PHP: Hypertext Preprocessor (original) (raw)
imagecolorallocatealpha
(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)
imagecolorallocatealpha — Allocate a color for an image
Description
Parameters
image
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
red
Value of red component.
green
Value of green component.
blue
Value of blue component.
alpha
A value between 0
and 127
.0
indicates completely opaque while 127
indicates completely transparent.
The red
, green
and blue
parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.
Return Values
A color identifier or [false](reserved.constants.php#constant.false)
if the allocation failed.
Warning
This function may return Boolean [false](reserved.constants.php#constant.false)
, but may also return a non-Boolean value which evaluates to [false](reserved.constants.php#constant.false)
. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.
Changelog
Version | Description |
---|---|
8.0.0 | image expects a GdImage instance now; previously, a valid gd resource was expected. |
Examples
Example #1 Example of using imagecolorallocatealpha()
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mathnormal">ze</span><span class="mpunct">,</span></span></span></span>size);// something to get a white background with black border <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>a</mi><mi>c</mi><mi>k</mi><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>o</mi><mi>c</mi><mi>a</mi><mi>t</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">back = imagecolorallocate(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">ba</span><span class="mord mathnormal">c</span><span class="mord mathnormal" style="margin-right:0.03148em;">k</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ima</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">eco</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">oc</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mopen">(</span></span></span></span>image, 255, 255, 255); <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>e</mi><mi>r</mi><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>o</mi><mi>c</mi><mi>a</mi><mi>t</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">border = imagecolorallocate(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ima</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">eco</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">oc</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mopen">(</span></span></span></span>image, 0, 0, 0); imagefilledrectangle($image, 0, 0, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>s</mi><mi>i</mi><mi>z</mi><mi>e</mi><mo>−</mo><mn>1</mn><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">size - 1, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7429em;vertical-align:-0.0833em;"></span><span class="mord mathnormal">s</span><span class="mord mathnormal">i</span><span class="mord mathnormal">ze</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">1</span><span class="mpunct">,</span></span></span></span>size - 1, $back); imagerectangle($image, 0, 0, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>s</mi><mi>i</mi><mi>z</mi><mi>e</mi><mo>−</mo><mn>1</mn><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">size - 1, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7429em;vertical-align:-0.0833em;"></span><span class="mord mathnormal">s</span><span class="mord mathnormal">i</span><span class="mord mathnormal">ze</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">1</span><span class="mpunct">,</span></span></span></span>size - 1, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>e</mi><mi>r</mi><mo stretchy="false">)</mo><mo separator="true">;</mo></mrow><annotation encoding="application/x-tex">border);</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mclose">)</span><span class="mpunct">;</span></span></span></span>yellow_x = 100; $yellow_y = 75; $red_x = 120; $red_y = 165; $blue_x = 187; $blue_y = 125; $radius = 150;// allocate colors with alpha values <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>y</mi><mi>e</mi><mi>l</mi><mi>l</mi><mi>o</mi><mi>w</mi><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>o</mi><mi>c</mi><mi>a</mi><mi>t</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>p</mi><mi>h</mi><mi>a</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">yellow = imagecolorallocatealpha(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">ye</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">o</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ima</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">eco</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">oc</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal">lp</span><span class="mord mathnormal">ha</span><span class="mopen">(</span></span></span></span>image, 255, 255, 0, 75); <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>d</mi><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>o</mi><mi>c</mi><mi>a</mi><mi>t</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>p</mi><mi>h</mi><mi>a</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">red = imagecolorallocatealpha(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">re</span><span class="mord mathnormal">d</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ima</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">eco</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">oc</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal">lp</span><span class="mord mathnormal">ha</span><span class="mopen">(</span></span></span></span>image, 255, 0, 0, 75); <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>l</mi><mi>u</mi><mi>e</mi><mo>=</mo><mi>i</mi><mi>m</mi><mi>a</mi><mi>g</mi><mi>e</mi><mi>c</mi><mi>o</mi><mi>l</mi><mi>o</mi><mi>r</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>o</mi><mi>c</mi><mi>a</mi><mi>t</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>p</mi><mi>h</mi><mi>a</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">blue = imagecolorallocatealpha(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">u</span><span class="mord mathnormal">e</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ima</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">eco</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">or</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">oc</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal">lp</span><span class="mord mathnormal">ha</span><span class="mopen">(</span></span></span></span>image, 0, 0, 255, 75);// drawing 3 overlapped circle imagefilledellipse($image, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>y</mi><mi>e</mi><mi>l</mi><mi>l</mi><mi>o</mi><msub><mi>w</mi><mi>x</mi></msub><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">yellow_x, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">ye</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">o</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0269em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">x</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mpunct">,</span></span></span></span>yellow_y, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>a</mi><mi>d</mi><mi>i</mi><mi>u</mi><mi>s</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">radius, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">a</span><span class="mord mathnormal">d</span><span class="mord mathnormal">i</span><span class="mord mathnormal">u</span><span class="mord mathnormal">s</span><span class="mpunct">,</span></span></span></span>radius, $yellow); imagefilledellipse($image, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><msub><mi>d</mi><mi>x</mi></msub><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">red_x, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">re</span><span class="mord"><span class="mord mathnormal">d</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">x</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mpunct">,</span></span></span></span>red_y, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>a</mi><mi>d</mi><mi>i</mi><mi>u</mi><mi>s</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">radius, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">a</span><span class="mord mathnormal">d</span><span class="mord mathnormal">i</span><span class="mord mathnormal">u</span><span class="mord mathnormal">s</span><span class="mpunct">,</span></span></span></span>radius, $red); imagefilledellipse($image, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>l</mi><mi>u</mi><msub><mi>e</mi><mi>x</mi></msub><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">blue_x, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">u</span><span class="mord"><span class="mord mathnormal">e</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">x</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mpunct">,</span></span></span></span>blue_y, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>a</mi><mi>d</mi><mi>i</mi><mi>u</mi><mi>s</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">radius, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">a</span><span class="mord mathnormal">d</span><span class="mord mathnormal">i</span><span class="mord mathnormal">u</span><span class="mord mathnormal">s</span><span class="mpunct">,</span></span></span></span>radius, $blue);// don't forget to output a correct header! header('Content-Type: image/png');// and finally, output the result imagepng($image); ?>
The above example will output something similar to:
Example #2 Convert typical alpha values for use with imagecolorallocatealpha()
Usually alpha values of 0
designate fully transparent pixels, and the alpha channel has 8 bits. To convert such alpha values to be compatible with imagecolorallocatealpha(), some simple arithmetic is sufficient:
<?php $alpha8 = 0; // fully transparent var_dump(127 - ($alpha8 >> 1)); $alpha8 = 255; // fully opaque var_dump(127 - ($alpha8 >> 1)); ?>
The above example will output:
See Also
- imagecolorallocate() - Allocate a color for an image
- imagecolordeallocate() - De-allocate a color for an image
Found A Problem?
19 years ago
`If you only wish to extract the alpha value for a color, you can simply extract it like so:
alpha=alpha = alpha=color >> 24;?>It actually shifts off the first 24 bits (where 8x3 are used for each color), and returns the remaining 7 allocated bits (commonly used for alpha)
`
9 years ago
When working with transparency, avoid imagecreate() and use imagecreatetruecolor() instead. Transparency effects may not work as expected within a palette-based image.
17 years ago
`If you need to calculate the integer representation of a color with an alpha channel, without initialising an image and using the imagecolorallocatealpha function. Then this function might be of some help:
`