PHP cutout tutorial (blending mode + clipping mask)

PS: Everything described in this article requires support from the ImageMagick library. Most hosts support it, but when I build my own local environment, ImageMagick is not turned on by default. The exec function cannot be disabled either.

1. Cutout

<?php
//纯色底抠图
$input="./1.jpg";
//待抠图文件路径
$ouput="./1.png";
//存放路径
$bgcolor="white";
//背景颜色。可使用十六进制色码和rgb(1,1,1)
$fuzz="30000"; 
//容差
exec("convert $input -fuzz $fuzz -transparent $bgcolor $ouput");
//执行抠图操作。并输入到指定路径

Before cutting out (white background):

After cutting out (png transparent):

2. Feather edges (automatically detect background)

<?php
$A1=&#39;1.png&#39;;
$A2=&#39;2.png&#39;;
$A3=&#39;3.png&#39;;
$A4=&#39;4.png&#39;;
$A5=&#39;5.png&#39;;
$img=&#39;待扣图.jpg&#39;;
$im = new Imagick($img);
//8000为边缘容差，修改此数值可适当去除多余相似杂色
$im->transparentPaintImage($im->getImagePixelColor(0, 0), 0, 8000,0);//生成png格式
$im->setImageFormat("png");//保存文件名
$im->writeImage("$A1");//细化边缘
exec("convert $A1 -threshold 75% $A2");
exec("convert $A2 -fill black -opaque white $A3");
exec("convert $A3 -channel RGBA -blur 0x2 $A4");
exec("convert $A1 $A4 -alpha on -compose copy_opacity -composite $A5");
//删除临时图片
unlink($A1);
unlink($A2);
unlink($A3);
unlink($A4);

Before cutting out

##After cutting out

3. Clipping Mask

<?php
$img="1.jpg";//背景
$mask="2.png";//蒙版图。png格式
exec("convert $img $mask -alpha on -compose copy_opacity -composite ouput.png");

Background

Mask

Final effect

4. Blending mode

<?php
//-geometry size size 叠加到指定位置坐标
//-compose xxxx 混合模式
$img=‘1.jpg’;//背景图
$img2=‘2.jpg’;//贴图
exec(&#39;convert $img $img2 -geometry +480+80 -compose Multiply -composite ouput.jpg&#39;);

Background image

Overlay (white background)

Final effect

Mixed mode parameter description: ps:-compose The following parameters are mixed mode

php supports the following mixed mode parameters

Multiply, Screen, Bumpmap, Divide, Plus, Minus,

ModulusAdd, ModulusSubtract, Difference, Exclusion, Lighten, Darken, LightenIntensity, DarkenIntensity,

Mixed mode in Chinese and English

1. Normal mode

2. Dissolve mode

3. Darken mode

4. Multiply Multiply mode

5. Color Burn mode

6. Linear Burn mode

7. Lighten mode

8. Screen mode

9. Color Dodge mode

10. Linear Dodge mode

11. Overlay mode

12. Soft Light mode

13. Hard Light mode

14. Vivid Light ) Mode

15. Linear Light Mode

16. Pin Light Mode

17. Diference Mode

18. Exclusion mode

19. Hue mode

20. Saturation mode

21. Color mode

22. Luminosity mode

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