Graphics, Figures & Tables ⇒ How to get image size by code (to crop it)

[nphaibk]

I want to crop images (which can be done by the option 'trim = l b r t'). This means I need to know the absolute size (in points or cm or inch ...) to set the parameters for the option 'trim'.

I can look at the image for the real size, but it is not convenient because I have a lot of images. Does anyone know how to get image size by code? something like \textwidth for width of text

many thanks, Hai

[nphaibk]

I found the answer

1. add a new length command:

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   \newlength{\imagewidth}  % the name can be chosen, e.g. picwidth...

2. Before using \imagewidth, set the width of image to it by

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   \settowidth{\imagewidth}{\includegraphics{yourimage}}

3. When using in calculation, remember to add {}, like this \imagewidth{}:

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   \includegraphics[trim = 0 0 0.5\imagewidth{} 0, clip=true, width=4cm]{yourimage} % get the left part of your image