Film Simulation - Revision history

XavAL at 21:36, 9 December 2019

2019-12-09T21:36:31Z

← Older revision		Revision as of 21:36, 9 December 2019
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			<div class="pagetitle">Film Simulation</div>

	[[File:Rt haldclut london.jpg\|900px\|thumb\|The Film Simulation tool can change the look of a photo to match a film stock with a single click.]]		[[File:Rt haldclut london.jpg\|900px\|thumb\|The Film Simulation tool can change the look of a photo to match a film stock with a single click.]]
	The ''Film Simulation'' tool allows you to match the colors of a photo to a reference image with a single click. This tool requires the use of reference images in the HaldCLUT pattern, in either PNG or TIFF format. Each HaldCLUT image corresponds to one "look". Though the look can be based on anything, most of the reference images we ship are based on classic film stock, ergo the tool's name.		The ''Film Simulation'' tool allows you to match the colors of a photo to a reference image with a single click. This tool requires the use of reference images in the HaldCLUT pattern, in either PNG or TIFF format. Each HaldCLUT image corresponds to one "look". Though the look can be based on anything, most of the reference images we ship are based on classic film stock, ergo the tool's name.

DrSlony: /* Make Your Own */ added note on output profile

2018-12-07T08:22:13Z

Make Your Own: added note on output profile

← Older revision		Revision as of 08:22, 7 December 2018
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	Even if your HaldCLUT image contains colors in only 8-bit precision, missing values will be interpolated so that posterization will not occur in your photo. As such, since there is no visual loss of quality, we recommend using the level 12 identity file, or even an 8-level one, and storing your self-made HaldCLUT images in an 8-bit per channel PNG or TIFF file.		Even if your HaldCLUT image contains colors in only 8-bit precision, missing values will be interpolated so that posterization will not occur in your photo. As such, since there is no visual loss of quality, we recommend using the level 12 identity file, or even an 8-level one, and storing your self-made HaldCLUT images in an 8-bit per channel PNG or TIFF file.

			The color profile assigned to the saved HaldCLUT image does not matter. What matters are the pixel values of that image. You may be familiar with the terms "assign color profile" vs "convert to color profile" from GIMP or Photoshop - which color profile is assigned does not matter because it does not alter pixel values, but converting matters because then the pixel values change. When editing the HaldCLUT image in RawTherapee, the choice of [[Color_Management#Output_Profile\|output color profile]] matters because it alters pixel values of the saved image. As the identity image provided by us or generated according to our recipe uses the sRGB primary chromaticities, so you should use RTv2_sRGB or RTv4_sRGB when saving it in order to preserve the colors.

	If you apply this HaldCLUT to a photo in RawTherapee and the photo unexpectedly and unintentionally becomes considerably darker or lighter than it should have, then it's likely that the program which you ran it through did something with the gamma. To remedy, you have to undo what that program did. Try generating your own 12-level HaldCLUT but instead of using the "sRGB" colorspace use just "RGB".		If you apply this HaldCLUT to a photo in RawTherapee and the photo unexpectedly and unintentionally becomes considerably darker or lighter than it should have, then it's likely that the program which you ran it through did something with the gamma. To remedy, you have to undo what that program did. Try generating your own 12-level HaldCLUT but instead of using the "sRGB" colorspace use just "RGB".

DrSlony: Updated links in Credits

2018-10-26T13:26:37Z

Updated links in Credits

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	Credits:		Credits:
	: Pat David - ~~http~~://~~rawtherapee~~.~~com~~/~~forum~~/~~memberlist.php?mode=viewprofile&u=5101~~		: Pat David - https://discuss.pixls.us/u/patdavid
	: Pavlov Dmitry ~~- http://rawtherapee.com/forum/memberlist.php?mode=viewprofile&u=5592~~		: Pavlov Dmitry
	: Michael Ezra - ~~http~~://~~rawtherapee~~.~~com~~/~~forum~~/~~memberlist.php?mode=viewprofile&u=1442~~		: Michael Ezra - https://discuss.pixls.us/u/michaelezra

