Overlay - Revision history

Pinterf: Update for Avisynth+

2018-12-13T10:11:24Z

Update for Avisynth+

Raffriff42: tweak appearance

2017-04-23T09:05:53Z

tweak appearance

Raffriff42: tweak appearance

2017-04-23T00:28:17Z

tweak appearance

Raffriff42: use Template:AvsPluscon for consistency

2017-04-22T04:39:30Z

use Template:AvsPluscon for consistency

Raffriff42: note AVS+ differences * WIP *

2017-04-22T00:20:53Z

note AVS+ differences *** WIP ***

Raffriff42: small example image for each blend mode

2016-08-29T11:25:49Z

small example image for each blend mode

Raffriff42: /* See also */ added

2016-02-14T00:16:40Z

‎See also: added

Raffriff42: one more touch-up

2016-02-13T22:34:49Z

one more touch-up

Raffriff42: one more touch-up

2016-02-13T22:14:40Z

one more touch-up

Raffriff42: typo

2016-02-13T21:56:36Z

typo

@@ Line 6: / Line 6: @@
 *Input clips ({{FuncArg|base}}, {{FuncArg|overlay}} and {{FuncArg|mask}}) are converted to [[YV24]] internally. The output is re-converted to the input colorspace (or to the {{FuncArg|output}} colorspace, if specified).
 <div {{ListItemContinue}} >
-{{AvsPluscon}} works a little differently &ndash; see [[#use444|{{FuncArg|use444}}]], below.</div>
+{{AvsPluscon}} works a little differently, no 4:4:4 conversion occurs for "blend", "luma" and "chroma" modes; see [[#use444|{{FuncArg|use444}}]], below.</div>
 *In general all clips are treated as full-range values. This means that numbers will not be clipped at TV range; you may use [[Limiter]] for this task afterwards. If your {{FuncArg|mask}} is TV-range, you should convert it to full-range,or the mask will never be fully opaque.
@@ Line 39: / Line 39: @@
 :{{Par2|mask|clip|(full opacity)}}
-::Optional ''transparency mask''. Must be the same size as {{FuncArg|overlay}}. Where {{FuncArg|mask}} is darker, {{FuncArg|overlay}} will be more transparent. Must be 0-255 range. By default only the greyscale (luma) components are used, but this can be overridden with {{FuncArg|greymask}}=false.
+::Optional ''transparency mask''. Must be the same size as {{FuncArg|overlay}}. Where {{FuncArg|mask}} is darker, {{FuncArg|overlay}} will be more transparent. Must be 0-255 range (in general: 0 - 2^N-1 range for N bits format). By default only the greyscale (luma) components are used, but this can be overridden with {{FuncArg|greymask}}=false.
 :{{Par2|opacity|float|1.0}}
@@ Line 108: / Line 108: @@
 :{{Par2|output|string|(input)}}
 ::Set output colorspace. Possible values are "YV24", "YUY2", "YV12", "Y8", "RGB32" and "RGB24".
 :{{Par2|ignore_conditional|bool|false}}
@@ Line 118: / Line 119: @@
 :{{Par2|use444|bool|true}}
 ::{{AvsPluscon}} If set to false, '''Overlay''' uses conversionless mode where possible instead of going through YUV 4:4:4. However, for Luma and Chroma {{FuncArg|mode}}s, RGB ''must'' be converted to YUV 4:4:4.
 </div>
@@ Line 123: / Line 128: @@
 == RGB considerations ==
 <div style="max-width:62em" >
-[[RGB]] inputs are accepted. However, as '''Overlay''' converts internally to [[YV24]], this will lead to an RGB&rarr;YUV conversion. There are two modes for this conversion, toggled by the {{FuncArg|pc_range}} parameter. This parameter will extend the YUV range from 16-235 (this is the range used by all avisynth converters) to 0-255. There are some cases where enabling {{FuncArg|pc_range}} is a good idea:
