wxdkdraw file format

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Wxdkdraw file format

• Wxdkdraw file format
  • Symbols
    • Bitmap images
    • Arrowheads
    • Objects
  • Basics
    • Numeric values
    • Text encoding
    • Coordinates
    • Layers
    • Groups
    • Line widths
    • Line style and style length
    • Line ends (cap style)
    • Corner points (join style)
    • Fill style
    • Arrowheads
  • File structure
  • Header line
  • Records
    • Configuration records
      • Bounding box
      • Base line width
      • Zoom level
      • Borders
      • Grid unit
      • Grid base
    • Element records for grouping
      • Group start
      • Group end
    • Text labels
    • Graphic elements
      • Polyline
      • Open X-spline
      • Open arc
      • Polygon (closed polyline)
      • Closed X-spline
      • Closed arc
      • Circle
      • Filled dot
      • White filled dot
      • Ellipse
      • Box
      • Embedded image

Symbols

The following symbols are used later in this text.

Bitmap images

Symbol	Use
MAX	Maximum colour component value for a given bit depth, i. e. 255 for a bit depth of 8.
r	Red component, 0≤r≤MAX.
g	Green component, 0≤g≤MAX.
b	Blue component, 0≤b≤MAX.
e	Gray value, 0≤e≤MAX.
c	Cyan component, 0≤c≤MAX.
m	Magenta component, 0≤m≤MAX.
y	Yellow component, 0≤y≤MAX.
k	Key (black) component, 0≤k≤MAX.
maxrgb	Maximum value of r, g, and b.
max{x1, x2…}	Maximum of the listed values.
min{x1, x2…}	Minimum of the listed values.
median{x1, x2…}	Median of the listed values.

Arrowheads

Symbol	Use
l	Real line width.
la	Arrowhead length.
wa	Arrowhead width.
s	Shift length between corner point and arrowhead end.

Objects

Symbol	Use
cf,r	Red component of fill and text colour.
cf,g	Green component of fill and text colour.
cf,b	Blue component of fill and text colour.
cs,r	Red component of stroke colour.
cs,g	Green component of stroke colour.
cs,b	Blue component of stroke colour.
lb	Base line width in wxdkdraw units.
l	Line width in integer multiples of the base line width lb.
z	Zoom level, integer value.
sl	Style length, length of dashes in integer multiples of the line width.
xl	Left x  coordinate.
xr	Right x  coordinate.
yb	Bottom y  coordinate.
yt	Top y  coordinate.

---

Basics

Numeric values

All numeric values are specified in decimal notation.

Text encoding

UTF-8 encoding is used for all text, this includes text labels and file names of embedded images.

Coordinates

Single drawing
Each wxdkdraw file contains exactly one drawing.

Origin
The coordinates origin is the bottom left point. x values grow to the right, y values grow upwards.

Resolution
Coordinates are signed 32 bit integer values, negative values are allowed.
16,256,000 wxdkdraw units are used per inch.

Angles
Angles are specified counterclockwise in degree.

Image size
A wxdkdraw drawing is not bound to a specific paper size. The image size in wxdkdraw units is specified as bounding box in a configuration record.

Layers

Each graphic element is placed on a certain layer. Signed 16 bit integer values are used for layer numbers. −2¹⁵ is the deepest layer, 2¹⁵−1 is the uppermost layer.

Groups

Graphic elements can be grouped. Copy, Move and Delete operations affect all elements of a group.

Line widths

Line widths are specified in unsigned integer multiples of the base line width l_b. By default the base line width is 12700 wxdkdraw units ($\frac{1}{160}$ inch).
For export you have the option to change the base line width, i. e. to 11247 units (0.4pt).
Elements with line width 0 are not stroked.

Line style and style length

The style length s_l specifies the dash length in dash-dot lines in integer multiples of the line width. Changing the line width while keeping s_l automatically adjusts the dash-dot pattern.
Minimum is 1, maximum is 255.
The dot length is the line width. The gap length is the minimum of:

• Average of dash length and dot length and
• double dot length.