	Disclaimer:		Disclaimer:
	: The trademarked names which may appear in the filenames of the HaldCLUT images are there for informational purposes only. They serve only to inform the user which film stock the given HaldCLUT image is designed to approximate. As there is no way to convey this information other than by using the trademarked name, we believe this constitutes fair use. Neither the publisher nor the authors are affiliated with or endorsed by the companies that own the trademarks.		: The trademarked names which may appear in the filenames of the HaldCLUT images are there for informational purposes only. They serve only to inform the user which film stock the given HaldCLUT image is designed to approximate. As there is no way to convey this information other than by using the trademarked name, we believe this constitutes fair use. Neither the publisher nor the authors are affiliated with or endorsed by the companies that own the trademarks.

DrSlony: Undo revision 3277 by Andrea.romagnoli (talk)

2018-10-26T13:19:35Z

Undo revision 3277 by Andrea.romagnoli (talk)

← Older revision		Revision as of 13:19, 26 October 2018
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	This archive contains a collection of film simulation HaldCLUTs which you can apply to your photos to instantly match their colors to the film stocks the HaldCLUTs are based on. Unless otherwise noted in the filename, they are all in the sRGB color space, 8-bit per channel, in the PNG image format. Most of them are designed to mimic the results of various film stocks, pushed and pulled in various ways or faded over time.		This archive contains a collection of film simulation HaldCLUTs which you can apply to your photos to instantly match their colors to the film stocks the HaldCLUTs are based on. Unless otherwise noted in the filename, they are all in the sRGB color space, 8-bit per channel, in the PNG image format. Most of them are designed to mimic the results of various film stocks, pushed and pulled in various ways or faded over time.

	The suffixes +, ++, +++, -, --, --- refer to the strength the film was [https://en.wikipedia.org/wiki/Push_processing ~~spinto o tirato~~] during development (non-linear), and "generic" refers to the film type usually sold for rebranding.		The suffixes +, ++, +++, -, --, --- refer to the strength the film was [https://en.wikipedia.org/wiki/Push_processing pushed or pulled] during development (non-linear), and "generic" refers to the film type usually sold for rebranding.

	; [http://rawtherapee.com/shared/HaldCLUT.zip Download] (402MB!)		; [http://rawtherapee.com/shared/HaldCLUT.zip Download] (402MB!)

DrSlony: /* How It Works */

2018-01-24T15:00:25Z

How It Works

← Older revision		Revision as of 15:00, 24 January 2018
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	It should not make a difference what color profile is assigned to a HaldCLUT image. What matters are pixel values, because, remember, a HaldCLUT image is just a matrix of "out" numbers. "Assigning" a color profile does not alter stored pixel values, but "applying" or "converting" does alter stored pixel values, so don't do that. Having said that, the assigned color profile could have an influence, because an image editing program might change the working space depending on the assigned color profile.		It should not make a difference what color profile is assigned to a HaldCLUT image. What matters are pixel values, because, remember, a HaldCLUT image is just a matrix of "out" numbers. "Assigning" a color profile does not alter stored pixel values, but "applying" or "converting" does alter stored pixel values, so don't do that. Having said that, the assigned color profile could have an influence, because an image editing program might change the working space depending on the assigned color profile.