+[[RGB]] inputs are accepted. However, as '''Overlay''' converts internally to [[YV24]] (see AVS+ exceptions), this will lead to an RGB&rarr;YUV conversion. There are two modes for this conversion, toggled by the {{FuncArg|pc_range}} parameter. This parameter will extend the YUV range from 16-235 (this is the range used by all avisynth converters) to 0-255. There are some cases where enabling {{FuncArg|pc_range}} is a good idea:
 * When overlaying an RGB clip using the ''add'', ''subtract'' or ''multiply'' modes, the range of the overlay clip is better, if it is 0-255, since this will enable completely dark areas not to influence the result (instead of adding 16 to every value).
 * When NOT doing a colorspace conversion on output. If the output colorspace (RGB vs. YUV) is different from the input, the scale will be wrong. If {{FuncArg|pc_range}}=true, and input is RGB, while output is YUY2, the YUY2 will have an invalid range, and not CCIR-601 range.
-* {{AvsPluscon}} [[TODO]]
+* {{AvsPluscon}} planar RGB formats are also supported besides 8 bit packed RGB formats and RGB48/RGB64.
 ===== ''Outputting RGB'' =====
-:It might be a good idea to let '''Overlay''' output YV24, even if your input colorspace is RGB, as this avoids a colorspace conversion back to RGB from YUV. You should however be aware that your material might be "overscaled", as mentioned above, if you use {{FuncArg|pc_range}}=true.  You can correct this by using <code>[[ColorYUV]](levels="pc->tv")</code> to convert back to 16-235 range.
+:It might be a good idea to let '''Overlay''' output YV24 (or YUV444P10-16 in AVS+), even if your input colorspace is RGB, as this avoids a colorspace conversion back to RGB from YUV. You should however be aware that your material might be "overscaled", as mentioned above, if you use {{FuncArg|pc_range}}=true.  You can correct this by using <code>[[ColorYUV]](levels="pc->tv")</code> to convert back to 16-235 range (or equivalent ranges to 10+ bits).
 ===== ''Inputting RGB for mask clip'' =====
 :An RGB {{FuncArg|mask}} clip may behave a bit oddly if it contains color information. If you use a greyscale mask, or if you leave {{FuncArg|greymask}}=true, you will get the result you would expect. Note that {{FuncArg|mask}} values are never scaled, so it will automatically be in full-range, directly copied from the RGB values.
-===== ''Using RGB32 alpha channel'' =====
+===== ''Using RGB32, {{AvsPluscon}} RGB64 or planar RGBA alpha channel'' =====
 :'''Overlay''' ignores the ''alpha'' (transparency) channel in an [[RGB32]] clip. If you want the alpha, you can use something like <code>Overlay(kitten, mask=kitten.[[ShowAlpha]]("RGB32"))</code>. For maximum quality, it is recommended to extract the alpha as RGB.
 ===== ''Repeated overlays on RGB base clip'' =====
-:When doing repeated partial overlays on an RGB base clip, the unchanged parts of the base clip will undergo a RGB&rarr;YV24&rarr;RGB conversion for each call to Overlay, producing a progressive loss of color accuracy. In these situations, it is better to convert the base clip to YV24 before doing the overlays and convert back to RGB afterwards.
+:When doing repeated partial overlays on an RGB base clip, the unchanged parts of the base clip will undergo a RGB&rarr;YV24&rarr;RGB conversion for each call to Overlay, producing a progressive loss of color accuracy. In these situations, it is better to convert the base clip to 4:4:4 format (e.g. YV24) before doing the overlays and convert back to RGB afterwards.
 </div>
@@ Line 300: / Line 306: @@
 == Changelog ==
 {| border="1"
 |-
 | v2.6

