How would I create a 1x3 png with three rgb pixels?

[patrick99e99]

with the convert utility, how can I create a png image that is:

* 1px in height
* 3px in width
* pixel[0] is red
* pixel[1] is green
* pixel[2] is blue

?

[GeeMack]

with the convert utility, how can I create a png image that is [...]

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convert xc:#FF0000[1x1] xc:#00FF00[1x1] xc:#0000FF[1x1] +append rgb.png

[patrick99e99]

Thank you!

[fmw42]

This is sufficient:

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convert xc:#FF0000 xc:#00FF00 xc:#0000FF +append rgb.png

IM assumes 1x1 pixel if not specified by -size

[snibgo]

Just to be even more minimalist, colours can be specified by only three hex digits. IM replicated the digits as required.

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convert xc:#F00 xc:#0F0 xc:#00F +append rgb.png

[glennrp]

This is fine for Windows but on *nix the "#" will comment out the remainder of the line.

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magick xc:#F00 xc:#0F0 xc:#00F +append rgb.png

So, on *nix, use one of these:

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magick xc\#F00 xc:\#0F0 xc:\#00F +append rgb.png
magick xc:"#F00" xc:"#0F0" xc:"#00F" +append rgb.png
magick xc:red xc:lime xc:blue +append rgb.png