ConvertBits

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==== ConvertBits ====
 
==== ConvertBits ====
 
Changes bit depth while keeping [[Avisynthplus_color_formats|color format]] the same, if possible. <br>
 
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.
+
If the conversion is not possible &ndash; for example, converting [[RGB32]] to 14bit &ndash; an error is raised.
  
  
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::Source clip.  
 
::Source clip.  
  
−
:{{Par2||bits|(required)}}
+
:{{Par2|bits|int|(actual bit depth)}}
−
::Bit depth of output clip. Valid values: ''8'', ''10'', ''12'', ''14'', ''16'' (integer) or ''32'' (floating point).  
+
::Bit depth of output clip. If provided valid values are: ''8'', ''10'', ''12'', ''14'', ''16'' (integer) or ''32'' (floating point).  
 +
::From 3.7.1 parameter is optional since no bitdepth change is needed when doing only range conversion (fulls-fulld) or artistic dithering (dither_bits<bit depth)
 +
::<3.7.1: required
  
 
:{{Par2|truerange|bool|true}}
 
:{{Par2|truerange|bool|true}}
 +
::Hint: forget it. Deprecated, do not use. Maybe once removed.
 
::When converting from true 10-16 bit formats, {{FuncArg|truerange}}=false indicates bitdepth of 16 bits regardless of the 10-12-14 bit format. Not applicable for non planar formats.
 
::When converting from true 10-16 bit formats, {{FuncArg|truerange}}=false indicates bitdepth of 16 bits regardless of the 10-12-14 bit format. Not applicable for non planar formats.
  
 
{{HiddenAnchor|dither}}
 
{{HiddenAnchor|dither}}
 
:{{Par2|dither|int|-1}}
 
:{{Par2|dither|int|-1}}
−
::If ''0'', add [[Ordered_dithering|ordered dither]]; if ''-1'' (default), do not add dither.
+
::*If ''-1'' (default), do not add dither;
−
::Dithering is allowed only for scaling down (bit depth reduction), not up.
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::*If ''0'', add [[Ordered_dithering|ordered]] dither;
−
::Dithering is allowed only for 10-16bit (not 32bit float) sources.
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::*If ''1'', add [[wikipedia:Floyd–Steinberg_dithering|error diffusion (Floyd-Steinberg)]] dither <sup>[http://forum.doom9.org/showthread.php?p=1838145#post1838145 doom9]</sup>
 +
::Dithering is allowed only for scaling down (bit depth reduction), not up. Bit depth can be kept though if a smaller dither_bits is given.
 +
::From 3.7.1: no limit. Note: (behind the scenes) 32 bit float clips are first converted down to 16 (or less if needed) bits, then are further dithered down from this intermediate clip.
 +
::<3.7.1: Dithering is allowed only for 10-16bit (not 32bit float) sources.
  
 
:{{Par2|dither_bits|int|{{Template:FuncArg|bits}}}}
 
:{{Par2|dither_bits|int|{{Template:FuncArg|bits}}}}
 
::Exaggerated dither effect: dither to a lower color depth than required by {{FuncArg|bits}} argument.
 
::Exaggerated dither effect: dither to a lower color depth than required by {{FuncArg|bits}} argument.
 
::Has no effect if {{FuncArg|dither}}=''-1'' (off).
 
::Has no effect if {{FuncArg|dither}}=''-1'' (off).
−
::* Must be an even number from ''2'' to {{FuncArg|bits}}, inclusive.
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::* from 3.7.1 Arbitrary number from 1 to {{FuncArg|bits}}, inclusive.
−
::* In addition, must be >= ({{FuncArg|clip}}.[[Clip_properties#Color_Format|BitsPerComponent]]-8).
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::* <3.7.1: Must be an even number from ''2'' to {{FuncArg|bits}}, inclusive.
−
:::{| class="wikitable"
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::* <3.7.1: In addition, must be >= ({{FuncArg|clip}}.[[Clip_properties#Color_Format|BitsPerComponent]]-8).
−
|+ style="text-align:left"|''Examples''
+
−
!Conversion&nbsp;&nbsp;
+
−
!Allowed Values&nbsp;
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−
|-
+
−
|16 &rarr; 12bit
+
−
|8, 10, 12
+
−
|-
+
−
|16 &rarr; 10bit
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−
|8, 10
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−
|-
+
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|16 &rarr; &nbsp;&nbsp;8bit
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−
|8
+
−
|-
+
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|14 &rarr; 10bit
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−
|6, 8, 10
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−
|-
+
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|14 &rarr; &nbsp;&nbsp;8bit
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−
|6, 8
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−
|-
+
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|12 &rarr; 10bit
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|4, 6, 8, 10
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−
|-
+
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|12 &rarr; &nbsp;&nbsp;8bit
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−
|4, 6, 8
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−
|-
+
−
|10 &rarr; &nbsp;&nbsp;8bit
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−
|2, 4, 6, 8
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−
|}
+
−
 
+
 
:{{Par2|fulls|bool|(auto)}}
 
:{{Par2|fulls|bool|(auto)}}
 
::''Use the default value unless you know what you are doing.''
 
