Film Negative - Revision history

XavAL at 21:09, 9 December 2019

2019-12-09T21:09:47Z

← Older revision		Revision as of 21:09, 9 December 2019
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			<div class="pagetitle">Film Negative</div>

	== Introduction ==		== Introduction ==

DrSlony at 23:55, 11 November 2019

2019-11-11T23:55:09Z

← Older revision		Revision as of 23:55, 11 November 2019
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	Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.		Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.

	The tool supports raw photos of a Bayer of X-Trans sensor. Other raw types and non-raw formats are not supported.		The tool supports raw photos of a Bayer or X-Trans sensor. Other raw types and non-raw formats are not supported.

	In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.		In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.

DrSlony: Updated for dc972ddb2

2019-10-23T18:36:51Z

Updated for dc972ddb2

← Older revision		Revision as of 18:36, 23 October 2019
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	# Open a raw photo of a negative.		# Open a raw photo of a negative.
	# In the Raw tab, activate the Film Negative tool.		# In the Raw tab, activate the Film Negative tool.
	# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick ~~white and black~~ spots" button, then click on a neutral light and dark spot in the photographed scene.		# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick neutral spots" button, then click on a neutral light and dark spot in the photographed scene.
	~~#:* These spots do not need to be exactly black and white, any two significantly different shades of grey will do~~.
	#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.		#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.
	#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied onto the other photographs of the same roll. This allows you to use any image in the whole roll to pick the ~~black and white~~ spots.		#:* The spots should differ in brightness, and should not be clipped.
			#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied and pasted onto the other photographs from the same roll. This allows you to use any image in the whole roll to pick the neutral spots.
	# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.		# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.
	#: Picking the ~~white and black~~ spots changes the raw data's values in the [[Toolchain_Pipeline\|pipeline]] before the white balance tool takes effect; therefore it is recommended to white-balance the photo after having picked the spots. If you white-balanced it before picking the spots that is fine, but you might want to re-white-balance it again afterwards.		#: Picking the neutral spots changes the raw data's values in the [[Toolchain_Pipeline\|pipeline]] before the white balance tool takes effect; therefore it is recommended to white-balance the photo after having picked the spots. If you white-balanced it before picking the spots that is fine, but you might want to re-white-balance it again afterwards.

	That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.		That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.

DrSlony at 09:09, 21 October 2019

2019-10-21T09:09:54Z

← Older revision		Revision as of 09:09, 21 October 2019
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	# In the Raw tab, activate the Film Negative tool.		# In the Raw tab, activate the Film Negative tool.
	# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick white and black spots" button, then click on a neutral light and dark spot in the photographed scene.		# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick white and black spots" button, then click on a neutral light and dark spot in the photographed scene.
	~~#: Regarding the white and black spots:~~
	#:* These spots do not need to be exactly black and white, any two significantly different shades of grey will do.		#:* These spots do not need to be exactly black and white, any two significantly different shades of grey will do.
	#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.		#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.
	#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied onto the other photographs of the same roll. This allows you to use any image in the whole roll to pick the black and white spots.		#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied onto the other photographs of the same roll. This allows you to use any image in the whole roll to pick the black and white spots.
	# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.		# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.
			#: Picking the white and black spots changes the raw data's values in the [[Toolchain_Pipeline\|pipeline]] before the white balance tool takes effect; therefore it is recommended to white-balance the photo after having picked the spots. If you white-balanced it before picking the spots that is fine, but you might want to re-white-balance it again afterwards.

	That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.		That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.

DrSlony: /* Usage */

2019-10-20T22:17:21Z

Usage

← Older revision		Revision as of 22:17, 20 October 2019
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	# Open a raw photo of a negative.		# Open a raw photo of a negative.
	# In the Raw tab, activate the Film Negative tool.		# In the Raw tab, activate the Film Negative tool.
	~~# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.~~
	# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick white and black spots" button, then click on a neutral light and dark spot in the photographed scene.		# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick white and black spots" button, then click on a neutral light and dark spot in the photographed scene.
	#: Regarding the white and black spots:		#: Regarding the white and black spots:
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	#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.		#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.
	#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied onto the other photographs of the same roll. This allows you to use any image in the whole roll to pick the black and white spots.		#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied onto the other photographs of the same roll. This allows you to use any image in the whole roll to pick the black and white spots.
			# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.

	That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.		That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.