Style number	Style
0	Solid line.
1	Dashed line.
2	Dotted line.
3	Dash-dot line.
4	Dash-dot-dot line.
5	Dash-dot-dot-dot line.

Line ends (cap style)

Style number	Style
0	Butted
1	Rounded (half circle added)
2	Projecting (half square added)

Corner points (join style)

Style number	Style
0	Mitered
1	Rounded
2	Beveled

The miter limit m  is active for “mitered”. The distance between intersection of the outer edges and intersection of the inner edges must not exceed m  times the linewidth.

Fill style

Style number	Style
0	No filling.
1	Pure colour filling.
2	Diagonal lines 30° to the left.
3	Diagonal lines 30° to the right.
4	Diagonal lines 30° crosshatch.
5	Diagonal lines 45° to the left.
6	Diagonal lines 45° to the right.
7	Diagonal lines 45° crosshatch.
8	Horizontal bricks.
9	Vertical bricks.
10	Horizontal lines.
11	Vertical lines.
12	Horizontal-vertical crosshatch.
13	Horizontal shingles skewed to the right.
14	Horizontal shingles skewed to the left.
15	Vertical shingles skewed to one side.
16	Vertical shingles skewed to the other side.
17	Fish scales.
18	Small fish scales.
19	Circles.
20	Hexagons.
21	Octagons.
22	Horizontal zigzag lines.
23	Vertical zigzag lines.

The image below shows fill styles 0 to 23.

Arrowheads

The image below shows the available arrowhead types in wxdkdraw.

---

File structure

A wxdkdraw file is a text file you should process line by line.
Line size — including line ends (simple newline or CR/NL combination) — is restricted to 1023 characters.
A *.wxd file consists of a header line and records.

---

Header line

WXD major minor

Type	Name or value	Description
string	WXD	Constant text “WXD” to mark the file type.
uint16_t	major	Major file format version number (1).
uint16_t	minor	Minor file format version number (0).

---

Records

For each record there is a start line. For some record types details lines follow.
A start line starts immediately at the start of the line without leading spaces.
Details lines are intended by exactly one space or exactly one tabulator.
On problems while processing a record — i. e. an old program version attempts to read a file in a newer format version — the program can attempt to resume reading the file on the next record start line when encountering an unknown record type.

Configuration records

All configuration records must be placed before the first graphic element record.

Configuration records are started by a leading 0. Another integer number follows to choose a configuration option. Next we have configuration values.

Bounding box

0 0 x_l x_r y_b y_t

Type	Name or value	Description
int16_t	0	Record type: Configuration record.
int16_t	0	Sub type: Bounding box.
int32_t	xl	Left x  coordinate in wxdkdraw units.
int32_t	xr	Right x  coordinate in wxdkdraw units.
int32_t	yb	Bottom y  coordinate in wxdkdraw units.
int32_t	yt	Top y  coordinate in wxdkdraw units.

The bounding box record is required in each wxdkdraw file.

Base line width

0 1 l_b

Type	Name or value	Description
int16_t	0	Record type: Configuration record.
int16_t	1	Sub type: Base line width.
uint32_t	lb	Base line width in wxdkdraw units.

This record is optional, it should only be used if the base line width differs from the default line width ($\frac{1}{160}$ inch).

Zoom level

0 2 z

Type	Name or value	Description
int16_t	0	Record type: Configuration record.
int16_t	2	Sub type: Zoom level.
int8_t	z	Zoom level, -14≤z≤14.

This record is optional. By default a zoom level 0 (zoom factor 100 %) is used.
Positive zoom levels are used to zoom in, negative zoom levels are used to zoom out.
Each zoom level step changes the zoom by factor $\sqrt{2}$.

Borders

0 4 b_l b_r b_b b_t

Type	Name or value	Description
int16_t	0	Record type: Configuration record.
int16_t	4	Sub type: Borders.
uint32_t	bl	Left border in wxdkdraw units.
uint32_t	br	Right border in wxdkdraw units.
uint32_t	bb	Bottom border in wxdkdraw units.
uint32_t	bt	Top border in wxdkdraw units.

