convert google.png -background white -alpha background google_bg_white.png It will look the very same as the original PNG. Often one will reprocess the original transparent PNG image so that it has some constant color underneath the alpha channel so that later one can remove the alpha channel and not have odd colors showing.
Simple Flatten (default background is white): convert google.png -flatten google_flatten.jpgįlatten with black background: convert google.png -background black -flatten google_flatten_black.jpg The stripes are from the underneath color below the alpha channel.Īlpha Channel (nicely antialiased): convert google.png -alpha extract google_alpha.jpg Turn alpha off: convert google.png -alpha off google_aoff.jpg However, the background color you use will change the appearance in transparent areas from that of the underneath color. I know of no significant issues using -background xx -flatten when converting PNG or GIF to JPG. PNG allows 8-bit transparency (partial transparent). GIF only allows binary transparency - fully transparent or fully opaque. But you should specify -background somecolor before -flatten, if you do not want the default background color. So you should use -flatten to properly do that conversion. JPG does not allow transparency and any transparent areas will show what color is underneath the transparency, which is often black. $image->writeImage($_SERVER."/test/newimage.png") Īssume that the following is the input image (image.The problem with converting PNG to JPG is when the PNG has transparency. The output can either be displayed on the server by using `echo`, or it can be saved locally with `writeImage()`. Then, the background color is set with the built-in function setImageBackgroundColor().
Imagemagic convert black background how to#
This PHP code snippet shows how to use the `setImageBackgroundColor()` function to set the background color of an image.įirst, a new Imagick object is created and the image is read in as input. Upon successful execution, it returns true and generates an image with the specified background color. This method accepts 'background' as an argument, which holds the desired background color. Public Imagick::setImageBackgroundColor(mixed $background): bool The syntax for this method is shown below − To set the background color of an image in PHP, we use the method ‘setImageBackgroundColor()’. There are a few cases where we need to set the background colors for the images, especially the images having text to increase their readability. The output obtained is srgb (0,0,0) which is ‘black’. $colorInfo = $color->getColorAsString () //Get the Color from ImagickPixelĮcho $colorInfo //display colorinfo as outputĪssume that the following is the input image (image.jpg) in the program − Output GetImageBackgroundColor) //Get the Background Color Finally, it prints out an RGB triplet representation of that color on your server. The code starts by creating an Imagick object and then retrieves the background color with this function.
To execute the code, you'll need a local server environment such as XAMPP. The following example shows how to use the `getImageBackgroundColor()` method in PHP to get the background color of an image. So based on that triplet, the user will be able to identify the color that is present in the background. Each element specifies the red, green, and blue components of the selected color. The return value is in the form of an RGB triplet which is a three-element row vector. Public Imagick :: getImageBackgroundColor() : ImagickPixel
If nothing is specified or found in the image, then the default background color is ‘white’. To identify the background color of an image using ImageMagick, we have a method named ‘getImageBackgroundColor()’. In the following sections, we will be learning how to identify the background color of an image, and how to set the background color for an image. If we look at the below image, we can observe that this is more readable than the previous image, the main reason for this is its background color. Selecting an appropriate background color for this element could improve its visibility. Using a suitable color that complements the context of the image or text helps in increasing the readability and even makes easier to scan.įor example, in the image below, we can see that "TUTORIALS POINT" is written on a plain background and is not very readable. The background color of a text of an image refers to the color of its background.
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