DrSlony at 22:15, 20 October 2019

2019-10-20T22:15:12Z

← Older revision		Revision as of 22:15, 20 October 2019
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	# In the Raw tab, activate the Film Negative tool.		# In the Raw tab, activate the Film Negative tool.
	# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.		# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.
	# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick white and black spots" button, then click the ~~whitest~~ and ~~blackest~~ spots in the ~~actual image -~~ these ~~can be~~ spots in ~~the actual image captured on~~ film~~, or exposed and unexposed areas of~~ the ~~film frame itself~~. ~~Experiment to find which works best for you. This~~ needs to be done only once per film ~~role~~.		# Optionally, you can try to automatically set more accurate red and blue ratio values. To do so, click the "Pick white and black spots" button, then click on a neutral light and dark spot in the photographed scene.
			#: Regarding the white and black spots:
			#:* These spots do not need to be exactly black and white, any two significantly different shades of grey will do.
			#:* These spots should have had no color tint in the original scene, they should have a neutral hue. Keep in mind that these spots might not appear neutral in your photographed film negative until you use the [[White Balance]] tool.
			#: Picking the spots needs to be done only once per film roll, then the processing profile can be copied onto the other photographs of the same roll. This allows you to use any image in the whole roll to pick the black and white spots.

	That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.		That's it as far as correcting the negative goes. Resume adjusting the photo just as if it was a normal "positive" raw photo.

DrSlony at 19:04, 13 September 2019

2019-09-13T19:04:32Z

← Older revision		Revision as of 19:04, 13 September 2019
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	Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.		Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.

	The ~~photo must be~~ a Bayer of X-Trans ~~raw file~~. Other raw types and non-raw formats are not supported.		The tool supports raw photos of a Bayer of X-Trans sensor. Other raw types and non-raw formats are not supported.

	In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.		In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.

DrSlony at 19:03, 13 September 2019

2019-09-13T19:03:54Z

← Older revision		Revision as of 19:03, 13 September 2019
Line 2:		Line 2:

	Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.		Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.

			The photo must be a Bayer of X-Trans raw file. Other raw types and non-raw formats are not supported.

	In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.		In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.
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	== Usage ==		== Usage ==

	# Open a raw photo of a negative ~~(non-raw photos are not supported)~~.		# Open a raw photo of a negative.
	# In the Raw tab, activate the Film Negative tool.		# In the Raw tab, activate the Film Negative tool.
	# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.		# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.

DrSlony at 06:32, 18 July 2019

2019-07-18T06:32:37Z

← Older revision		Revision as of 06:32, 18 July 2019
Line 2:		Line 2:

	Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.		Negatives are images with reversed lightness and hues, such as those produced by film cameras. RawTherapee 5.7 introduced the Film Negative tool to make developing raw photos of negatives simple.

			In the negative image, each channel value is proportional to a power of the reciprocal of the corresponding channel in the original exposure (see [https://en.wikipedia.org/wiki/Photographic_film#Film_basics Photographic Film - Basics] for more info). Each channel value is raised to a different exponent, depending on the film type, age and possibly other factors, such as shooting conditions. These exponents can be specified in order to better adapt the correction process to the characteristics of each film. To simplify manual tweaking, these three R,G,B exponents are specified as one "reference" exponent (which gets applied to the Green channel), and two ratios of the Red and Blue exponents to the reference. Default values should produce reasonably good results out-of-the-box with some common Kodak film types like the ColorPlus 200 or Gold 200.

	== Usage ==		== Usage ==
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	=== Reference exponent (contrast) ===		=== Reference exponent (contrast) ===

			Exponent applied to the Green channel, and proportional to the other exponents applied to the Red and Blue channels. Changing this value alters the general image contrast without altering its colors. The default value is good for an average-contrast negative image. In case of a very faint, or incorrectly exposed negative, this value may have to be increased. In case of a very high contrast negative, the converted, positive image could reach clipping, so this value will need to be decreased.

	=== Red ratio ===		=== Red ratio ===

			Ratio of the Red channel exponent to the reference exponent. This coefficient indicates how "bent" the Red channel transfer curve is, with respect to the Green transfer curve. Changing this value alters the color characteristics of the correction, while keeping the general image contrast.

	=== Blue ratio ===		=== Blue ratio ===

			Ratio of the Blue channel exponent to the reference exponent. This coefficient indicates how "bent" the Blue channel transfer curve is, with respect to the Green transfer curve. Changing this value alters the color characteristics of the correction, while keeping the general image contrast.

DrSlony at 19:32, 17 July 2019

2019-07-17T19:32:24Z

← Older revision		Revision as of 19:32, 17 July 2019
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	== Usage ==		== Usage ==

	# Open a raw photo (non-raw photos are not supported).		# Open a raw photo of a negative (non-raw photos are not supported).
	# In the Raw tab, activate the Film Negative tool.		# In the Raw tab, activate the Film Negative tool.
	# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.		# White-balance the photo. Picking the white balance off a spot which should be neutral in hue, if the image has one, is easiest.