PHP:imagefilter()的用法_GD库图像处理函数(php img)

编辑：rootadmin

imagefilter

推荐整理分享PHP:imagefilter()的用法_GD库图像处理函数(php img)，希望有所帮助，仅作参考，欢迎阅读内容。

文章相关热门搜索词:php img,php imagettftext,php imagefill,php imagestring,php image,php imagettftext,php imagettftext,php imagettftext,内容如对您有帮助，希望把文章链接给更多的朋友！

(PHP 5)

imagefilter — 对图像使用过滤器

说明 bool imagefilter ( resource $src_im , int $filtertype [, int $arg1 [, int $arg2 [, int $arg3 ]]] )

imagefilter() 把过滤器 filtertype 应用到图像上，在需要时使用 arg1，arg2 和 arg3。

filtertype 可以是下列中的一个： IMG_FILTER_NEGATE：将图像中所有颜色反转。 IMG_FILTER_GRAYSCALE：将图像转换为灰度的。 IMG_FILTER_BRIGHTNESS：改变图像的亮度。用 arg1 设定亮度级别。 IMG_FILTER_CONTRAST：改变图像的对比度。用 arg1 设定对比度级别。 IMG_FILTER_COLORIZE：与 IMG_FILTER_GRAYSCALE 类似，不过可以指定颜色。用 arg1，arg2 和 arg3 分别指定 red，blue 和 green。每种颜色范围是 0 到。 IMG_FILTER_EDGEDETECT：用边缘检测来突出图像的边缘。 IMG_FILTER_EMBOSS：使图像浮雕化。 IMG_FILTER_GAUSSIAN_BLUR：用高斯算法模糊图像。 IMG_FILTER_SELECTIVE_BLUR：模糊图像。 IMG_FILTER_MEAN_REMOVAL：用平均移除法来达到轮廓效果。 IMG_FILTER_SMOOTH：使图像更柔滑。用 arg1 设定柔滑级别。

Note: 此函数仅在与 GD 库捆绑编译的 PHP 版本中可用。

成功时返回 TRUE，或者在失败时返回 FALSE。

Example #1 imagefilter() 灰度例子

<?php$im=imagecreatefrompng('dave.png');if($im&&imagefilter($im,IMG_FILTER_GRAYSCALE)){echo'Imageconvertedtograyscale.';imagepng($im,'dave.png');}else{echo'Conversiontograyscalefailed.';}imagedestroy($im);?>

Example #2 imagefilter() 亮度例子

<?php$im=imagecreatefrompng('sean.png');if($im&&imagefilter($im,IMG_FILTER_BRIGHTNESS,)){echo'Imagebrightnesschanged.';imagepng($im,'sean.png');}else{echo'Imagebrightnesschangefailed.';}imagedestroy($im);?>

Example #3 imagefilter() 上彩例子

<?php$im=imagecreatefrompng('philip.png');/*R,G,B,so0,,0isgreen*/if($im&&imagefilter($im,IMG_FILTER_COLORIZE,0,,0)){echo'Imagesuccessfullyshadedgreen.';imagepng($im,'philip.png');}else{echo'Greenshadingfailed.';}imagedestroy($im);?>

参数

image

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

filtertype

filtertype can be one of the following: IMG_FILTER_NEGATE: Reverses all colors of the image. IMG_FILTER_GRAYSCALE: Converts the image into grayscale. IMG_FILTER_BRIGHTNESS: Changes the brightness of the image. Use arg1 to set the level of brightness. IMG_FILTER_CONTRAST: Changes the contrast of the image. Use arg1 to set the level of contrast. IMG_FILTER_COLORIZE: Like IMG_FILTER_GRAYSCALE, except you can specify the color. Use arg1, arg2 and arg3 in the form of red, blue, green and arg4 for the alpha channel. The range for each color is 0 to . IMG_FILTER_EDGEDETECT: Uses edge detection to highlight the edges in the image. IMG_FILTER_EMBOSS: Embosses the image. IMG_FILTER_GAUSSIAN_BLUR: Blurs the image using the Gaussian method. IMG_FILTER_SELECTIVE_BLUR: Blurs the image. IMG_FILTER_MEAN_REMOVAL: Uses mean removal to achieve a "sketchy" effect. IMG_FILTER_SMOOTH: Makes the image smoother. Use arg1 to set the level of smoothness. IMG_FILTER_PIXELATE: Applies pixelation effect to the image, use arg1 to set the block size and arg2 to set the pixelation effect mode.

arg1

IMG_FILTER_BRIGHTNESS: Brightness level. IMG_FILTER_CONTRAST: Contrast level. IMG_FILTER_COLORIZE: 红色成分的值。 IMG_FILTER_SMOOTH: Smoothness level. IMG_FILTER_PIXELATE: Block size in pixels.

arg2

IMG_FILTER_COLORIZE: 绿色成分的值。 IMG_FILTER_PIXELATE: Whether to use advanced pixelation effect or not (defaults to FALSE).

arg3

IMG_FILTER_COLORIZE: 蓝色成分的值。

arg4

IMG_FILTER_COLORIZE: Alpha channel, A value between 0 and . 0 indicates completely opaque while indicates completely transparent.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

更新日志

版本说明 5.3.0 Pixelation support (IMG_FILTER_PIXELATE) was added. 5.2.5 Alpha support for IMG_FILTER_COLORIZE was added.

