[ALUG] ImageMagick convert

[Bill Hill]

Mark Rogers wrote:
> Any experts in using ImageMagick lurking?
> 
> I need to resize an image to fit into a 350x350 box. Which means I need 
> to (a) scale the image so no dimension exceeds 350, then (b) centre the 
> image in a 350x350 canvas.
> 
> Eg for a 700x600 image, (a) creates a 350x300 image which (b) then 
> converts to 350x350 without distorting it (by adding "whitespace".
> 
> Ideally I want some control over what the canvas colour ("whitespace") 
> will be, in particular transparent would be a good option, but white 
> will do for now.
> 
> The first bit is easy:
>     convert -resize 350x350 old.png new.png
> I've tried various ways to do step (b) without success. (A single 
> command which does both would be best, but two separate commands would 
> be a start!)
> 
convert -border 2x0 -bordercolor #0000FF -resize 350x350 input.jpg
-background #FFE000 -gravity center -extent 350x350 output.jpg

You might want to change the colours, though.

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