Wavelet Levels - Revision history

DrSlony: Updated dead link to Guided Image Filtering

2023-04-06T14:22:05Z

Updated dead link to Guided Image Filtering

← Older revision		Revision as of 14:22, 6 April 2023
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	Finally, under the ''Soft Radius'' you have the option to ''Show wavelet 'mask''', which allows you to see which details will be enhanced:		Finally, under the ''Soft Radius'' you have the option to ''Show wavelet 'mask''', which allows you to see which details will be enhanced:
	* in the case of the ''Sharp Mask'', an image will be displayed with a black background and the details will be highlighted in white (if you have ever seen an ''Unsharp Mask'', you will find it similar).		* in the case of the ''Sharp Mask'', an image will be displayed with a black background and the details will be highlighted in white (if you have ever seen an ''Unsharp Mask'', you will find it similar).
	* however, with the ''Clarity'' option, the mask is different and is based on [~~http~~://kaiminghe.~~com~~/eccv10/ Guided Image Filtering] and is less intuitive. In general, the white areas (although blurred) are the ones that will be highlighted.		* however, with the ''Clarity'' option, the mask is different and is based on [https://kaiminghe.github.io/eccv10/index.html Guided Image Filtering] and is less intuitive. In general, the white areas (although blurred) are the ones that will be highlighted.

	== Residual Image module ==		== Residual Image module ==
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	The last option in this group is the ''Radius Shadows/Highlights''. Note: this slider will be hidden when the ''Algorithm using negative values'' option is activated.		The last option in this group is the ''Radius Shadows/Highlights''. Note: this slider will be hidden when the ''Algorithm using negative values'' option is activated.

	This slider applies [~~http~~://kaiminghe.~~com~~/eccv10/ Guided Image Filtering] that attenuates the transitions in the shadows and the highlights caused by the previous adjustments. It controls the area of influence of adjustments made in the shadows and highlights to improve the way they are integrated into the rest of the image.		This slider applies [https://kaiminghe.github.io/eccv10/index.html Guided Image Filtering] that attenuates the transitions in the shadows and the highlights caused by the previous adjustments. It controls the area of influence of adjustments made in the shadows and highlights to improve the way they are integrated into the rest of the image.

	You can adjust the shadows and highlights to:		You can adjust the shadows and highlights to:

Jdc at 12:56, 22 November 2022

2022-11-22T12:56:37Z

← Older revision		Revision as of 12:56, 22 November 2022
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	==== The process levels ====		==== The process levels ====

	~~{{:waveletnew}}~~

	In the '''''Process''''' list you can select:		In the '''''Process''''' list you can select:
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	=== The attenuation curve ===		=== The attenuation curve ===

	~~{{:waveletnew}}~~

	As discussed in an earlier chapter, the wavelets tool calculates the mean and standard deviation for each decomposition level and will use these values in all of the modules.		As discussed in an earlier chapter, the wavelets tool calculates the mean and standard deviation for each decomposition level and will use these values in all of the modules.
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	=== Attenuation and selectivity in contrast changes ===		=== Attenuation and selectivity in contrast changes ===

	~~{{:waveletnew}}~~

	There are 3 sliders that allow you to adjust the curve for each level, as explained in [[#Analysis_of_the_contrasts_in_each_level \| Analysis of the contrasts in each level]]:		There are 3 sliders that allow you to adjust the curve for each level, as explained in [[#Analysis_of_the_contrasts_in_each_level \| Analysis of the contrasts in each level]]:
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	=== Apply To ===		=== Apply To ===

	~~{{:waveletnew}}~~

	This control block allows you to decide whether changes in contrast in individual levels apply to all the details or only to those details with pixels that are within a given range of [https://en.wikipedia.org/wiki/Luminance luminance]. This allows you, for example, to increase the contrast of fine details with high luminance and reduce the contrast of larger details with low luminance.		This control block allows you to decide whether changes in contrast in individual levels apply to all the details or only to those details with pixels that are within a given range of [https://en.wikipedia.org/wiki/Luminance luminance]. This allows you, for example, to increase the contrast of fine details with high luminance and reduce the contrast of larger details with low luminance.
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	=== Excluded Colors ===		=== Excluded Colors ===