@@ Line 25: / Line 25: @@
 {{Template:FuncDef
 |Overlay(clip ''clip'', clip ''overlay'' [, int ''x'', int ''y'', clip ''mask'', float ''opacity'', string ''mode'',<br>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bool ''greymask'', string ''output'', bool ''ignore_conditional'', bool ''pc_range'', bool ''use444'' ] ){{AvsPluscon}}
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bool ''greymask'', string ''output'', bool ''ignore_conditional'', bool ''pc_range'', bool ''use444'' ] ) {{AvsPluscon}}
 }}

@@ Line 116: / Line 116: @@
 {{HiddenAnchor|use444}}
-:{{Par2|use444|bool|true{{AvsPluscon}} }}
+:{{Par2|use444|bool|true}}
-::If set to false, '''Overlay''' uses conversionless mode where possible instead of going through YUV 4:4:4. However, for Luma and Chroma {{FuncArg|mode}}s, RGB ''must'' be converted to YUV 4:4:4.
+::{{AvsPluscon}} If set to false, '''Overlay''' uses conversionless mode where possible instead of going through YUV 4:4:4. However, for Luma and Chroma {{FuncArg|mode}}s, RGB ''must'' be converted to YUV 4:4:4.
 </div>

@@ Line 6: / Line 6: @@
 *Input clips ({{FuncArg|base}}, {{FuncArg|overlay}} and {{FuncArg|mask}}) are converted to [[YV24]] internally. The output is re-converted to the input colorspace (or to the {{FuncArg|output}} colorspace, if specified).
 <div {{ListItemContinue}} >
-'''AVS+''' works a little differently &ndash; see [[#use444|{{FuncArg|use444}}]], below.</div>
+{{AvsPluscon}} works a little differently &ndash; see [[#use444|{{FuncArg|use444}}]], below.</div>
 *In general all clips are treated as full-range values. This means that numbers will not be clipped at TV range; you may use [[Limiter]] for this task afterwards. If your {{FuncArg|mask}} is TV-range, you should convert it to full-range,or the mask will never be fully opaque.

