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POImageMagick Reflection
 

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    <p>Brief:</p> <pre><code>convert ( -size 585x128 gradient: ) NewImage.png </code></pre> <p>How do I change the above ImageMagick command so it takes the width and height from an existing image? I need it to remain a one line command.</p> <hr> <p>Details:</p> <p>I'm trying to programatically create an image reflection using ImageMagick. The effect I am looking for is similar to what you would see when looking at an object on the edge of a pool of water. There is a pretty good thread on what I am trying to do <a href="http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&amp;t=11585" rel="nofollow noreferrer">here</a> but the solution isn't exactly what I am looking for. Since I will be calling ImageMagick from a C#.Net application I want to use one call without any temp files and return the image through stdout. So far I have this...</p> <pre><code>convert OriginalImage.png ( OriginalImage.png -flip -blur 3x5 \ -crop 100%%x30%%+0+0 -negate -evaluate multiply 0.3 \ -negate ( -size 585x128 gradient: ) +matte -compose copy_opacity -composite ) -append NewImage.png </code></pre> <p>This works ok but doesn't give me the exact fade I am looking for. Instead of a nice solid fade from top to bottom it is giving me a fade from top left to bottom right. I added the (-negate -evaluate multiply 0.3 -negate) section in to lighten it up a bit more since I wasn't getting the fade I wanted. I also don't want to have to hard code in the size of the image when creating the gradient ( -size 585x128 gradient: ) I'm also going to want to keep the original image's transparency if possible.</p> <p>To go to stdout I plan on replacing "NewImage.png" with "-"</p>
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    1. COI can answer this when I get home this evening. Commenting so that I can find the question again on my user page.
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    2. COI didn't put this in an answer because it doesn't directly address the constraints you expressed, but I think it's useful info (especially in a *nix oriented context): http://blogs.sun.com/constantin/entry/presenting_images_and_screenshots_the
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    3. COJust for reference, here is a PHP script that utilizes the GD library to do what I believe you want: http://reflection.corephp.co.uk
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