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Outline a transparent image using imagick PHP


Outline a transparent image using imagick PHP

By : Jacopo Melloni
Date : December 01 2020, 05:00 PM
Any of those help I'll start at the command line and may do the PHP later, or let you work that bit out...
Step 1 - Extract transparency
code :
convert tux.png -alpha extract alpha.png
convert alpha.png -morphology edge octagon -threshold 50% edge.png
convert alpha.png \( +clone -statistic maximum 3x3 -threshold 50% \) -compose difference -composite edge.png
convert edge.png -fill red -opaque white -transparent black rededge.png
convert tux.png rededge.png -composite result.png
convert tux.png  \( +clone -alpha extract -morphology edge octagon -threshold 50% -fill red -opaque white -transparent black \) -composite result.png
   $image = new Imagick("tux.png");
   $alpha = clone $image;
   $alpha->separateImageChannel(Imagick::CHANNEL_ALPHA);
   $alpha->negateImage(true);
   $alpha->edgeImage(5);
   $alpha->opaquePaintImage("white","red",65000,FALSE);
   $alpha->transparentPaintImage("black",0.0,0,FALSE);
   $image->compositeImage($alpha,Imagick::COMPOSITE_DEFAULT,0,0);
   $image->writeImage("result.png");


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Imagick motion blur on composite, transparent image

Imagick motion blur on composite, transparent image


By : Ayatullah Rafsanjani
Date : March 29 2020, 07:55 AM
may help you . I'm trying to compose an image of multiple existing images, and apply motion blur on it. I'm using a transparent canvas, to draw all the images. Here is the result: , Try adding the parameter for the channel:
code :
$canvas->motionblurimage(100, 40, 90, Imagick::CHANNEL_ALL);
Imagick cut out parts of image and make them 100% transparent alpha

Imagick cut out parts of image and make them 100% transparent alpha


By : Tlahuicole
Date : March 29 2020, 07:55 AM
To fix the issue you can do I believe the composite option(s) your thinking of are Screen & Multiply, but I also don't believe they'll give you the results your expecting. Generally in ImageMagick's documentation, masks are considered alpha-channel values/mattes (i.e. black = 0.0 = opaque, and white = 1.0 = transparent.) Simply flip, or negate, your $coutout_holes image, and apply it as the alpha channel.
code :
<?php
$main = new Imagick('any.png');
$cutout_holes = new Imagick('mask.png');

// If original mask wasn't already negated, do it here.
$cutout_holes->negateImage(FALSE);

// Null any previous alpha states. Same as -alpha off
$main->setImageAlphaChannel(Imagick::ALPHACHANNEL_DEACTIVATE);
// (and/or) Drop matte state of mask. Same as +matte
$coutout_holes->setImageMatte(FALSE);

// Apply holes mask as the new alpha channel.
$main->compositeImage($cutout_holes, Imagick::COMPOSITE_COPYOPACITY, 0, 0);
PHP: Imagick: Merge Transparent Image

PHP: Imagick: Merge Transparent Image


By : Rebecca D'Esposito
Date : March 29 2020, 07:55 AM
around this issue You just need to set the background to transparent on the original JPEG image.
code :
<?
$s1=    new Imagick('img.jpg');
$s2=    new Imagick('img2.jpg');
$s2->setImageFormat ('png');
$s2->setImageBackgroundColor("transparent"); // <= Here
$s2->vignetteImage(20, 20, 40, - 20); 
$s2->setImageVirtualPixelMethod(Imagick::VIRTUALPIXELMETHOD_TRANSPARENT);
$s1->compositeImage($s2, Imagick::COMPOSITE_DEFAULT,120,120, Imagick::CHANNEL_ALPHA);
$s2->setImageMatte(TRUE);
How To Outline a PNG (Transparent) image with CSS?

How To Outline a PNG (Transparent) image with CSS?


By : anish rayeen
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Simple Image Swap on Hover...
JSFiddle
code :
<div class="wrapper">
  <img class="main" src="http://lorempixel.com/400/200/food/1/" />
  <img class="hover" src="http://lorempixel.com/400/200/food/2/" />
</div>


img.hover {
  display: none;
}
.wrapper:hover img.main {
  display: none;
}
.wrapper:hover img.hover {
  display: block;
}
How to make specified area of an image transparent with Imagick?

How to make specified area of an image transparent with Imagick?


By : Likith Kumar
Date : March 29 2020, 07:55 AM
To fix the issue you can do You need to make a black and white mask image the size of your input (white where you want it to be opaque and black where you want it to be transparent). Then use the equivalent of -compose copyopacity -composite to put the mask into the alpha channel of the image. Sorry, I do not code Imagick.
Here is an example using ImageMagick command line syntax:
code :
convert logo.jpg \( -size 640x480 xc:white -size 200x200 xc:black -geometry +200+100 -compose over -composite \) +geometry -alpha off -compose copy_opacity -composite result.png
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