	Color transformation precision depends on the number of levels (columns) in the HaldCLUT image, and on the bit depth used to store the HaldCLUT image. If working on a 32-bit image (or an any-bit image in 32-bit space) using a 12-level HaldCLUT stored in an 8-bit file, for example, the HaldCLUT stores color values with less precision than your image (or your working space) can store. This should not be a problem though, as unknown colors are interpolated from known values, so posterization should not occur. The bit depth of the image format you use to store the HaldCLUT depends on your needs, and is not strictly related to the number of levels the HaldCLUT contains. Photographers will be fine using 8-level HaldCLUTs stored in 8-bit images even when processing higher bit-depth ~~images~~.		Color transformation precision depends on the number of levels (columns) in the HaldCLUT image, and on the bit depth used to store the HaldCLUT image. If working on a 32-bit image (or an any-bit image in 32-bit space) using a 12-level HaldCLUT stored in an 8-bit file, for example, the HaldCLUT stores color values with less precision than your image (or your working space) can store. This should not be a problem though, as unknown colors are interpolated from known values, so posterization should not occur. The bit depth of the image format you use to store the HaldCLUT depends on your needs, and is not strictly related to the number of levels the HaldCLUT contains. Photographers will be fine using 8-level HaldCLUTs stored in 8-bit images even when processing higher bit-depth photographs.

	For more information, refer to Eskil Steenberg's page on HaldCLUT:		For more information, refer to Eskil Steenberg's page on HaldCLUT:

DrSlony: bit depth

2018-01-24T15:00:00Z

bit depth

← Older revision		Revision as of 15:00, 24 January 2018
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	It should not make a difference what color profile is assigned to a HaldCLUT image. What matters are pixel values, because, remember, a HaldCLUT image is just a matrix of "out" numbers. "Assigning" a color profile does not alter stored pixel values, but "applying" or "converting" does alter stored pixel values, so don't do that. Having said that, the assigned color profile could have an influence, because an image editing program might change the working space depending on the assigned color profile.		It should not make a difference what color profile is assigned to a HaldCLUT image. What matters are pixel values, because, remember, a HaldCLUT image is just a matrix of "out" numbers. "Assigning" a color profile does not alter stored pixel values, but "applying" or "converting" does alter stored pixel values, so don't do that. Having said that, the assigned color profile could have an influence, because an image editing program might change the working space depending on the assigned color profile.

	Color transformation precision depends on the number of levels (columns) in the HaldCLUT image, and on the bit depth used to store the HaldCLUT image. If working on a 32-bit image using a 12-bit ~~HaldCLUT~~ for example, the HaldCLUT can store ~~far fewer colors than your photo is capable of showing~~. This should not be a problem though, as unknown colors are interpolated from known values, so ~~there~~ should not ~~be any posterization~~. The bit depth of the image format you use to store the HaldCLUT ~~should be equal~~ to ~~or exceed~~ the number of HaldCLUT ~~levels used - if you store a 12~~-level ~~HaldCLUT~~ in an 8-bit ~~image, you will lose 4 bits of precision, and you will save disk space by using an 8~~-~~level HaldCLUT instead~~.		Color transformation precision depends on the number of levels (columns) in the HaldCLUT image, and on the bit depth used to store the HaldCLUT image. If working on a 32-bit image (or an any-bit image in 32-bit space) using a 12-level HaldCLUT stored in an 8-bit file, for example, the HaldCLUT stores color values with less precision than your image (or your working space) can store. This should not be a problem though, as unknown colors are interpolated from known values, so posterization should not occur. The bit depth of the image format you use to store the HaldCLUT depends on your needs, and is not strictly related to the number of levels the HaldCLUT contains. Photographers will be fine using 8-level HaldCLUTs stored in 8-bit images even when processing higher bit-depth images.

	For more information, refer to Eskil Steenberg's page on HaldCLUT:		For more information, refer to Eskil Steenberg's page on HaldCLUT:

DrSlony: /* Browsing in RawTherapee */ snapshots

2018-01-23T22:45:41Z

Browsing in RawTherapee: snapshots

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	== Browsing in RawTherapee ==		== Browsing in RawTherapee ==
	There are many HaldCLUTs in our collection, and you will probably want to try them all out. You don't need to click on each one with the mouse! There is an easy way of checking them all out, one by one, which requires no mouse work. Assuming you had already set RawTherapee up to point to the HaldCLUT folder and you have a photo open and the Film Simulation tool is ready for use, just select any HaldCLUT image using the combobox, and use the "up" and "down" keys on your keyboard to apply the previous and next one. Using this trick, you can even jump across sub-folders - for example from Black-and-White to Color if using our collection.		There are many HaldCLUTs in our collection, and you will probably want to try them all out. You don't need to click on each one with the mouse! There is an easy way of checking them all out, one by one, which requires no mouse work. Assuming you had already set RawTherapee up to point to the HaldCLUT folder and you have a photo open and the Film Simulation tool is ready for use, just select any HaldCLUT image using the combobox, and use the "up" and "down" keys on your keyboard to apply the previous and next one. Using this trick, you can even jump across sub-folders - for example from Black-and-White to Color if using our collection.

