Shadows/Highlights - Revision history

DrSlony at 21:40, 9 December 2019

2019-12-09T21:40:37Z

← Older revision		Revision as of 21:40, 9 December 2019
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			<div class="pagetitle">Shadows / Highlights</div>

	== Introduction ==		== Introduction ==

DrSlony at 12:31, 17 December 2018

2018-12-17T12:31:32Z

← Older revision		Revision as of 12:31, 17 December 2018
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	~~Use this tool to raise the shadows or darken the highlights of an image.~~		== Introduction ==

	~~== Sharp Mask ==~~		Use this tool to brighten the shadows or darken the highlights of an image.
	~~<gallery caption="Shadows/Highlights 'Sharp mask' effect" style="clear: both" perrow=3 mode="packed">~~
	~~File:Sh_sm_1.jpg\|The source~~ image.
	~~File:Sh_sm_2.jpg\|"Sharp mask" turned off.~~
	~~File:Sh_sm_3.jpg\|"Sharp mask" turned on.~~
	~~</gallery>~~

	~~In order~~ to ~~separate the dark areas from~~ the ~~light ones,~~ a ~~lightness mask~~ (~~invisible~~ to the ~~user) is created~~. ~~There are two algorithms for doing this; one blurs~~ the image, ~~while~~ the ~~other retains sharp edges between light and dark zones. Neither one is "better"~~, ~~both have their own merits. The soft mask approach can lead~~ to ~~halos, but it is quick. The sharp mask is slow, but it doesn't cause halos, though it can cause edge artifacts at close inspection~~.		This tool has received a new engine in RawTherapee 5.5, it now uses an edge-aware [https://arxiv.org/abs/1505.00996 fast guided filter] to prevent halos and operates by default in RGB space to preserve saturation.

			== Usage ==

			Use it in moderation to preserve a natural look. If the photographed scene has a high dynamic range (very deep shadows and very bright highlights) then use the [[Dynamic Range Compression]] tool to compress the dynamic range to a more manageable level, and then optionally use this Shadows/Highlights tool on top of that.

			== Interface ==

			=== Color Space ===

			Adjusting shadows and highlights in the RGB space preserves image saturation which usually looks more natural than working in Lab* space which tends to desaturate affected areas. However, in some cases working in RGB space may oversaturate the shadows, in which case you should switch to Lab* space.

			=== Shadows ===

	~~== Shadows ==~~
	Allows you to brighten the darkest parts of the image		Allows you to brighten the darkest parts of the image

	== Highlights ==		=== Highlights ===

	Allows you to darken the brightest parts of the image.		Allows you to darken the brightest parts of the image.

	== Tonal Width ==		=== Tonal Width ===

	Shadows/Highlights Tonal Width allows you to control how bright an area must be for it to be affected by the highlights slider, and how dark an area must be for it to be affected by the shadows slider. Though the underlying math is a bit more complicated, think of a histogram - the highlights tonal width specifies the range of tones from the white end of the histogram which the highlights slider will affect, and the shadows tonal width specifies the range of tones from the black end of the histogram which the shadows slider will affect. The higher the tonal width value, the more tones are affected.		Shadows/Highlights Tonal Width allows you to control how bright an area must be for it to be affected by the highlights slider, and how dark an area must be for it to be affected by the shadows slider. Though the underlying math is a bit more complicated, think of a histogram - the highlights tonal width specifies the range of tones from the white end of the histogram which the highlights slider will affect, and the shadows tonal width specifies the range of tones from the black end of the histogram which the shadows slider will affect. The higher the tonal width value, the more tones are affected.

	== Radius ==		=== Radius ===

	The value of the Radius slider influences the effective area of the Shadows and Highlights sliders.		The value of the Radius slider influences the effective area of the Shadows and Highlights sliders.