This record is optional. One inch borders are used by default.

Grid unit

0 5 u

Type	Name or value	Description
int16_t	0	Record type: Configuration record.
int16_t	5	Sub type: Grid unit.
uint8_t	u	Grid unit: 0 inches 1 centimeters

This record is optional. Inches are used by default.

Grid base

0 6 b

Type	Name or value	Description
int16_t	0	Record type: Configuration record.
int16_t	6	Sub type: Grid base.
uint8_t	b	Grid base: 0 Powers of 2 1 5 · powers of 2

This record is optional. Powers of two are used by default.

For zoom level 0 grid setup is used as follows:

Unit	Base	Optical grid	Snap grid
0 (inches)	0 (powers of 2)	2 / inch	8 / inch
0 (inches)	1 (5 · powers of 2)	2 / inch	10 / inch
1 (cm)	0 (powers of 2)	1 / cm	4 / cm
1 (cm)	1 (5 · powers of 2)	1 / cm	5 / cm

Element records for grouping

Group start

1

Type	Name or value	Description
int16_t	1	Record type: Start of group.

Group end

-1

Type	Name or value	Description
int16_t	-1	Record type: End of group.

Text labels

2 L c_f,r c_f,g c_f,b
 i_f s_f a_h f x y α
 t
 t_s

Type	Name or value	Description
int16_t	2	Record type: Text label.
int16_t	L	Layer number.
uint8_t	cf,r	Text colour, red component.
uint8_t	cf,g	Text colour, green component.
uint8_t	cf,b	Text colour, blue component.

The first details line specifies text representation and coordinates:

Type	Name or value	Description
uint8_t	if	Font index, 0≤if≤34.
uint16_t	sf	Font size in pt (the LaTeX unit pt, 72,26999 pt = 1 inch).
uint8_t	ah	Horizontal alignment: 0 left 1 centered 2 right
uint8_t	f	Flags, bitwise combination of: 1 LaTeX text
int32_t	x	Text anchor x  coordinate in wxdkdraw units.
int32_t	y	Text anchor y  coordinate in wxdkdraw units.
int16_t	α	Rotation counter-clockwise in degree.

The second details line contains the text to export (the “real” text):

Type	Name or value	Description
string	t	Text to export, the “real” text.

The third details line contains a simplified text shown on the screen:

Type	Name or value	Description
string	ts	Text to show on screen in wxdkdraw (simplified version of t).

If the third details line contains just a leading space/tabulator and the line end the export text is used for on-screen representation too.
The on-screen text should be a simplified version of the export text. If you want to export “\(R_1\)” for LaTeX, use an on-screen text “R1”.
Text must not contain newlines. Multi-line text must be specified in multiple text label records.
The text must not contain more than 1020 characters.
The font index i_f chooses a font from the table below.
For special text (LaTeX text) font index and font size are ignored. Use LaTeX instructions in the text instead.

Font index if	Font
0	Times Roman
1	Times Italic
2	Times Bold
3	Times Bold Italic
4	Avantgarde Book
5	Avantgarde Book Oblique
6	Avantgarde Demi
7	Avantgarde Demi Oblique
8	Bookman Light
9	Bookman Light Italic
10	Bookman Demi
11	Bookman Demi Italic
12	Courier
13	Courier Oblique
14	Courier Bold
15	Courier Bold Oblique
16	Helvetica
17	Helvetica Oblique
18	Helvetica Bold
19	Helvetica Bold Oblique
20	Helvetica Narrow
21	Helvetica Narrow Oblique
22	Helvetica Narrow Bold
23	Helvetica Narrow Bold Oblique
24	New Century Schoolbook Roman
25	New Century Schoolbook Italic
26	New Century Schoolbook Bold
27	New Century Schoolbook Bold Italic
28	Palatino Roman
29	Palatino Italic
30	Palatino Bold
31	Palatino Bold Italic
32	Symbol
33	Zapf Chancery Medium Italic
34	Zapf Dingbats

