ConvertBits: Difference between revisions

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TODO - placeholder
 
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[[TODO]]
<div style="max-width:82em; min-width:42em;" >
{{AvsPlusFilter}}
</div>
__NOTOC__
 
<div style="max-width:62em; min-width:42em;" >
<!-- ==== Syntax and Parameters ==== -->
==== ConvertBits ====
Changes bit depth while keeping [[Avisynthplus_color_formats|color format]] the same, if possible. <br>
If the conversion is not possible &ndash; for example, converting [[RGB32]] to 16bit &ndash; an error is raised.
 
 
{{FuncDef
|ConvertBits(clip, int bits [, bool ''truerange'', int ''dither'', float ''scale'', int ''dither_bits'', bool ''fulls'', bool ''fulld'' ] )}}
 
 
''(older bit-depth conversion filters &ndash; deprecated)''
 
{{Func3Def
|ConvertToFloat(clip, int bits [, bool ''truerange'', int ''dither'', float ''scale'', int ''dither_bits'', bool ''fulls'', bool ''fulld'' ] )
|ConvertTo16bit(clip, int bits [, bool ''truerange'', int ''dither'', float ''scale'', int ''dither_bits'', bool ''fulls'', bool ''fulld'' ] )
|ConvertTo8bit(clip, int bits [, bool ''truerange'', int ''dither'', float ''scale'', int ''dither_bits'', bool ''fulls'', bool ''fulld'' ] )}}
 
 
:{{Par2||clip|(required)}}
::Source clip.
 
:{{Par2||bits|(required)}}
::Bit depth of output clip. Valid values: ''8'', ''10'', ''12'', ''14'', ''16'' (integer) or ''32'' (floating point).
 
:{{Par2|truerange|bool|true}}
::([[TODO]] if ''false'', seems to either do nothing or corrupt output)
::Only allowed with [[Planar]] color formats.
::If ''true'' (default), convert 10-16 bit formats without re-scaling underlying pixel data. For example,
::&nbsp; <code>clip10bit.'''ConvertBits'''(16, {{FuncArg|truerange}}=false)</code>
::will leave pixel data in the 0..1023 range, but will change the [[Avisynthplus_color_formats|color format]] from ''YUVxxxP10'' to ''YUVxxxP16''.
::
::''Current recommendation: do not specify a {{FuncArg|truerange}} argument &ndash; use the default value.''
 
:{{Par2|dither|int|-1}}
::If ''0'', add [[Ordered_dithering|ordered dither]]; if ''-1'' (default), do not add dither.
::Currently works only for 10-16bit &rarr; 8bit conversions.
 
:{{Par2|scale|float|1.0}}
::([[TODO]] no apparent change in output)
::Only allowed for 32bit &rarr; 32bit.
::
::''Current recommendation: do not specify a {{FuncArg|scale}} argument &ndash; use the default value.''
 
:{{Par2|dither_bits|int|{{Template:FuncArg|bits}}}}
::Dither to a lower color depth than selected {{FuncArg|bits}} (default = {{FuncArg|bits}})
::No effect if {{FuncArg|dither}}=-1 (off).
::* Must be an even number between 2 to {{FuncArg|bits}}, inclusive.
::* In addition, {{FuncArg|dither_bits}} must be >= ({{FuncArg|clip}}.[[Clip_properties#Color_Format|BitsPerComponent]]-8)
:::{| class="wikitable"
|+ style="text-align:left"|''Examples''
!Conversion&nbsp;&nbsp;
!Allowed Values&nbsp;
|-
|16 &rarr; 12bit
|8, 10, 12
|-
|16 &rarr; 10bit
|8, 10
|-
|16 &rarr; &nbsp;&nbsp;8bit
|8
|-
|14 &rarr; 10bit
|6, 8, 10
|-
|14 &rarr; &nbsp;&nbsp;8bit
|6, 8
|-
|12 &rarr; 10bit
|4, 6, 8, 10
|-
|12 &rarr; &nbsp;&nbsp;8bit
|4, 6, 8
|-
|10 &rarr; &nbsp;&nbsp;8bit
|2, 4, 6, 8
|}
 
:{{Par2|fulls|bool|(auto)}}
::If ''true'' (rgb default), scale by multiplication: 0-255 &rarr; 0-65535;
::if ''false'' (yuv default), scale by [[wikipedia:Arithmetic_shift|bit-shifting]].
::Use case: override greyscale conversion to fullscale instead of bit-shifts
::''Notes:''
::* Conversion from and to float is always full-scale
::* Alpha plane is always treated as full scale
::* At the moment, {{FuncArg|fulld}} ''must'' equal {{FuncArg|fulls}}.
::
::''Current recommendation: do not specify a {{FuncArg|fulls}} argument &ndash; use the default value.''
 
:{{Par2|fulld|bool|{{Template:FuncArg|fulls}}}}
::''Current recommendation: do not specify a {{FuncArg|fulld}} argument &ndash; use the default value.''
 
