Talk:New Colours Format

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[edit] Binary formats description

You can get samples of these by installing trial versions of the softwares.


[edit] Adobe Color Book (.acb)

The only addition to Ates Goral’s description is a little change at the end of the file for the CS2 and CS3 color books: these files end with a 8 bytes string saying spflspot for spot colors and spflproc for process colors.


[edit] Binary Color File (.bcf)

Most of this was found by comparing with the little documented ACF format.


Byte order is big-endian. Strings are NUL padded. Except for the Lab values, all shorts are unsigned. Character encoding is Mac Roman.


Version: 8bytes string (ACF 1.0/ACF 2.1/BCF 2.0)

Library Name: 32bytes string

Library Version: 8bytes string

Copyright: 32bytes string

About Message: 512bytes string

Names: short (1=Partial/2=Full)

Rows: short

Columns: short

Entries: short

Prefix: 12bytes string

Suffix: 4bytes string

Palette Type: short (1=Spot/2=Process/8=?/16=hifi/32=?)

4 shorts. I thought it could be some model list like in the ACF format but since every file I've analyzed has RGB and CMYK values, I don't know what are these...

  • The first one is 1 for the Munsell palettes which contains XYZ values, 0 for the other ones, even for the PANTONE® Process Euro file which also has XYZ values... could be a mistake...
  • For the second and the third ones (still 0 or 1), I couldn't find any relationship with anything else.
  • The last one is probably Preferred Model where 1=RGB and 2=CMYK. I don't know what 8 and 16 stand for.

In version ACF 1.0, the color list starts here with <Entries>*54bytes: 3 shorts (XYZ), 4 shorts (CMYK), 3 shorts (RGB), 1 short (Type) and a 32bytes string (colour name).

In higher versions (ACF 2.1 and BCF 2.0), the palette informations goes on:

About Message extender: short. If this one is 1, it's followed by a 100bytes string which is to be added to the About Message.

HiFi Inks: short

Number of HiFi Inks: short

Lab: short. If this equals 1, colours have Lab values.

22 bytes, always 0 in all the files I've analyzed

2 bytes: 0x0168 (360) for the PANTONE® HEXACHROME files, 0 for the others

If <HiFi Inks> equals 1, here comes <Number of HiFi Inks>*54 bytes: 2*10bytes string and 1 short (should be the angle used to print halftone screens; the frequency or screen ruling used in printing halftones; and the neutral density of the ink for trapping; if it's like ACF) followed by a 32bytes string (Ink name).

Color list starts here:

Lab values: 3 shorts (=0 if <Lab>=0)

CMYK values: 4 shorts

RGB values: 3 shorts

If <Palette Type> equals 8 or 16, here comes 34bytes: 1 short (number of hifi inks used), 8 pairs of shorts (ink id/ink value)

Colour Type: 1 short

If <Palette Type> equals 8 or 16, Model: 1 short

Colour Name: 32bytes string

[edit] Corel Palette (.cpl)

Byte order is little-endian. Strings are composed of a char followed by <char> single or double-byte characters.

Colour spaces:

2CMYK bytes 5-8 [0..100]
4CMY bytes 5-7 [0..255]
5RGB bytes 5-7 [0..255]
6HSB bytes 5-8 5+6=long H[0..360] SB[0..255]
7HLS bytes 5-8 5+6=long H[0..360] LS[0..255]
9Grayscale byte 5 [0..255]
11YIQ bytes 5-7 [0..255]
12CMYK bytes 5-8 [0..255]
15Hexachrome bytes 3-8 YOMCGK[0..255]
17CMYK bytes 5-8 [0..255]
18Lab bytes 5-7 [0..255]
20Registration bytes 5-8 [0..100]


[edit] Version 5-8

Version: 2bytes hex string (ccbc/ccdc)

Entries: short


Color List

Colour space: short

Character encoding: short (1,2,7 => double-byte; 5,11 => single-byte)

Colour Values: 8 chars

Colour Name: string


[edit] Version 9-11

Version: 2bytes hex string (cdbc/cddc)

4 longs: always 3,0,30,1 in the files I've analysed

1 long: unknown1

1 long: always 2

1 long: unknown2 = unknown1 + 2 = palette header size - 2

Palette Name: string (cdbc => double-byte; cddc => single-byte)

1 short: unknown3

Entries: short


Colour List: there are 2 different ways to describe the colours but I don't know what should lead me to the long or the short way...

The short way is the same as 5-8

Here is the long way:

Order: long

Colour space 1: short

Character encoding 1: short

Colour Values 1: 8 chars

Colour space 2: short

Character encoding 2: short

Colour Values 2: 8 chars

Colour Name: string


[edit] Version 12-13

Version: 2bytes hex string (dddc)

Same as 9-11 except that the palette name is double-byte encoded


[edit] Special Palettes

Version: 2bytes hex string (dcdc)

Palette Name: string

Entries: short


Colour List

same as 5-8

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