@@ Line 1: / Line 1: @@
-<div style="max-width:62em" >
+<div style="max-width:82em; min-width:42em;" >
 Puts clip {{FuncArg|overlay}} on top of clip {{FuncArg|base}} using different blend {{FuncArg|modes}}, and with optional {{FuncArg|x}},{{FuncArg|y}} positioning, {{FuncArg|mask}}ing and {{FuncArg|opacity}}.
-*Input clips ({{FuncArg|base}}, {{FuncArg|overlay}} and {{FuncArg|mask}}) are converted to [[YV24]] internally. The output is re-converted to the input colorspace (or to the {{FuncArg|output}} colorspace, if specified).
+*In general all clips are treated as full-range values. This means that numbers will not be clipped at TV range; you may use [[Limiter]] for this task afterwards. If your {{FuncArg|mask}} is TV-range, you should convert it to full-range,or the mask will never be fully opaque.
-−
-*In general all clips are treated as 0-255 values. This means that numbers will not be clipped at CCIR-601 range; you may use [[Limiter]] for this task afterwards. If your {{FuncArg|mask}} is 16-235, convert it to 0-255 &ndash; for example, with [[ColorYUV]](levels="TV->PC") &ndash; or the mask will never be fully opaque.
 *It is not recommended to do overlays on [[Interlaced_fieldbased|interlaced]] material, unless you know what you are doing.
@@ Line 16: / Line 20: @@
 {{Template:FuncDef
 |Overlay(clip ''clip'', clip ''overlay'' [, int ''x'', int ''y'', clip ''mask'', float ''opacity'', string ''mode'',<br>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bool ''greymask'', string ''output'', bool ''ignore_conditional'', bool ''pc_range''  ] )
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bool ''greymask'', string ''output'', bool ''ignore_conditional'', bool ''pc_range'' ] )
 }}
@@ Line 104: / Line 113: @@
 :{{Par2|pc_range|bool|false}}
-::When set to true, this will make all internal RGB&rarr;YUV &rarr;RGB conversions assume that luma range is 0-255 instead of default 16-235 range. It is only recommended to change this setting if you know what you are doing. See [[#RGB considerations|RGB considerations]] below.
+::When set to true, this will make all internal RGB&rarr;YUV &rarr;RGB conversions assume that YUV sources are full-range instead of the default TV range. It is only recommended to change this setting if you know what you are doing. See [[#RGB considerations|RGB considerations]] below.
 </div>
@@ Line 113: / Line 126: @@
 * When overlaying an RGB clip using the ''add'', ''subtract'' or ''multiply'' modes, the range of the overlay clip is better, if it is 0-255, since this will enable completely dark areas not to influence the result (instead of adding 16 to every value).
 * When NOT doing a colorspace conversion on output. If the output colorspace (RGB vs. YUV) is different from the input, the scale will be wrong. If {{FuncArg|pc_range}}=true, and input is RGB, while output is YUY2, the YUY2 will have an invalid range, and not CCIR-601 range.
 ===== ''Outputting RGB'' =====
@@ Line 118: / Line 132: @@
 ===== ''Inputting RGB for mask clip'' =====
-:An RGB {{FuncArg|mask}} clip may behave a bit oddly if it contains color information. If you use a greyscale mask, or if you leave {{FuncArg|greymask}}=true, you will get the result you would expect. Note that {{FuncArg|mask}} values are never scaled, so it will automatically be in 0-255 range, directly copied from the RGB values.
+:An RGB {{FuncArg|mask}} clip may behave a bit oddly if it contains color information. If you use a greyscale mask, or if you leave {{FuncArg|greymask}}=true, you will get the result you would expect. Note that {{FuncArg|mask}} values are never scaled, so it will automatically be in full-range, directly copied from the RGB values.
 ===== ''Using RGB32 alpha channel'' =====
@@ Line 296: / Line 310: @@
 | Initial Release.
 |}
+</div>
 [[Category:Internal filters]]
 [[Category:Layering]]