	~~{{:waveletnew}}~~

	The '''''Excluded Colors''''' graph is based on the color distribution of the chromatic coordinates used for the Lab* color space: the horizontal axis represents the a* component (going from green to red) and the vertical axis represents the b* component (going from blue to yellow).		The '''''Excluded Colors''''' graph is based on the color distribution of the chromatic coordinates used for the Lab* color space: the horizontal axis represents the a* component (going from green to red) and the vertical axis represents the b* component (going from blue to yellow).
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	== Blur levels module ==		== Blur levels module ==

	~~{{:waveletnew}}~~

	This module allows you to selectively blur («defocus») the details of selected levels. The result is stronger in the higher levels (from ''level 7'' upwards) and is especially useful in astrophotography.		This module allows you to selectively blur («defocus») the details of selected levels. The result is stronger in the higher levels (from ''level 7'' upwards) and is especially useful in astrophotography.
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	== Sharp-mask and Clarity module ==		== Sharp-mask and Clarity module ==

	~~{{:waveletnew}}~~

	The ''Sharp mask'' feature is a new way of enhancing sharpness alongside the other methods available in RawTherapee (i.e. ''Unsharp Mask'', ''Deconvolution'' and ''Wavelet Levels Edge Sharpness''). It can be used in conjunction with them or on its own.		The ''Sharp mask'' feature is a new way of enhancing sharpness alongside the other methods available in RawTherapee (i.e. ''Unsharp Mask'', ''Deconvolution'' and ''Wavelet Levels Edge Sharpness''). It can be used in conjunction with them or on its own.
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	==== Compression Method: Tone Mapping ====		==== Compression Method: Tone Mapping ====

	~~{{:waveletnew}}~~

	In this case the compression method used is the same as the [[Tone_Mapping\|Tone Mapping]] tool and its sliders act in the same way. It acts only in the residual image and will make in-depth modifications to the contrast (in the same way as Tone Mapping). Because of this, you will most likely have to readjust any changes in the levels as well to ensure that the overall image remains balanced.		In this case the compression method used is the same as the [[Tone_Mapping\|Tone Mapping]] tool and its sliders act in the same way. It acts only in the residual image and will make in-depth modifications to the contrast (in the same way as Tone Mapping). Because of this, you will most likely have to readjust any changes in the levels as well to ensure that the overall image remains balanced.
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	=== Blur ===		=== Blur ===

	~~{{:waveletnew}}~~

	This group of two sliders may seem trivial, but it can be an interesting aid to improve the [https://en.wikipedia.org/wiki/Bokeh bokeh] of the image, by blurring the luminance of the residual image ('''''Blur Luminance''''') and its color component ('''''Blur Chroma''''').		This group of two sliders may seem trivial, but it can be an interesting aid to improve the [https://en.wikipedia.org/wiki/Bokeh bokeh] of the image, by blurring the luminance of the residual image ('''''Blur Luminance''''') and its color component ('''''Blur Chroma''''').

Jdc: /* Shadows/highlights of the residual image */

2022-11-22T12:53:39Z

Shadows/highlights of the residual image

← Older revision		Revision as of 12:53, 22 November 2022
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	=== Shadows/highlights of the residual image ===		=== Shadows/highlights of the residual image ===

	~~{{:waveletnew}}~~

	~~This group of controls starts with an option that allows you to assign negative values to the sliders ('''''Algorithm using negative values''''').~~

	~~When you activate this option, moving~~ the sliders for Shadows and Highlights to the right increases the luminance of those areas; to the left (negative values), it reduces it. This can be used to further darken the shadows and increase the brightness of the highlights:
			Moving the sliders for Shadows and Highlights to the right increases the luminance of those areas; to the left (negative values), it reduces it. This can be used to further darken the shadows and increase the brightness of the highlights:

	<div><ul class="leftalign">		<div><ul class="leftalign">
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	To help decide which threshold values to use you can check the luminance values by hovering the mouse over the relevant area in the image and reading off the L* luminance value in the Navigator panel. These values correspond directly to the scale used for the threshold sliders.		To help decide which threshold values to use you can check the luminance values by hovering the mouse over the relevant area in the image and reading off the L* luminance value in the Navigator panel. These values correspond directly to the scale used for the threshold sliders.

