__0816",
"GTAB_G__0816",
"GTAB_GB__0816",
"GTAB_B__0816"
) as $key)
$gammas[$key] = $value;
break;
case "black":
// set gammas array and postpone setting values in the camera
$value = intval($value);
foreach (array(
"GTAB_R__0824",
"GTAB_G__0824",
"GTAB_GB__0824",
"GTAB_B__0824"
) as $key)
$gammas[$key] = $value;
break;
}
// If any gamma value was set, set all gamma values in the camera.
// Was postponed earlier
if ($gammas != NULL) {
elphel_gamma_add($gammas["GTAB_G__0816"]/100, $gammas["GTAB_G__0824"]);
// Apply the values at the frame ahead
elphel_set_P_arr($gammas,$ahead);
}
//
// Add code to form the output here
}

?>

The code looks for HTTP query parameters ''black'' (level of black) and ''gamma'' and sets them at the same time. The parameters should be integers: ''1 < gamma <= 100'' and ''0 <= black <= 50''.
The undocumented function '''elphel_gamma_add(int gamma, int black)''' is used, where the value of ''gamma'' for this function must be a float ''0.1 < gamma <= 1.0''. Without it the gamma values are not effected. More can be found in the file ''camvc.php'' in ''/mnt/flash/html''.