@@ Line 37: / Line 37: @@
 :{{Par2|mode|string|"blend"}}
 ::Defines how your {{FuncArg|overlay}} should be blended with your base image.
-::{| class="wikitable" style="max-width:60em!important"
+<div style="max-width:56em;margin:0 0 0 3.5em" >
 |-
-| '''Mode'''
+|style="vertical-align:top"| Blend
-| '''Description'''
+|[[File:Layer-base-Lena.png]] [[File:Layer-over-grad.png]]
 |-
-| Blend
+|style="vertical-align:top"| Add
-| The default mode: ordinary blending in proportion to {{FuncArg|opacity}}.
+|style="vertical-align:top"| [[File:Overlay-example-add.png]]
 |-
-| Add
+|style="vertical-align:top"| Subtract
-| Add the overlay video to the base video, making the video brighter. To make this as comparable to RGB, overbright luma areas are influencing chroma and making them more white.{{Clarify}}
+|style="vertical-align:top"| [[File:Overlay-example-subtract.png]]
 |-
-| Subtract
+|style="vertical-align:top"| Multiply
-| The opposite of ''Add''. Make the video darker.
+|style="vertical-align:top"| [[File:Overlay-example-multiply.png]]
 |-
-| Multiply
+|style="vertical-align:top"| Chroma
-| Darkens the image in proportion to {{FuncArg|overlay}} lightness.
+|style="vertical-align:top"| [[File:Overlay-example-chroma.png]]
 |-
-| Chroma
+|style="vertical-align:top"| Luma
-| Overlay only the color information of the overlay clip on to the base image.
+|style="vertical-align:top"| [[File:Overlay-example-luma.png]]
 |-
-| Luma
+|style="vertical-align:top"| Lighten
-| Overlay only the luminosity information of the overlay clip on to the base image.
+|style="vertical-align:top"| [[File:Overlay-example-lighten.png]]
 |-
-| Lighten
+|style="vertical-align:top"| Darken
-| Use {{FuncArg|overlay}} only where it is lighter than the base image.
+|style="vertical-align:top"| [[File:Overlay-example-darken.png]]
 |-
-| Darken
+|style="vertical-align:top"| SoftLight
-| Use {{FuncArg|overlay}} only where it is darker than the base image.
+|style="vertical-align:top"| [[File:Overlay-example-softlight.png]]
 |-
-| SoftLight
+|style="vertical-align:top"| HardLight
-| Lighten or darken the base clip, based on {{FuncArg|overlay}} luma. Where {{FuncArg|overlay}} luma is darker than 128, the output will be darker. Where {{FuncArg|overlay}} luma is lighter than 128, the output will be lighter. This is useful for adding shadows to an image. Pure black or white in the {{FuncArg|overlay}} produces a distinctly darker or lighter area, but unlike ''HardLight'', does not result in pure black or white output.
+|style="vertical-align:top"| [[File:Overlay-example-hardlight.png]]
 |-
-| HardLight
+|style="vertical-align:top"| Difference
-| Lighten or darken the base clip, based on {{FuncArg|overlay}} luma. Where {{FuncArg|overlay}} luma is darker than 128, the output will be darker. Where {{FuncArg|overlay}} luma is lighter than 128, the output will be lighter. Pure black or white in the {{FuncArg|overlay}} results in pure black or white in the output.
+|style="vertical-align:top"| [[File:Overlay-example-difference.png]]
 |-
-| Difference
+|style="vertical-align:top"| Exclusion
-| Display the difference between the clip and the overlay. Note that like [[Subtract]], a difference of zero is displayed as grey, but with luma=128 instead of 126. If you want the pure difference, use mode="Subtract" or add [[ColorYUV]](off_y=-128).
+|style="vertical-align:top"| [[File:Overlay-example-exclusion.png]]
-|-
+|style="vertical-align:top"| Invert the image based on the luminosity of the overlay image. Blending with white inverts the base color values; blending with black produces no change.
-| Exclusion
 | Invert the image based on the luminosity of the overlay image. Blending with white inverts the base color values; blending with black produces no change.
 |}

← Older revision		Revision as of 00:16, 14 February 2016
Line 246:		Line 246:

	thus the dot moves in the following way: (20,20)→(250,350)→(400,40). It's also possible to do this using script variables in place of text files, with [[Animate]].		thus the dot moves in the following way: (20,20)→(250,350)→(400,40). It's also possible to do this using script variables in place of text files, with [[Animate]].
		+	</div>
		+
		+
		+	== See also ==
		+	<div style="max-width:62em" >
		+	* [[Merge]], [[MergeChroma]] and [[MergeLuma]] – simple blending in any colorspace.
		+	<div {{ListItemContinue}} >
		+	Base and overlay colorspaces must match.
		+	</div>
		+	* [[Layer]], which supports YUY2 and RGB32 without internal conversion. Supports RGB32 alpha-channel masking.
		+	<div {{ListItemContinue}} >
		+	Base and overlay colorspaces must match.
		+	</div>
		+	* [[Uu_mt_blend\|uu_mt_blend]], which does not support masking, but supports YV12, RGB24 and RGB32 blending without internal conversion.
		+	<div {{ListItemContinue}} >
		+	Base and overlay colorspaces must match. Wide selection of blend modes. Most blend modes work best in RGB.
		+	</div>
		+	* [[Fusion]], which uses image pyramids to blend clips together; most often used in the creation of [[Wikipedia:High-dynamic-range_imaging\|HDR]] images and image stitching.
		+
		+	* and more – see [[External_filters#Averaging.2FLayering.2FMasking\|External Filters: Averaging/Layering/Masking]]
	</div>		</div>