 
<!--
==== Examples ====
<div style="max-width:62em; min-width:42em;" >
<div {{BoxWidthIndent|54|2}} >
#combine greyscale clips into YUVA clip
U8 = source.UToY8()
V8 = source.VToY8()
Y8 = source.ConvertToY()
A8 = source.AddAlphaPlane(128).AToY8()
CombinePlanes(Y8, U8, V8, A8, planes="YUVA", source_planes="YYYY",
\              sample_clip=source) #pixel_type="YUV444P8"
</div>
 
<div {{BoxWidthIndent|54|2}} >
# Copy planes between planar RGB(A) and YUV(A) without any conversion
# yuv 4:4:4 <-> planar rgb
source = last.ConvertBits(32) # 4:4:4
cast_to_planarrgb = CombinePlanes(source, planes="RGB", source_planes="YUV",
\              pixel_type="RGBPS")
# get back a clip identical with "source"
cast_to_yuv = CombinePlanes(cast_to_planarrgb, planes="YUV", source_planes="RGB",
\              pixel_type="YUV444PS")
</div>
 
<div {{BoxWidthIndent|54|2}} >
#create a black and white planar RGB clip using Y channel
#source is a YUV clip
grey = CombinePlanes(source, planes="RGB", source_planes="YYY",
\              pixel_type="RGBP8")
</div>
 
<div {{BoxWidthIndent|54|2}} >
#copy luma from one clip, U and V from another
#source is the template
#sourceY is a Y or YUV clip
#sourceUV is a YUV clip
grey = CombinePlanes(sourceY, sourceUV, planes="YUV",
\              source_planes="YUV", sample_clip = source)
</div>
-->
 
==== Changes ====
{|border=1 cellspacing=1 cellpadding=4
|-
| 20170310 r2440
| parameter ''dither_bits''
|-
| 20170202 r2420
| parameters ''fulls'', ''fulld''
|}
</div>
 
[[Category:Internal_filters]]
[[Category:Colourspace_Conversion]]
[[Category:Deep_color_tools]]
[[Category:Avisynthplus]]
[[Category:Avisynthplus]]

Revision as of 07:36, 7 June 2017

AVS+
This feature is specific to AviSynthPlus.

It is not supported in other AviSynth versions.


ConvertBits

Changes bit depth while keeping color format the same, if possible.
If the conversion is not possible – for example, converting RGB32 to 16bit – an error is raised.


ConvertBits(clip, int bits [, bool truerange, int dither, float scale, int dither_bits, bool fulls, bool fulld ] )


(older bit-depth conversion filters – deprecated)

ConvertToFloat(clip, int bits [, bool truerange, int dither, float scale, int dither_bits, bool fulls, bool fulld ] )
ConvertTo16bit(clip, int bits [, bool truerange, int dither, float scale, int dither_bits, bool fulls, bool fulld ] )
ConvertTo8bit(clip, int bits [, bool truerange, int dither, float scale, int dither_bits, bool fulls, bool fulld ] )


clip   = (required)
Source clip.
bits   = (required)
Bit depth of output clip. Valid values: 8, 10, 12, 14, 16 (integer) or 32 (floating point).
bool  truerange = true
(TODO if false, seems to either do nothing or corrupt output)
Only allowed with Planar color formats.
If true (default), convert 10-16 bit formats without re-scaling underlying pixel data. For example,
  clip10bit.ConvertBits(16, truerange=false)
will leave pixel data in the 0..1023 range, but will change the color format from YUVxxxP10 to YUVxxxP16.
Current recommendation: do not specify a truerange argument – use the default value.
int  dither = -1
If 0, add ordered dither; if -1 (default), do not add dither.
Currently works only for 10-16bit → 8bit conversions.
float  scale = 1.0
(TODO no apparent change in output)
Only allowed for 32bit → 32bit.
Current recommendation: do not specify a scale argument – use the default value.
int  dither_bits = bits
Dither to a lower color depth than selected bits (default = bits)
No effect if dither=-1 (off).
  • Must be an even number between 2 to bits, inclusive.
  • In addition, dither_bits must be >= (clip.BitsPerComponent-8)
Examples
Conversion   Allowed Values 
16 → 12bit 8, 10, 12
16 → 10bit 8, 10
16 →   8bit 8
14 → 10bit 6, 8, 10
14 →   8bit 6, 8
12 → 10bit 4, 6, 8, 10
12 →   8bit 4, 6, 8
10 →   8bit 2, 4, 6, 8
bool  fulls = (auto)
If true (rgb default), scale by multiplication: 0-255 → 0-65535;
if false (yuv default), scale by bit-shifting.
Use case: override greyscale conversion to fullscale instead of bit-shifts
Notes:
  • Conversion from and to float is always full-scale
  • Alpha plane is always treated as full scale
  • At the moment, fulld must equal fulls.
Current recommendation: do not specify a fulls argument – use the default value.
bool  fulld = fulls
Current recommendation: do not specify a fulld argument – use the default value.


Changes

20170310 r2440 parameter dither_bits
20170202 r2420 parameters fulls, fulld
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