CLAMP_VAL(9) Driver Basics CLAMP_VAL(9)NAME
clamp_val - return a value clamped to a given range using val's type
SYNOPSIS
clamp_val(val, min, max);
ARGUMENTS
val
current value
min
minimum allowable value
max
maximum allowable value
DESCRIPTION
This macro does no typechecking and uses temporary variables of whatever type the input argument 'val' is. This is useful when val is an
unsigned type and min and max are literals that will otherwise be assigned a signed integer type.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 CLAMP_VAL(9)
Check Out this Related Man Page
pfsclamp(1) General Commands Manual pfsclamp(1)NAME
pfsclamp - Clamp color and luminance channel values to be within the specified range
SYNOPSIS
pfsclamp [--min <minimum>] [--max <maximum>] [--percentile] [--zero] [--rgb]
DESCRIPTION
Use this command to clamp values of luminance and color channels to be within the specified range. I.e. if a value in the channel is above
the specified maximum or below specified minimum, set the value to either minimum or maximum.
The command operates directly on XYZ channels.
OPTIONS --min <val>
Lower bound for clamping. Default value: 0.0001 (10^-4)
--max <val>
Upper bound for clamping. Default value: 100000000 (10^8)
--percentile, -p
Treat given min and max values as a percentile.
--zero, -z
Set values out of clamping range to zero, instead of setting to specified maximum and minimum.
--rgb
Perform clamping in RGB space.
EXAMPLES
pfsin memorial.hdr | pfsclamp | pfsout memorial_cl.hdr
Remove possible out-of-range values, for examples zeros, from memorial image.
pfsin memorial.hdr | pfsclamp --max 0.95 -p | pfsout memorial_cl.hdr
Remove 5% of the brightest pixels from the original image.
SEE ALSO pfsin(1)pfsout(1)BUGS
Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de> and Grzegorz Krawczyk <krawczyk@mpi-sb.mpg.de>.
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