@@ Line 4: / Line 4: @@
 *Input clips ({{FuncArg|base}}, {{FuncArg|overlay}} and {{FuncArg|mask}}) are converted to [[YV24]] internally. The output is re-converted to the input colorspace (or to the {{FuncArg|output}} colorspace, if specified).
-*In general all clips are treated as 0&ndash;255 values. This means that numbers will not be clipped at CCIR-601 range; you may use [[Limiter]] for this task afterwards. If your {{FuncArg|mask}} is 16&ndash;235, convert it to 0&ndash;255 &ndash; for example, with [[ColorYUV]](levels="TV->PC") &ndash; or the mask will never be fully opaque.
+*In general all clips are treated as 0-255 values. This means that numbers will not be clipped at CCIR-601 range; you may use [[Limiter]] for this task afterwards. If your {{FuncArg|mask}} is 16-235, convert it to 0-255 &ndash; for example, with [[ColorYUV]](levels="TV->PC") &ndash; or the mask will never be fully opaque.
 *It is not recommended to do overlays on [[Interlaced_fieldbased|interlaced]] material, unless you know what you are doing.
@@ Line 29: / Line 29: @@
 ::Define the placement of the overlay image on the base clip, in pixels. Can be positive or negative.
-:{{Par2|mask|clip|}}
+:{{Par2|mask|clip|(full opacity)}}
-::Optional transparency mask. Must be the same size as {{FuncArg|overlay}}. Where {{FuncArg|mask}} is darker, {{FuncArg|overlay}} will be more transparent. By default only the greyscale (luma) components are used, but this can be overridden with {{FuncArg|greymask}}=false.
+::Optional ''transparency mask''. Must be the same size as {{FuncArg|overlay}}. Where {{FuncArg|mask}} is darker, {{FuncArg|overlay}} will be more transparent. Must be 0-255 range. By default only the greyscale (luma) components are used, but this can be overridden with {{FuncArg|greymask}}=false.
-::''There is no default, but not specifying is equivalent to supplying a 255 clip.''
 :{{Par2|opacity|float|1.0}}
@@ Line 90: / Line 89: @@
 :{{Par2|pc_range|bool|false}}
-::When set to true, this will make all internal RGB&rarr;YUV &rarr;RGB conversions assume that luma range is 0&ndash;255 instead of default 16&ndash;235 range. It is only recommended to change this setting if you know what you are doing. See [[#RGB considerations|RGB considerations]] below.
+::When set to true, this will make all internal RGB&rarr;YUV &rarr;RGB conversions assume that luma range is 0-255 instead of default 16-235 range. It is only recommended to change this setting if you know what you are doing. See [[#RGB considerations|RGB considerations]] below.
 </div>
@@ Line 96: / Line 95: @@
 == RGB considerations ==
 <div style="max-width:62em" >
-[[RGB]] inputs are accepted. However, as '''Overlay''' converts internally to [[YV24]], this will lead to an RGB&rarr;YUV conversion. There are two modes for this conversion, toggled by the {{FuncArg|pc_range}} parameter. This parameter will extend the YUV range from 16&ndash;235 (this is the range used by all avisynth converters) to 0&ndash;255. There are some cases where enabling {{FuncArg|pc_range}} is a good idea:
+[[RGB]] inputs are accepted. However, as '''Overlay''' converts internally to [[YV24]], this will lead to an RGB&rarr;YUV conversion. There are two modes for this conversion, toggled by the {{FuncArg|pc_range}} parameter. This parameter will extend the YUV range from 16-235 (this is the range used by all avisynth converters) to 0-255. There are some cases where enabling {{FuncArg|pc_range}} is a good idea:
-* When overlaying an RGB clip using the ''add'', ''subtract'' or ''multiply'' modes, the range of the overlay clip is better, if it is 0&ndash;255, since this will enable completely dark areas not to influence the result (instead of adding 16 to every value).
