Get and save image dimension in memory?

[Don]

Hello,

I was wondering if it's possible to get an image dimension and then save it into memory for later use, like the following:

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convert \( -size 400 -background transparent caption:”this is some text“ -write mpr:captionText +delete \) \( mpr:captionText -format "%[fx:h]" INFO: -write mpr:imgWidth +delete \)

When you don't supply the height for -size when using the caption command and just the width, the height is automatically determined for your image/text which is great and really glad it's capable of doing this, but what if I want to find out what the height from the caption command will be without having to write the image to disk but to memory instead so that I can use the height for something else?

Thanks in advance.

[snibgo]

Your bash command has bad syntax. It must end with an output filename (which could be "info:"). Within the command, you can "+write info:" at any time.

To capture the single-line output from a bash command, use backtick, like this:

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$ size=`convert rose: -format %[fx:h] info:`
$ echo $size
46

[fmw42]

This should work and is similar to snibgo's suggestion.

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height=`convert -pointsize 36 -size 400x caption:"This is some long text that should wrap to the next line" -format "%h" info:`

echo "$height"
126

Or perhaps you want to save it inline. If so, then

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convert -pointsize 36 -size 400x caption:"This is some long text that should wrap to the next line" -set option:hsize "%h" -format "%[hsize]" info: 

126

Perhaps a better explanation of what you are trying to do later with the height would help us understand what you want.