	If ~~you disable the option ''Algorithm using negative values'', the~~ sliders for shadows and highlights ~~can only~~ have positive values, so you can only ''recover'' the shadows (lightening them) or highlights (darkening them). The result is similar to the [[Shadows/Highlights]] tool in the Exposure tab. However, note that this tool does not have the ability to [[Exposure#Highlight_Reconstruction\|Reconstruct Highlights]].		If sliders for shadows and highlights have positive values, you can only ''recover'' the shadows (lightening them) or highlights (darkening them). The result is similar to the [[Shadows/Highlights]] tool in the Exposure tab. However, note that this tool does not have the ability to [[Exposure#Highlight_Reconstruction\|Reconstruct Highlights]].

	~~The following summarizes the module behavior depending on whether the option is activated or not:~~		* negative values have a strong impact on the residual image
	* if the option ''Algorithm using negative values'' is ''disabled'':		* highlights are darkened if negative values are used
	** negative values in the sliders are ignored (treated as if they were equal to ''0'')		* highlights are lightened if positive values are used
	** moving the highlights slider to the right darkens the highlights		* shadows are darkened if negative values are used
	** moving the shadows slider to the right lightens the shadows		* shadows become lighter if positive values are used
	* if, on the contrary, the option ''Algorithm using negative values'' is ''activated'':
	** negative values have a strong impact on the residual image
	** highlights are darkened if negative values are used
	** highlights are lightened if positive values are used
	** shadows are darkened if negative values are used
	** shadows become lighter if positive values are used

	<div><ul class="leftalign">		<div><ul class="leftalign">
	<li class="RP3inarow"> [[File:wavelets_residual_SHneg_original.jpg\|thumb\|none\|400px\|Original image.]] </li>		<li class="RP3inarow"> [[File:wavelets_residual_SHneg_original.jpg\|thumb\|none\|400px\|Original image.]] </li>
	<li class="RP3inarow"> [[File:wavelets_residual_SHneg_old.jpg\|thumb\|none\|400px\|Residual image using negative values in shadows and positive values in highlights]] </li>		<li class="RP3inarow"> [[File:wavelets_residual_SHneg_old.jpg\|thumb\|none\|400px\|Residual image using negative values in shadows and positive values in highlights]] </li>
	<li class="RP3inarow"> [[File:wavelets_residual_SHneg_new.jpg\|thumb\|none\|400px\|Residual image using the same values as before, but ~~with the option ''Algorithm using~~ negative values~~'' turned off~~.]] </li>		<li class="RP3inarow"> [[File:wavelets_residual_SHneg_new.jpg\|thumb\|none\|400px\|Residual image using the same values as before, but without negative values.]] </li>
	</ul></div>		</ul></div>

	~~In the three previous images you can see a dramatic change. You will notice also that when the option is off, the negative values of the shadows are ignored and the highlights are darkened.~~

	The last option in this group is the ''Radius Shadows/Highlights''. Note: this slider will be hidden when the ''Algorithm using negative values'' option is activated.		The last option in this group is the ''Radius Shadows/Highlights''. Note: this slider will be hidden when the ''Algorithm using negative values'' option is activated.

XavAL: Main image reduced

2020-10-12T17:35:34Z

Main image reduced

← Older revision		Revision as of 17:35, 12 October 2020
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	<div class="pagetitle">Wavelet Levels</div>		<div class="pagetitle">Wavelet Levels</div>

	[[File:Daffodil_split.jpg\|none\|thumb\|~~800px~~\|class=heroed\|A ''before'' (bottom) and ''after'' (top) view of an image processed with Wavelet levels.]]		[[File:Daffodil_split.jpg\|none\|thumb\|700px\|class=heroed\|A ''before'' (bottom) and ''after'' (top) view of an image processed with Wavelet levels.]]