+* When overlaying an RGB clip using the ''add'', ''subtract'' or ''multiply'' modes, the range of the overlay clip is better, if it is 0-255, since this will enable completely dark areas not to influence the result (instead of adding 16 to every value).
 * When NOT doing a colorspace conversion on output. If the output colorspace (RGB vs. YUV) is different from the input, the scale will be wrong. If {{FuncArg|pc_range}}=true, and input is RGB, while output is YUY2, the YUY2 will have an invalid range, and not CCIR-601 range.
@@ Line 104: / Line 103: @@
 ===== ''Inputting RGB for mask clip'' =====
-:An RGB {{FuncArg|mask}} clip may behave a bit oddly if it contains color information. If you use a greyscale mask, or if you leave {{FuncArg|greymask}}=true, you will get the result you would expect. Note that {{FuncArg|mask}} values are never scaled, so it will automatically be in 0&ndash;255 range, directly copied from the RGB values.
+:An RGB {{FuncArg|mask}} clip may behave a bit oddly if it contains color information. If you use a greyscale mask, or if you leave {{FuncArg|greymask}}=true, you will get the result you would expect. Note that {{FuncArg|mask}} values are never scaled, so it will automatically be in 0-255 range, directly copied from the RGB values.
 ===== ''Using RGB32 alpha channel'' =====
-:'''Overlay''' will never use the alpha channel given in an [[RGB32]] clip. If you want to extract the alpha channel from an RGB32 clip you can use the [[ShowAlpha]] command &mdash; for example, <code>Overlay(kitten, mask=kitten.ShowAlpha)</code>. For maintaining maximum quality it is recommended to extract the alpha as RGB.
+:'''Overlay''' ignores the ''alpha'' (transparency) channel in an [[RGB32]] clip. If you want the alpha, you can use something like <code>Overlay(kitten, mask=kitten.[[ShowAlpha]]("RGB32"))</code>. For maximum quality, it is recommended to extract the alpha as RGB.
 ===== ''Repeated overlays on RGB base clip'' =====
@@ Line 116: / Line 115: @@
 == Conditional Variables ==
 <div style="max-width:62em" >
-The global variables '''OL_opacity_offset''', '''OL_x_offset''' and '''OL_y_offset''' are evaluated for each frame. The values may be set using [[FrameEvaluate]], or they may be read from a file using [[ConditionalReader]] &ndash; see example [[#ConditionalReader|below]].
+The global variables '''ol_opacity_offset''', '''ol_x_offset''' and '''ol_y_offset''' are evaluated for each frame. The values may be set using [[FrameEvaluate]], or they may be read from a file using [[ConditionalReader]] &ndash; see example [[#ConditionalReader|below]].
 These values, after evaluation, will be added to the relevant filter parameters &mdash; for example, if you specify {{FuncArg|x}}=100 as a filter parameter, and '''ol_x_offset'''=50, the {{FuncArg|overlay}} clip will be positioned at x=150. This behaviour can be disabled by using {{FuncArg|ignore_conditional}}=true.
@@ Line 192: / Line 191: @@
 |}
-A tolerance of 60 is used here because the blue is not entirely uniform. Near the black rectangles the blue is given by R23 G22 B124 &ndash; probably due to the compression artifacts of '''blue.jpg'''.
+A tolerance of 60 is used here because the blue is not entirely uniform. Near the black rectangles the blue is given by R=23,G=22,B=124 &ndash; probably due to the compression artifacts of '''blue.jpg'''.

Overlay - Revision history

Pinterf: Update for Avisynth+

Raffriff42: tweak appearance

Raffriff42: tweak appearance

Raffriff42: use Template:AvsPluscon for consistency

Raffriff42: note AVS+ differences *** WIP ***

Raffriff42: small example image for each blend mode

Raffriff42: /* See also */ added

Raffriff42: one more touch-up

Raffriff42: one more touch-up

Raffriff42: typo

Raffriff42: note AVS+ differences * WIP *