			If you would like to compare the effects of several specific HaldCLUTs, and they are not consecutive in the combobox, an easy way to switch between them is by [[The_Image_Editor_Tab#Snapshots\|taking a snapshot]] after applying each, and then just clicking on the snapshots.

	== RawTherapee Film Simulation Collection ==		== RawTherapee Film Simulation Collection ==

DrSlony at 22:42, 23 January 2018

2018-01-23T22:42:27Z

← Older revision		Revision as of 22:42, 23 January 2018
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	The ''Film Simulation'' tool allows you to match the colors of a photo to a reference image with a single click. This tool requires the use of reference images in the HaldCLUT pattern, in either PNG or TIFF format. Each HaldCLUT image corresponds to one "look". Though the look can be based on anything, most of the reference images we ship are based on classic film stock, ergo the tool's name.		The ''Film Simulation'' tool allows you to match the colors of a photo to a reference image with a single click. This tool requires the use of reference images in the HaldCLUT pattern, in either PNG or TIFF format. Each HaldCLUT image corresponds to one "look". Though the look can be based on anything, most of the reference images we ship are based on classic film stock, ergo the tool's name.

	RawTherapee needs to be able to access these HaldCLUT images in order that you can use the tool. You can download our collection, called the [[Film Simulation#RawTherapee Film Simulation Collection\|RawTherapee Film Simulation Collection]], or you can design your own - more on that later on. The first time you run this tool you will ~~find~~ a message informing you that you need to point RawTherapee to a folder which contains the reference images. Once you have them in a folder, go to "Preferences > Image Processing > Directories" and set "HaldCLUT directory" to the ~~correct~~ folder.		RawTherapee needs to be able to access these HaldCLUT images in order that you can use the tool. You can download our collection, called the [[Film Simulation#RawTherapee Film Simulation Collection\|RawTherapee Film Simulation Collection]], or you can design your own - more on that later on. The first time you run this tool you will see a message informing you that you need to point RawTherapee to a folder which contains the reference images. Once you have them ready in a folder, go to "Preferences > Image Processing > Directories" and set "HaldCLUT directory" to the appropriate folder.

	== Startup time ==		== Startup time ==

DrSlony: Major update

2018-01-23T22:40:40Z

Major update

Show changes

Andrea.romagnoli: /* RawTherapee Film Simulation Collection */

2017-10-21T21:08:23Z

RawTherapee Film Simulation Collection

← Older revision		Revision as of 21:08, 21 October 2017
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	Apply these images to your photos in Hald CLUT-capable software such as RawTherapee to instantly match the colors of your photo to the chosen reference.		Apply these images to your photos in Hald CLUT-capable software such as RawTherapee to instantly match the colors of your photo to the chosen reference.

	The suffixes +, ++, +++, -, --, --- refer to the strength the film was [https://en.wikipedia.org/wiki/Push_processing ~~pushed or pulled~~] during development (non-linear), and "generic" refers to the film type usually sold for rebranding.		The suffixes +, ++, +++, -, --, --- refer to the strength the film was [https://en.wikipedia.org/wiki/Push_processing spinto o tirato] during development (non-linear), and "generic" refers to the film type usually sold for rebranding.

	; [http://rawtherapee.com/shared/HaldCLUT.zip Download] (402MB!)		; [http://rawtherapee.com/shared/HaldCLUT.zip Download] (402MB!)