Base de comparación

Color Table 

33

Color Table

Color Table

Color T

Color Table files are accessed able files are accessed using the Colors using the Colors palettepalette (load only) (load only) ..

There is no version number written in

There is no version number written in the file. The file is exactly 76the file. The file is exactly 76

long, and contains 256 RGB colors: long, and contains 256 RGB colors:

ll The first color in the taThe first color in the table is index zeroble is index zero..

ll There are three bytes per color in the order Red, Green, Blue.There are three bytes per color in the order Red, Green, Blue.

If loaded into the

If loaded into the Colors palette, the colors will be Colors palette, the colors will be installed in the color swatch list asinstalled in the color swatch list as

RGB colors. RGB colors.

T 

T ABLE ABLE 33.3.300 CoCololor r tatabble le fifile le tytypepes s 

O

OSS FFiilleettyyppee//eexxtteennssiioonn

Mac OS

Mac OS 8BCT8BCT

Windows

Color Swatches  Color Swatches 

3

3

Color Swatches

Color Swatches

Color swatch files are loaded and saved in Photoshop’s Color Swatches palette. Color swatch files are loaded and saved in Photoshop’s Color Swatches palette. These are typically stored in the

These are typically stored in the

Color SwatchesColor Swatches

sub–directory in thesub–directory in the

PresetsPresets

directory. directory.

T 

T ABLE ABLE 33.3.311 CoCololor sr swwatatchches fes filile tye typepes s 

O

OSS FFiilleettyyppee//eexxtteennssiioonn

Mac OS

Mac OS 8BCO8BCO

Windows

Windows .ACO.ACO

T 

T ABLE ABLE 3.3.3232 CoCololor r swswatatchches es fifile le foformrmat at 

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Leennggtthh DDeessccrriippttiioonn

2

2 VVeerrssiioon n ( ( ==1 1 ))

2

2 CCoouunnt t oof f ccoolloorrs s iin n tthhe e ffiillee..

cou

count *nt *1010 ColColorsors. E. Each ach colcolor ior is 10 s 10 bybytestes, as , as descdescriberibed ind in TTablablee3.333.33..

At the end o

At the end of a version 1 file is the version 2 information.f a version 1 file is the version 2 information.

2

2 VVeerrssiioon n ( ( = = 2 2 ))

2

2 CCoouunnt t oof f ccoolloorrs s iin n tthhe e ffiillee. . TThhe e nneexxt t ttwwo o ffiieelldds s aarre e rreeppeeaatteed d ffoor r eeaacchh

count. count. cou

count *nt *1010 ColColorsors. E. Each ach colcolor ior is 10 s 10 bybytestes, as , as descdescriberibed ind in TTablablee3.333.33..

V

Varariaiabbllee UnUnicicodode se strtriingng: c: cololor or nanameme..

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T ABLE ABLE 33.3.333 CoCololor r ststrruuctctuurre e 

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2

2 TThhe e ccoolloor r ssppaacce e tthhe e ccoolloor r bbeelloonnggs s tto o ((sseeee TTablablee 3.343.34).).

8

8 FFoouur r sshhoort rt uunnssiiggnneed d iinntteeggeerrs s wwiitth h tthhe e aaccttuuaal l ccoolloor r ddaattaa. . IIf f tthhe e ccoolloorr

does not require four values, the extra values are undefined and should does not require four values, the extra values are undefined and should be written as zeros. See

Color Swatches  Color Swatches 

33

Photoshop allows the specification of custom colors, such as those colors that are Photoshop allows the specification of custom colors, such as those colors that are defined in a set

defined in a set of custom inks provided by a printing of custom inks provided by a printing ink manufacturerink manufacturer. These colors. These colors

can be stored in the Co

can be stored in the Colors palette and streamed to and from loalors palette and streamed to and from load files. The details ofd files. The details of

a custom color’s color data fields are not public and

a custom color’s color data fields are not public and should be treated as should be treated as a black box.a black box.

T

Tablablee3.353.35gives the color space IDs currently dgives the color space IDs currently defined by Photoshop for some customefined by Photoshop for some custom

color spaces. color spaces.

T 

T ABLE ABLE 33..3344 CCoolloor r ssppaacce Ie IDDs s 

C

Coolloor r IIDD DDeessccrriippttioionn

0

0 RRGGBB..

The first three values in the color data are

The first three values in the color data are red red ,, green green , and, and blue blue . They. They

are full unsigned 16–bit values as in Apple’s

are full unsigned 16–bit values as in Apple’sRGBColorRGBColordata structure.data structure.

Pure red = 65535, 0, 0. Pure red = 65535, 0, 0. 1

1 HHSSBB..

The first three values in the color data are

The first three values in the color data are hue hue ,, saturation saturation , and, and

brightness 

brightness . They are full unsigned 16–bit values as in Apple’s. They are full unsigned 16–bit values as in Apple’s

HSVColor

HSVColordata structure. Pure red = 0,65535, 65535.data structure. Pure red = 0,65535, 65535. 2

2 CCMMYYKK..

The four values in the color data are

The four values in the color data are cyan cyan ,, magenta magenta ,, yellow yellow , and, and black black 

..