Graphic elements

Polyline

3 n L c_s,r c_s,g c_s,b l s_s s_l c j m a_f l_a,f w_a,f a_b l_a,b w_a,b
 x₁ y₁
 …

Type	Name or value	Description
int16_t	3	Record type: Polyline.
uint16_t	n	Number of points, at least 2.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	c	Line cap style.
uint8_t	j	Line join style.
uint8_t	m	Miter limit.
uint8_t	af	Arrowhead type, forward arrowhead.
uint8_t	la,f	Arrowhead length, forward arrowhead.
uint8_t	wa,f	Arrowhead width, forward arrowhead.
uint8_t	ab	Arrowhead type, backward arrowhead.
uint8_t	la,b	Arrowhead length, backward arrowhead.
uint8_t	wa,b	Arrowhead width, backward arrowhead.

There are n details lines containing point coordinates:

Type	Name or value	Description
int32_t	xi	X position.
int32_t	yi	Y position.

Open X-spline

4 n L c_s,r c_s,g c_s,b l s_s s_l c j m a_f l_a,f w_a,f a_b l_a,b w_a,b
 x₁ y₁ s₁
 …

Type	Name or value	Description
int16_t	4	Record type: Open X-spline.
uint16_t	n	Number of points, at least 2.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	c	Line cap style.
uint8_t	j	Line join style.
uint8_t	m	Miter limit.
uint8_t	af	Arrowhead type, forward arrowhead.
uint8_t	la,f	Arrowhead length, forward arrowhead.
uint8_t	wa,f	Arrowhead width, forward arrowhead.
uint8_t	ab	Arrowhead type, backward arrowhead.
uint8_t	la,b	Arrowhead length, backward arrowhead.
uint8_t	wa,b	Arrowhead width, backward arrowhead.

There are n  details lines containing point coordinates and s  parameter value:

Type	Name or value	Description
int32_t	xi	X position.
int32_t	yi	Y position.
float	si	S parameter value, -1≤s≤1.

Open arc

5 L c_s,r c_s,g c_s,b l s_s s_l c a_f l_a,f w_a,f a_b l_a,b w_a,b
 x₁ y₁ x₂ y₂ x₃ y₃

Type	Name or value	Description
int16_t	5	Record type: Open arc.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	c	Line cap style.
uint8_t	af	Arrowhead type, forward arrowhead.
uint8_t	la,f	Arrowhead length, forward arrowhead.
uint8_t	wa,f	Arrowhead width, forward arrowhead.
uint8_t	ab	Arrowhead type, backward arrowhead.
uint8_t	la,b	Arrowhead length, backward arrowhead.
uint8_t	wa,b	Arrowhead width, backward arrowhead.

The details line contains the coordinates of the 3 points clicked:

Type	Name or value	Description
int32_t	x1	X position point 1.
int32_t	y1	Y position point 1.
int32_t	x2	X position point 2.
int32_t	y2	Y position point 2.
int32_t	x3	X position point 3.
int32_t	y3	Y position point 3.

Polygon (closed polyline)

6 n L c_s,r c_s,g c_s,b c_f,r c_f,g c_f,b l s_s s_l j m s_f
 x₁ y₁
 …

Type	Name or value	Description
int16_t	6	Record type: Polygon (closed polyline).
uint16_t	n	Number of points, at least 2.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	j	Line join style.
uint8_t	m	Miter limit.
uint8_t	sf	Fill style.

There are n details lines containing point coordinates:

Type	Name or value	Description
int32_t	xi	X coordinate.
int32_t	yi	Y coordinate.

The start point is not repeated as end point.

Closed X-spline

7 n L c_s,r c_s,g c_s,b c_f,r c_f,g c_f,b l s_s s_l j m s_f
 x₁ y₁ s₁
 …

Type	Name or value	Description
int16_t	7	Record type: Closed X-spline.
uint16_t	n	Number of points, at least 2.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	j	Line join style.
uint8_t	m	Miter limit.
uint8_t	sf	Fill style.

