This! is an RGB colour grid...

Basically it's a 2-dimensional matrix in which:

• The first row, and the first column, are red.


• The second row, and the second column, are green.


• The third row, and the third column, are blue.

Here are the colours described graphically, using the letters R, G, and B.

Here's how we calculate the colour of each space on the grid is calculated.

• Red + Red = Red (#FF0000)


• Green + Green = Green (#00FF00)


• Blue + Blue = Blue (#0000FF)


• Red + Green = Yellow (#FFFF00)


• Red + Blue = Purple (#FF00FF)


• Green + Blue = Teal (#00FFFF)

The Challenge

• Write code to generate an RGB colour grid.


• It's code golf, so attempt to do so in the smallest number of bytes.


• Use any programming language or markup language to generate your grid.


• Things I care about:
  
  
  • The result should graphically display an RGB grid with the defined colours.
  
  


• Things I don't care about:
  
  
  • If the output is an image, HTML, SVG or other markup.
  
  
  • The size or shape of the colour blocks.
  
  
  • Borders, spacing etc between or around the blocks.
  
  
  • It definitely doesn't have to have labels telling you what the row and column colours should be.
  
  

Wolfram Language (Mathematica), 41 bytes

Image@Outer[Plus,#,#,1]&@IdentityMatrix@3

Wolfram Language (Mathematica), 68 bytes

Mathematica has built-ins for all these colors.

Image@Red,Yellow,Magenta,Yellow,Green,Cyan,Magenta,Cyan,Blue

Wolfram Language (Mathematica), 72 bytes

Grid@Partition[RGBColor/@Unitize[Total/@Tuples[IdentityMatrix@3,2]],3]

Perl 6 (and probably similar for many languages) (31 bytes)

'ÿ ÿÿÿ ÿ ÿÿ ÿ ÿÿÿ ÿ ÿÿ ÿ' # replace spaces with ASCII 00
 # which I can't seem to enter

This outputs a headless TIFF file, which used to be generated by Photoshop with the file extension .raw and is presumed to be square unless otherwise specified at the time of opening. Playing around with the color depth (if allowed) could reduce this down further.

GFA Basic 2.02 (Atari ST), 48 bytes

A manually edited listing in .LST format. Includes many non-printable characters, whose codes are shown within brackets.

?"[ESC]c[SOH] [ESC]c[ETX] [ESC]c[ENQ] "[CR]
?"[ESC]c[ETX] [ESC]c[STX] [ESC]c[ACK] "[CR]
?"[ESC]c[ENQ] [ESC]c[ACK] [ESC]c[EOT] "[CR]

The operating system of the Atari ST defines extended VT52 commands which are used here.

Output

The output is a block of $24times24$ pixels (9 space characters of $8times8$ pixels).

^{screenshot from Steem SSE}

HTML/CSS, 278 bytes

.acolor:#ff0.bcolor:#f0f.ccolor:#0ff

<table><tr><td style="color:red">█</td><td class=a>█</td><td class=b>█</td></tr><tr><td class=a>█</td><td style="color:#0f0">█</td><td class=c>█</td></tr><tr><td class=b>█</td><td class=c>█</td><td style="color:#00f">█

Uses Unicode █ (U+2588) for the "blocks", and uses CSS classes/inline style to color them.

Uses a HTML table for layout, this is probably the part most susceptible to golfing