They are full unsigned 16–bit values. They are full unsigned 16–bit values.

N

NOOTTEE::0 = 100% ink. For example, pure cyan = 0,65535,650 = 100% ink. For example, pure cyan = 0,65535,65535,65535.535,65535.

7

7 LLaabb..

The first three values in the color data are

The first three values in the color data are lightness lightness ,, a chrominance a chrominance , and, and

b chrominance  b chrominance ..

Lightness is a 16–bit value from 0...10000. Chrominance components Lightness is a 16–bit value from 0...10000. Chrominance components are each 16–bit values from –1280

are each 16–bit values from –12800...12700. Gray values are0...12700. Gray values are

represented by chrominance components of 0. Pure white = 10000,0,0. represented by chrominance components of 0. Pure white = 10000,0,0. 8

8 GGrraayyssccaallee..

The first value in the color data

The first value in the color data is the gray value, from 0...10000.is the gray value, from 0...10000.

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C

Coolloor r IIDD NNaammee

3

3 PPaannttoonne e mmaattcchhiinng g ssyysstteemm

4

4 FFooccoollttoonne e ccoolloouur r ssyysstteemm

5

Contours  Contours 

3

3

Contours

Contours

Contour settings files

Contour settings files (Photoshop 6.0) (Photoshop 6.0) are loaded aare loaded and saved in Photoshop’s Layernd saved in Photoshop’s Layer

Effects dialog. Effects dialog.

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OSS FFiilleettyyppee//eexxtteennssiioonn

Mac OS

Mac OS 8BFS8BFS

Windows

Windows .SHC.SHC

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L Leennggtthh DDeessccrriippttiioonn 4 4 TTyyppee(( == '8BFS''8BFS')) 2 2 VVeerrssiioon n ( ( = = 1 1 )) 4 4 CCoouunnt t oof f ccoonnttoouurrss

The following is repeated for each contour The following is repeated for each contour 4

4 VVeerrssiioon n ( ( = = 1 1 oor r 22))

V

Vaarriiaabbllee UUnniiccoodde se sttrriinngg: c: coonnttoouur nr naammee

V

Vaarriiaabbllee vveerrssiioon n 1 1 oor r 2 2 ddaatta a ffoolllloowwss. . SSeeee TTablablee3.383.38for version 1 andfor version 1 and

T

Tablablee 3.393.39for version 2.for version 2.

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T ABLE ABLE 33.3.388 ContContouourrs s VVerersision on 11

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2

2 CCoouunnt t oof f ppooiinnttss

4*

4* cocoununtt FFor or eaeach ch popoinint: t: 4 b4 bytytes es of of popoinint dt datata (a (2 b2 bytytes es vverterticicalal, 2 , 2 bybytetess

horizontal_ horizontal_ 4

4 MMiinniimmuum m iinnppuut t rraannggee

4

Contours  Contours 

33

T 

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2

2 CCoouunnt t oof f ppooiinnttss

4 *

4 * cocountunt FoFor er eacach ph poiointnt: P: Poioint nt datdata (a (2 b2 bytytes es vvertierticacal, l, 2 b2 bytytes es horhorizizontontalal))

1 *

1 * cocountunt FFor or eaceach h poipointnt: b: boooolelean an inindidicacatiting ng whewhethther er the the poipoint nt is is cocontntininuouuouss

4

4 MMiin n iinnppuut t rraannggee

4

Curves  Curves 

3

3

Curves

Curves

Curves settings files are loaded

Curves settings files are loaded in Photoshop’s Curves dialog and Black Generationin Photoshop’s Curves dialog and Black Generation

curve dialog (from within Separation Setu

curve dialog (from within Separation Setup Preferences). Curves files can also bep Preferences). Curves files can also be

loaded into any of Phot

loaded into any of Photoshop’s transfoshop’s transfer function dialogs, such as the er function dialogs, such as the Duotone CurveDuotone Curve

dialog from within Duotone Op

dialog from within Duotone Options, and Print transfer dialog. Curtions, and Print transfer dialog. Curves are saved asves are saved as

.ATF

.ATFandand.ACV.ACVfiles.files.

N

NOOTTEE:: When loaded into a transfer function dialog, only the first curve in a Curves fileWhen loaded into a transfer function dialog, only the first curve in a Curves file

is used. is used.