There are n details lines containing point coordinates and spline value:

Type	Name or value	Description
int32_t	xi	X coordinate.
int32_t	yi	Y coordinate.
float	si	s  value for point, -1≤s≤1.

The start point is not repeated as end point.

Closed arc

8 L c_s,r c_s,g c_s,b c_f,r c_f,g c_f,b l s_s s_l j m s_f
 x₁ y₁ x₂ y₂ x₃ y₃

Type	Name or value	Description
int16_t	8	Record type: Closed arc.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	j	Line join style.
uint8_t	m	Miter limit.
uint8_t	sf	Fill style.

The details line contains the coordinates of the 3 points clicked:

Type	Name or value	Description
int32_t	x1	X position point 1.
int32_t	y1	Y position point 1.
int32_t	x2	X position point 2.
int32_t	y2	Y position point 2.
int32_t	x3	X position point 3.
int32_t	y3	Y position point 3.

Circle

9 L c_s,r c_s,g c_s,b c_f,r c_f,g c_f,b l s_s s_l s_f
 x y r

Type	Name or value	Description
int16_t	9	Record type: Circle.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	sf	Fill style.

The details line contains the coordinates:

Type	Name or value	Description
int32_t	x	Center point X position.
int32_t	y	Center point Y position.
uint32_t	r	Radius.

Filled dot

13 L c_f,r c_f,g c_f,b
 x y d

Type	Name or value	Description
int16_t	13	Record type: Colour filled dot.
int16_t	L	Layer number.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.

The details line contains the coordinates:

Type	Name or value	Description
int32_t	x	Center point X position.
int32_t	y	Center point Y position.
uint16_t	d	Diameter in integer multiples of the base line width.

The filled dot is used in electronic circuits to mark electrical connections on crossing nets.
It is placed by center point.

White filled dot

14 L c_s,r c_s,g c_s,b
 x y d l

Type	Name or value	Description
int16_t	14	Record type: White filled dot.
int16_t	L	Layer number.
uint8_t	cs,r	Fill colour, red component.
uint8_t	cs,g	Fill colour, green component.
uint8_t	cs,b	Fill colour, blue component.

The details line contains the coordinates:

Type	Name or value	Description
int32_t	x	Center point X position.
int32_t	y	Center point Y position.
uint16_t	d	Diameter in integer multiples of the base line width.
uint16_t	l	Line width of stroked border, l≤d.

The white filled dot is used in electronic circuits to mark pins at the end of a net.
It is placed by center point.

Ellipse

10 L c_s,r c_s,g c_s,b c_f,r c_f,g c_f,b l s_s s_l s_f
 x y r_x r_y α

Type	Name or value	Description
int16_t	10	Record type: Ellipse.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	sf	Fill style.

The details line contains the coordinates:

Type	Name or value	Description
int32_t	x	X coordinate.
int32_t	y	Y coordinate.
uint32_t	rx	X radius.
uint32_t	ry	Y radius.
int16_t	α	Rotation counterclockwise in degree.

Box

11 L c_s,r c_s,g c_s,b c_f,r c_f,g c_f,b l s_s s_l s_f
 x_l x_r y_b y_t r

Type	Name or value	Description
int16_t	11	Record type: Box.
int16_t	L	Layer number.
uint8_t	cs,r	Stroke colour, red component.
uint8_t	cs,g	Stroke colour, green component.
uint8_t	cs,b	Stroke colour, blue component.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.
uint16_t	l	Line width in integer multiples of the base line width.
uint8_t	ss	Line style.
uint8_t	sl	Style length.
uint8_t	sf	Fill style.

The details line contains the coordinates.

Type	Name or value	Description
int32_t	xl	Left X coordinate.
int32_t	xr	Right X coordinate.
int32_t	yb	Bottom Y coordinate.
int32_t	yt	Top Y coordinate.
uint32_t	r	Corner radius (0 for simple rectangle).

