How give to imagemagick imagesize like parametr in bash?

[gyok]

I trying create B.png which will have same size as A.png, and will be created by tiling pencil.png. What I do:

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#!/bin/bash
size=$(identify -format %wx%h $1)
convert -size ${size} tile:pencil.png pencil_ground.png

but magick give me error:

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convert: invalid argument for option `-size': tile:pencil.png @ error/convert.c/ConvertImageCommand/2753.

if I set my size of image all works:

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#!/bin/bash
size=$(identify -format %wx%h $1) 
convert -size 500x500 tile:pencil.png pencil_ground.png

So how give to convert command size of another image?

[snibgo]

The error message suggests the value of ${size} is blank. What happens when you echo it? What happens when you start the script with:

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identify -format %wx%h $1

Does that output what you expect?