DrSlony at 21:55, 7 January 2018

2018-01-07T21:55:57Z

← Older revision		Revision as of 21:55, 7 January 2018
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	== Radius ==		== Radius ==
	The value of the Radius slider influences the ~~Highlights, Shadows and Local Contrast sliders. The~~ effective area of the Highlights ~~and Shadows~~ sliders ~~also increases~~.		The value of the Radius slider influences the effective area of the Shadows and Highlights sliders.

DrSlony at 21:37, 7 January 2018

2018-01-07T21:37:58Z

← Older revision		Revision as of 21:37, 7 January 2018
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	== Sharp Mask ==		== Sharp Mask ==
	<gallery caption="Shadows/Highlights "Sharp mask" effect" style="clear: both">		<gallery caption="Shadows/Highlights 'Sharp mask' effect" style="clear: both" perrow=3 mode="packed">
	File:Sh_sm_1.jpg\|The source image.		File:Sh_sm_1.jpg\|The source image.
	File:Sh_sm_2.jpg\|"Sharp mask" turned off.		File:Sh_sm_2.jpg\|"Sharp mask" turned off.

DrSlony at 21:33, 7 January 2018

2018-01-07T21:33:39Z

← Older revision		Revision as of 21:33, 7 January 2018
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	Use this tool to ~~independently influence~~ the highlights ~~and the shadows~~ of ~~the~~ image.		Use this tool to raise the shadows or darken the highlights of an image.

	== Sharp Mask ==		== Sharp Mask ==
Line 9:		Line 9:

	In order to separate the dark areas from the light ones, a lightness mask (invisible to the user) is created. There are two algorithms for doing this; one blurs the image, while the other retains sharp edges between light and dark zones. Neither one is "better", both have their own merits. The soft mask approach can lead to halos, but it is quick. The sharp mask is slow, but it doesn't cause halos, though it can cause edge artifacts at close inspection.		In order to separate the dark areas from the light ones, a lightness mask (invisible to the user) is created. There are two algorithms for doing this; one blurs the image, while the other retains sharp edges between light and dark zones. Neither one is "better", both have their own merits. The soft mask approach can lead to halos, but it is quick. The sharp mask is slow, but it doesn't cause halos, though it can cause edge artifacts at close inspection.

			== Shadows ==
			Allows you to brighten the darkest parts of the image

	== Highlights ==		== Highlights ==
	~~The Highlights slider makes~~ the brightest parts of the image ~~less bright without touching the darker tones. To make the effect stronger, use higher values. A slider value of 100 will turn the whites light gray.~~		Allows you to darken the brightest parts of the image.

	~~== Tonal Width for Highlights ==~~
	This slider controls the strength of the Highlights slider. Higher values give a stronger effect. A value of 100, combined with Highlights 100, turns the whites into middle gray (you probably won't want that...).

	~~== Shadows ==~~
	~~This slider lifts the shadows and applies an effect that is sometimes called 'fill-light' (or 'fill-flash') in other software. Higher values lighten the shadow areas more~~.

	== Tonal Width ~~for Shadows~~ ==		== Tonal Width ==
	~~This~~ slider ~~controls~~ the ~~strength~~ of the ~~Shadows~~ slider. ~~A maximum~~ value ~~of 100 gives~~ the ~~strongest 'lift shadows' effect~~.		Shadows/Highlights Tonal Width allows you to control how bright an area must be for it to be affected by the highlights slider, and how dark an area must be for it to be affected by the shadows slider. Though the underlying math is a bit more complicated, think of a histogram - the highlights tonal width specifies the range of tones from the white end of the histogram which the highlights slider will affect, and the shadows tonal width specifies the range of tones from the black end of the histogram which the shadows slider will affect. The higher the tonal width value, the more tones are affected.

	== Radius ==		== Radius ==
	The value of the Radius slider influences the Highlights, Shadows and Local Contrast sliders~~. The larger the radius, the stronger the effect of local contrast~~. The effective area of the Highlights and Shadows sliders also increases.		The value of the Radius slider influences the Highlights, Shadows and Local Contrast sliders. The effective area of the Highlights and Shadows sliders also increases.

