imagemagick: create a .png file which is just a solid rectangle

Question

I want to create a .png file which is just a solid color.

This must be easy to do using ImageMagick but I can't figure out the problem:

C:\tmp>convert -size 8x16 -stroke black -fill black -draw "rectangle 0,0,8,16" black.png
Magick: missing an image filename `black.png' @ error/convert.c/ConvertImageComm
and/3016.

score 91 · Accepted Answer · answered Oct 14 '11 at 18:58

91

Obviously there can be more options, like borders and etc, but if you just want an image of width x height of a given hex color, it's pretty straight forward.

Here's all it takes to make an 100x100 image of a solid dark red:

convert -size 100x100 xc:#990000 whatever.png

answered Oct 14 '11 at 18:58

Mike Flynn

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great, thanks! (btw, where's the docs for xc: and what does it stand for? I can't seem to find them via google) – Jason S Oct 14 '11 at 20:20
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It's a shortcut for color codes. You can put hex, rgb() or even a color name in there. I'm honestly not sure what it stands for though. More info: http://www.imagemagick.org/script/color.php – Mike Flynn Oct 15 '11 at 00:19
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You can also use rgba values `convert -size 100x100 xc:rgba\(255,0,0,0.4\) whatever.png` – luk3thomas Jan 15 '14 at 19:36
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This is what I love about unix tools. I was going to make a python program for this but then I remembered imagemagick. Nothing beats a bash one-liner – Rombus Jul 04 '16 at 19:25
@luk3thomas does that make the `whatever.png` semi-transparent? I tried command (in graphicsmagick) and although the command succeeded, it created a solid red rectangle. – CMCDragonkai Jul 31 '16 at 11:41
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The `xc:#...` is a pseudo-image format; an alias for `canvas:#...` -- look at the "Pseudo-image Formats" section of http://www.imagemagick.org/script/formats.php – user295691 Oct 27 '16 at 15:33
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On Unix-like systems, hex colors and rgb(...) colors must be enclosed in quotes. – fmw42 Aug 29 '19 at 15:55

score 10 · Answer 2 · answered Oct 11 '16 at 15:04

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Note that for rgb and rgba values, you need to escape the parentheses. Building on @Mike Flynn and @luk3thomas (who correctly escapes the color code):

convert -size 100x100 xc:rgb\(0,255,0\) whatever.png
convert -size 100x100 xc:rgba\(0,255,0, 0.4\) whatever.png

answered Oct 11 '16 at 15:04

DaveL17

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Or quote : `convert -size 100x100 'xc:rgb(0,255,0)' whatever.png` or `convert -size 100x100 "xc:rgb(0,255,0)" whatever.png` . – Stéphane Gourichon Jun 21 '21 at 08:45

score 4 · Answer 3 · answered Aug 29 '19 at 06:23

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In Mac

convert -size 100x100 xc:"#8a2be2" blue@2x.png

answered Aug 29 '19 at 06:23

dengST30

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imagemagick: create a .png file which is just a solid rectangle

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