范例

Example #4 imagefilter() grayscale example

Example #5 imagefilter() brightness example

<?php$im=imagecreatefrompng('sean.png');if($im&&imagefilter($im,IMG_FILTER_BRIGHTNESS,)){echo'Imagebrightnesschanged.';imagepng($im,'sean.png');imagedestroy($im);}else{echo'Imagebrightnesschangefailed.';}?>

Example #6 imagefilter() colorize example

<?php$im=imagecreatefrompng('philip.png');/*R,G,B,so0,,0isgreen*/if($im&&imagefilter($im,IMG_FILTER_COLORIZE,0,,0)){echo'Imagesuccessfullyshadedgreen.';imagepng($im,'philip.png');imagedestroy($im);}else{echo'Greenshadingfailed.';}?>

Example #7 imagefilter() negate example

<?php//Defineournegatefunctionsoitsportablefor//phpversionswithoutimagefilter()functionnegate($im){if(function_exists('imagefilter')){returnimagefilter($im,IMG_FILTER_NEGATE);}for($x=0;$x<imagesx($im);++$x){for($y=0;$y<imagesy($im);++$y){$index=imagecolorat($im,$x,$y);$rgb=imagecolorsforindex($index);$color=imagecolorallocate($im,-$rgb['red'],-$rgb['green'],-$rgb['blue']);imagesetpixel($im,$x,$y,$color);}}return(true);}$im=imagecreatefromjpeg('kalle.jpg');if($im&&negate($im)){echo'Imagesuccessfullyconvertedtonegativecolors.';imagejpeg($im,'kalle.jpg',);imagedestroy($im);}else{echo'Convertingtonegativecolorsfailed.';}?>

Example #8 imagefilter() pixelate example

<?php//LoadthePHPlogo,weneedtocreatetwoinstances//toshowthedifferences$logo1=imagecreatefrompng('./php.png');$logo2=imagecreatefrompng('./php.png');//Createtheimageinstancewewanttoshowthe//differenceson$output=imagecreatetruecolor(imagesx($logo1)*2,imagesy($logo1));//Applypixelationtoeachinstance,withablock//sizeof3imagefilter($logo1,IMG_FILTER_PIXELATE,3);imagefilter($logo2,IMG_FILTER_PIXELATE,3,true);//Mergethedifferencesontotheoutputimageimagecopy($output,$logo1,0,0,0,0,imagesx($logo1)-1,imagesy($logo1)-1);imagecopy($output,$logo2,imagesx($logo2),0,0,0,imagesx($logo2)-1,imagesy($logo2)-1);imagedestroy($logo1);imagedestroy($logo2);//Outputthedifferencesheader('Content-Type:image/png');imagepng($output);imagedestroy($output);?>

以上例程的输出类似于：

注释

Note: 此函数仅在与 GD 库捆绑编译的 PHP 版本中可用。

参见

imageconvolution() - 用系数 div 和 offset 申请一个 3x3 的卷积矩阵

PHP:imagefilledrectangle()的用法_GD库图像处理函数 imagefilledrectangle(PHP4,PHP5)imagefilledrectangle画一矩形并填充说明boolimagefilledrectangle(resource$image,int$x1,int$y1,int$x2,int$y2,int$color)imagefilledrectangle()在image图像中画

PHP:imagefilltoborder()的用法_GD库图像处理函数 imagefilltoborder(PHP4,PHP5)imagefilltoborder区域填充到指定颜色的边界为止说明boolimagefilltoborder(resource$image,int$x,int$y,int$border,int$color)imagefilltoborder()从x，y（图像

PHP:imagefilledpolygon()的用法_GD库图像处理函数 imagefilledpolygon(PHP4,PHP5)imagefilledpolygon画一多边形并填充说明boolimagefilledpolygon(resource$image,array$points,int$num_points,int$color)imagefilledpolygon()在image图像中画一个

标签: php img

本文链接地址:https://www.jiuchutong.com/biancheng/288346.html 转载请保留说明！

上一篇：PHP:imageflip()的用法_GD库图像处理函数(php imagefill)

下一篇：PHP:imagefilledrectangle()的用法_GD库图像处理函数