	~~If you are bored, set the first four sliders to 100 and play with Local Contrast to transform your favorite raw processor into a cheap effect machine!~~

DrSlony: Removed Local Contrast section because the tool was removed, #4247

2018-01-07T19:59:52Z

Removed Local Contrast section because the tool was removed, #4247

← Older revision		Revision as of 19:59, 7 January 2018
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	== Tonal Width for Shadows ==		== Tonal Width for Shadows ==
	This slider controls the strength of the Shadows slider. A maximum value of 100 gives the strongest 'lift shadows' effect.		This slider controls the strength of the Shadows slider. A maximum value of 100 gives the strongest 'lift shadows' effect.

	~~== Local Contrast ==~~
	Local Contrast is an adaptive contrast adjustment depending on contrast within a specified area. It increases contrast in small areas while keeping the global contrast (which can be set with the contrast sliders in Exposure or Lab). The resulting image will look more 'three-dimensional'. This feature is very useful when you have a foggy image or took your picture through a window. The effect is somewhat similar to an unsharp mask with a high radius and a small value. A setting between 5 and 20 works best for most shots.

	== Radius ==		== Radius ==

DrSlony: Created page with "Use this tool to independently influence the highlights and the shadows of the image. == Sharp Mask ==
2014-01-16T16:10:18Z

Created page with "Use this tool to independently influence the highlights and the shadows of the image. == Sharp Mask == <gallery caption="Shadows/Highlights "Sharp mask" effect" style="clear:..."

New page
Use this tool to independently influence the highlights and the shadows of the image.

== Sharp Mask ==
<gallery caption="Shadows/Highlights "Sharp mask" effect" style="clear: both">
File:Sh_sm_1.jpg|The source image.
File:Sh_sm_2.jpg|"Sharp mask" turned off.
File:Sh_sm_3.jpg|"Sharp mask" turned on.
</gallery>

In order to separate the dark areas from the light ones, a lightness mask (invisible to the user) is created. There are two algorithms for doing this; one blurs the image, while the other retains sharp edges between light and dark zones. Neither one is "better", both have their own merits. The soft mask approach can lead to halos, but it is quick. The sharp mask is slow, but it doesn't cause halos, though it can cause edge artifacts at close inspection.

== Highlights ==
The Highlights slider makes the brightest parts of the image less bright without touching the darker tones. To make the effect stronger, use higher values. A slider value of 100 will turn the whites light gray.

== Tonal Width for Highlights ==
This slider controls the strength of the Highlights slider. Higher values give a stronger effect. A value of 100, combined with Highlights 100, turns the whites into middle gray (you probably won't want that...).

== Shadows ==
This slider lifts the shadows and applies an effect that is sometimes called 'fill-light' (or 'fill-flash') in other software. Higher values lighten the shadow areas more.

== Tonal Width for Shadows ==
This slider controls the strength of the Shadows slider. A maximum value of 100 gives the strongest 'lift shadows' effect.

== Local Contrast ==
Local Contrast is an adaptive contrast adjustment depending on contrast within a specified area. It increases contrast in small areas while keeping the global contrast (which can be set with the contrast sliders in Exposure or Lab). The resulting image will look more 'three-dimensional'. This feature is very useful when you have a foggy image or took your picture through a window. The effect is somewhat similar to an unsharp mask with a high radius and a small value. A setting between 5 and 20 works best for most shots.

== Radius ==
The value of the Radius slider influences the Highlights, Shadows and Local Contrast sliders. The larger the radius, the stronger the effect of local contrast. The effective area of the Highlights and Shadows sliders also increases.

If you are bored, set the first four sliders to 100 and play with Local Contrast to transform your favorite raw processor into a cheap effect machine!