Null curves Null curves A

A

NULLNULL

curve (no change to curve (no change to image data) is represented by the image data) is represented by the following five–nfollowing five–number,umber,

ten–byte sequence in a file: ten–byte sequence in a file:

2 0 0 255 255 2 0 0 255 255

Displaying ink percentages Displaying ink percentages

Photoshop allows the option of displaying ink percentages instead of

Photoshop allows the option of displaying ink percentages instead of pixel vpixel values; thisalues; this

is a display option only and the internal data is unchanged, with 100% ink equal to is a display option only and the internal data is unchanged, with 100% ink equal to image data of 0 and 0% ink equal to image data of 255.

image data of 0 and 0% ink equal to image data of 255.

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O

OSS FFiilleettyyppee//eexxtteennssiioonn

Mac OS

Mac OS 8BSC8BSC

Windows

Windows .CRV.CRV

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T ABLE ABLE 33.4.411 CuCurvrves es fifile le ffoormrmat at 

L

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2

2 VVeerrssiioon n ( ( = = 1 1 oor r = = 44))

2

2 CCoouunnt t oof f ccuurrvvees s iin n tthhe e ffiillee..

The following is the data for each cur

The following is the data for each curve specified by count aboveve specified by count above

2

2 CCoouunnt t oof f ppooiinntts s iin n tthhe e ccuurrvve e ((sshhoorrt t iinntteeggeer r ffrroom m 22...1199))

point count * point count * 4

4

Curve points. Each curve point is a pair of short integers where the Curve points. Each curve point is a pair of short integers where the first number is the output value (vertical coordinate on the Curves first number is the output value (vertical coordinate on the Curves dialog graph) and the second is the input value. All coordinates have dialog graph) and the second is the input value. All coordinates have range 0 to 255. See also

Curves  Curves 

33

Curves data order Curves data order 1.

1. The first curve is a master curve that applies to all the composite channels (RGB)The first curve is a master curve that applies to all the composite channels (RGB)

when in composite image mode. when in composite image mode. 2.

2. The remaining curves apply to the active channels in order: curve two applies toThe remaining curves apply to the active channels in order: curve two applies to

channel one, curve three applies to channel two, etc., up until curve 17, which channel one, curve three applies to channel two, etc., up until curve 17, which applies to channel 16.

applies to channel 16. Indexed color

Indexed color

The exception to the normal order, and the reason there are up to 19 curves, is when The exception to the normal order, and the reason there are up to 19 curves, is when the mode is Indexed color. In this case:

the mode is Indexed color. In this case: 1.

1. The first curve is a master The first curve is a master curve.curve.

2.

2. The next three curves are created for the Red, Green, and Blue portions of theThe next three curves are created for the Red, Green, and Blue portions of the

image’s color table

image’s color table, and they are applied , and they are applied to the first channeto the first channel.l.

3.

3. The remaining curves apply to The remaining curves apply to any remaining alpha channel that any remaining alpha channel that is active: foris active: for

instance, if channel two is active, curve five applies to it; if

instance, if channel two is active, curve five applies to it; if channel three is active,channel three is active,

curve six applies to it, etc., up until curve 19, which applies to channel 16. curve six applies to it, etc., up until curve 19, which applies to channel 16. Single active channels

Single active channels

Photoshop handles single active channels in

Photoshop handles single active channels in a special fashion. When saving thea special fashion. When saving the

curves applied to a single channel, the settings are stored into the master curve, at curves applied to a single channel, the settings are stored into the master curve, at the beginning of the f

the beginning of the file. Similarlyile. Similarly, when reading a cur, when reading a curves file for application to a singleves file for application to a single

active channel, the master curve is the one that will be used on that channel. This active channel, the master curve is the one that will be used on that channel. This allows easy application of a single f

allows easy application of a single file to both RGB and ile to both RGB and grayscale images.grayscale images.

Additional information Additional information At the end of

At the end of the Versithe Version 1 file is the on 1 file is the following information:following information:

Extra level record info marker 

Extra level record info marker 'Crv ''Crv '

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T ABLE ABLE 33.4.422 ExtExtrra ca cururveves ms mararkeker r 

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4

4 == 'Crv ''Crv ' for extra curve informationfor extra curve information

2

2 VVeerrssiioon n ( ( = = 44))

2

2 CCoouunnt t oof f iitteemms s tto o ffoollllooww..

The following is the data for each cur

The following is the data for each curve specified by count aboveve specified by count above

2

2 BBeeffoorre e eeaacch h ccuurrvve e iis s a a cchhaannnneel l iinnddeexx..

2

Curves  Curves 

3

3

point count * point count * 4 4

Curve points. Each curve point is a pair of short integers where the Curve points. Each curve point is a pair of short integers where the first number is the output value (vertical coordinate on the Curves first number is the output value (vertical coordinate on the Curves dialog graph) and the second

dialog graph) and the second is the input value. All coordinates haveis the input value. All coordinates have

range 0 to 255. See also

range 0 to 255. See also “Null curves“Null curves”” below.below.

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T ABLE ABLE 33.4.422 ExtExtrra ca cururveves ms mararkeker r 

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