	__TOC__		__TOC__

XavAL: Changing image links to lower size versions

2020-07-07T20:54:39Z

Changing image links to lower size versions

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XavAL: /* What are Wavelets? */

2020-07-06T08:24:13Z

What are Wavelets?

← Older revision		Revision as of 08:24, 6 July 2020
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	The wavelets term was introduced in the early 1980s by French physicists Jean Morlet and Alex Grossman: they used the French word ''ondelette'', which means ''small wave''. Later, this word was adapted to English changing ''onde'' by ''wave'', leading to ''wavelet''.		The wavelets term was introduced in the early 1980s by French physicists Jean Morlet and Alex Grossman: they used the French word ''ondelette'', which means ''small wave''. Later, this word was adapted to English changing ''onde'' by ''wave'', leading to ''wavelet''.

	The ''Wavelet Transform'', which is similar to a ''Fourier Transform'', ~~<span style="color: red;">~~represents data as combinations of known and predefined waves (the frequencies), so that the result is as close as possible to the original data.~~</span>~~ Broadly speaking, the main difference for two-dimensional images is that in the Wavelet Transform the data being analyzed is represented as the frequencies present at the pixel level of the image, whereas in the standard Fourier Transform the data represents the frequencies present in the full image. Therefore, using wavelets offers more precision when analyzing the data.   <span style="font-size: 0.7em; font-style: italic;">[Obviously this is a very simplistic explanation: mathematicians would surely have a lot to say here...]</span>		The ''Wavelet Transform'', which is similar to a ''Fourier Transform'', represents data as combinations of known and predefined waves (the frequencies), so that the result is as close as possible to the original data. Broadly speaking, the main difference for two-dimensional images is that in the Wavelet Transform the data being analyzed is represented as the frequencies present at the pixel level of the image, whereas in the standard Fourier Transform the data represents the frequencies present in the full image. Therefore, using wavelets offers more precision when analyzing the data.   <span style="font-size: 0.7em; font-style: italic;">[Obviously this is a very simplistic explanation: mathematicians would surely have a lot to say here...]</span>

	[[File:Wavelet_daubechies20.png\|thumb\|400px\|Graphic rendering of a Daubechies wavelet\|link=https://en.wikipedia.org/wiki/Daubechies_wavelet]]RawTherapee uses wavelets in various tools, and in this one in particular it uses the [https://en.wikipedia.org/wiki/Daubechies_wavelet Daubechies] wavelet, to decompose the elements of the image into the components of the [https://en.wikipedia.org/wiki/CIELAB_color_space Lab* color space] (''L'', ''a'' and ''b*'').		[[File:Wavelet_daubechies20.png\|thumb\|400px\|Graphic rendering of a Daubechies wavelet\|link=https://en.wikipedia.org/wiki/Daubechies_wavelet]]RawTherapee uses wavelets in various tools, and in this one in particular it uses the [https://en.wikipedia.org/wiki/Daubechies_wavelet Daubechies] wavelet, to decompose the elements of the image into the components of the [https://en.wikipedia.org/wiki/CIELAB_color_space Lab* color space] (''L'', ''a'' and ''b*'').

XavAL: Added updated documentation

2020-07-06T08:23:16Z

Added updated documentation

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Thanatomanic: Redirected page to Wavelets

2018-11-24T12:03:26Z

Redirected page to Wavelets

← Older revision		Revision as of 12:03, 24 November 2018
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	#REDIRECT [[~~Wavelet~~]]		#REDIRECT [[Wavelets]]

DrSlony: DrSlony moved page Wavelet Levels to Wavelet

2015-06-08T15:27:54Z

DrSlony moved page Wavelet Levels to Wavelet

New page

#REDIRECT [[Wavelet]]