::''Use the default value unless you know what you are doing.''
−
::If ''true'' (RGB default), scale by multiplication: 0-255 &rarr; 0-65535;
+
::Default value can come from <code>_ChromaRange</code> frame property
 +
::If ''true'' (RGB default), scale by multiplication: 0-255 &rarr; 0-65535; <p>Note: full scale U and V chroma is specially handled</p>
 
::if ''false'' (YUV default), scale by [[wikipedia:Arithmetic_shift|bit-shifting]].
 
::if ''false'' (YUV default), scale by [[wikipedia:Arithmetic_shift|bit-shifting]].
 
::Use case: override greyscale conversion to fullscale instead of bit-shifts.
 
::Use case: override greyscale conversion to fullscale instead of bit-shifts.
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:{{Par2|fulld|bool|{{Template:FuncArg|fulls}}}}
 
:{{Par2|fulld|bool|{{Template:FuncArg|fulls}}}}
 
::''Use the default value unless you know what you are doing.''
 
::''Use the default value unless you know what you are doing.''
−
::At the moment, ''must'' match {{FuncArg|fulls}}.
+
::From 3.7.1: can be any combination with {{FuncArg|fulls}}.
 +
::<3.7.1: ''must'' match {{FuncArg|fulls}}.
  
 +
 +
:ConvertBits writes <code>_ChromaRange</code> frame property (0-full or 1-limited)
  
 
<!--
 
<!--
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==== Changes ====
 
==== Changes ====
 
{|border=1 cellspacing=1 cellpadding=4
 
{|border=1 cellspacing=1 cellpadding=4
 +
|-
 +
| 3.7.1
 +
|parameter ''bits'' optional
 +
<p>_ChromaRange frame property handling</p>
 +
<p>Free fulls-fulld combination</p>
 +
<p>Free target dither_bits down to 1</p>
 +
<p>Allow dithering from 32 bit float</p>
 +
<p>Allow dithering while keeping actual bit depth (but with a smaller dither_bits)</p>
 +
<p>Specially handled full scale chroma</p>
 
|-
 
|-
 
| 20170310 r2440
 
| 20170310 r2440

Latest revision as of 03:02, 3 December 2023

AVS+
This feature is specific to AviSynthPlus.

It is not supported in other AviSynth versions.


[edit] ConvertBits

Changes bit depth while keeping color format the same, if possible.
If the conversion is not possible – for example, converting RGB32 to 14bit – an error is raised.


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


(older bit-depth conversion filters – deprecated)

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


clip   = (required)
Source clip.
int  bits = (actual bit depth)
Bit depth of output clip. If provided valid values are: 8, 10, 12, 14, 16 (integer) or 32 (floating point).
From 3.7.1 parameter is optional since no bitdepth change is needed when doing only range conversion (fulls-fulld) or artistic dithering (dither_bits<bit depth)
<3.7.1: required
bool  truerange = true
Hint: forget it. Deprecated, do not use. Maybe once removed.
When converting from true 10-16 bit formats, truerange=false indicates bitdepth of 16 bits regardless of the 10-12-14 bit format. Not applicable for non planar formats.
int  dither = -1
Dithering is allowed only for scaling down (bit depth reduction), not up. Bit depth can be kept though if a smaller dither_bits is given.
From 3.7.1: no limit. Note: (behind the scenes) 32 bit float clips are first converted down to 16 (or less if needed) bits, then are further dithered down from this intermediate clip.
<3.7.1: Dithering is allowed only for 10-16bit (not 32bit float) sources.
int  dither_bits = bits
Exaggerated dither effect: dither to a lower color depth than required by bits argument.
Has no effect if dither=-1 (off).
  • from 3.7.1 Arbitrary number from 1 to bits, inclusive.
  • <3.7.1: Must be an even number from 2 to bits, inclusive.
  • <3.7.1: In addition, must be >= (clip.BitsPerComponent-8).
bool  fulls = (auto)
Use the default value unless you know what you are doing.
Default value can come from _ChromaRange frame property
If true (RGB default), scale by multiplication: 0-255 → 0-65535;

Note: full scale U and V chroma is specially handled

if false (YUV default), scale by bit-shifting.
Use case: override greyscale conversion to fullscale instead of bit-shifts.
Conversion from and to float is always full-scale.
Alpha plane is always treated as full scale.
bool  fulld = fulls
Use the default value unless you know what you are doing.
From 3.7.1: can be any combination with fulls.
<3.7.1: must match fulls.


ConvertBits writes _ChromaRange frame property (0-full or 1-limited)


[edit] Changes

3.7.1 parameter bits optional

_ChromaRange frame property handling

Free fulls-fulld combination

Free target dither_bits down to 1

Allow dithering from 32 bit float

Allow dithering while keeping actual bit depth (but with a smaller dither_bits)

Specially handled full scale chroma

20170310 r2440 parameter dither_bits
20170202 r2420 parameters fulls, fulld
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