The rounded corners radius must be smaller than half the smaller rectangle side length.

Embedded image

12 L c_f,r c_f,g c_f,b
 f m_rgb2gray m_rgb2cmyk x y w h
 n_f

Type	Name or value	Description
int16_t	12	Record type: Embedded image.
int16_t	L	Layer number.
uint8_t	cf,r	Fill colour, red component.
uint8_t	cf,g	Fill colour, green component.
uint8_t	cf,b	Fill colour, blue component.

The background colour is only used if the image contains an alpha channel and no background colour information.

The first details line contains flags and coordinates:

Type	Name or value	Description
uint8_t	f	Flags, see table below.
int8_t	mrgb2gray	Method for RGB to gray conversion.
int8_t	mrgb2cmyk	Method for RGB to CMYK conversion.
int32_t	x	X position of lower left point.
int32_t	y	Y position of lower left point.
uint32_t	w	Image width (must be larger than 0).
uint32_t	h	Image height (must be larger than 0).

The second details line contains the image file name:

Type	Name or value	Description
string	nf	Image file name.

UTF-8 encoding is used for the file name. I recommend to use ASCII characters only in file names.
Relative file names should be used.

The flags f value is an or-combination of the following bits (bit 0 is the least significant bit on the right):

Bit number	Purpose
0	Keep aspect ratio: 0 no 1 yes
1	Use opacity value from alpha channel: 0 no, ignore alpha channel 1 yes, mix foreground against background
2	Allow image interpolation: 0 no 1 yes
3	Allow direct re-use of DCT-compressed data: 0 no 1 yes
4	Allow image interpolation on directly re-used DCT data: 0 no 1 yes
5	Enforce background colour from WXD file: 0 no, prefer background colour information from image file if available 1 yes

The following m_rgb2gray values can be used to choose the RGB to gray conversion method:

Value	Formula	Method
-1		Default method.
0	$e=\frac{299r+587g+114b}{1000}$	Keep luminance as specified by ITU BT601.
1	$e=\frac{30r+59g+11b}{100}$	Alternative method to keep luminance (shorter coefficients).
2	$e=(77r+151g+28b)>>8$	Fast and a little inaccurate by avoiding divisions.
3	$e=\left(\right(r<<1\left)+\right(g<<2)+g+b)>>3$	Faster and more inaccurate by avoiding both multiplications and divisions.
4	$e=\frac{2126r+7152g+722b}{10000}$	Keep luminance as specified by ITU BT709.
5	$e=\frac{r+g+b}{3}$	Average.
6	$e=\frac{\max (r,g,b)+\min (r,g,b)}{2}$	Desaturation.
7	$e=\min (r,g,b)$	Minimum decomposition.
8	$e=\mathrm{median}(r,g,b)$	Median decomposition.
9	$e=\max (r,g,b)$	Maximum decomposition.
10	$e=r$	Red channel.
11	$e=g$	Green channel.
12	$e=b$	Blue channel.

The following m_rgb2cmyk values can be used to choose the RGB to CMYK conversion method:

Value	Method
-1	Default method (same as 0).
0	Algorithm as not described in Adobe PS and PDF standard.
1	Simplified algorithm from Adobe PS and PDF standard without undercolor removal and black correction.

The m_rgb2cmyk value is ignored, wxd2lat produces RGB or gray output only.

Algorithm 0:

maxrgb = max{r,g,b}
if 0 = maxrgb
then
 k = MAX
 c = m = y = 0
else
 c = maxrgb - r
 m = maxrgb - g
 y = maxrgb - b
 c = (MAX * c) / maxrgb
 m = (MAX * m) / maxrgb
 y = (MAX * y) / maxrgb
 k = MAX - maxrgb
endif

Algorithm 1:

maxrgb = max{r,g,b}
c = maxrgb - r
m = maxrgb - g
y = maxrgb - b
k = MAX - maxrgb

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