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Imagick复合生成较大的输出文件大小

imagick php
  •  0
  • zanderwar  · 技术社区  · 6 年前

    我花了几个小时试图发现在Imagick在另一个上面合成了一个图像之后 7.97KB + 98.39KB = 725.49KB ,当你预计到八分之一的时候。 

    $outputLocation = 'output.png';

$mask = new \Imagick('mask.png');
$overlay = new \Imagick('overlay.png');

$overlay->resizeImage(800, 600, \Imagick::FILTER_LANCZOS, 1);
$overlay->compositeImage($mask, \Imagick::COMPOSITE_COPYOPACITY, 0, 0, \Imagick::CHANNEL_ALPHA);

$overlay->writeImage($outputLocation );
$mask->destroy();
$overlay->destroy();

    有没有人知道我该如何大幅减少输出大小?由于这些图像是用于网络的,并且输入文件很小,我希望大约50KB-100KB左右。

    谢谢你的时间,谢谢

    编辑:我添加了 $imagick->identifyImage()

    掩码:(7.97KB)

    Mask 

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  Format: PNG (Portable Network Graphics)
  Mime type: image/png
  Class: DirectClass
  Geometry: 800x600+0+0
  Units: Undefined
  Type: PaletteAlpha
  Endianess: Undefined
  Colorspace: sRGB
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
    alpha: 8-bit
  Channel statistics:
    Pixels: 480000
    Red:
      min: 52 (0.203922)
      max: 255 (1)
      mean: 231.186 (0.90661)
      standard deviation: 65.3238 (0.256172)
      kurtosis: 3.65714
      skewness: -2.37848
      entropy: 0.521586
    Green:
      min: 52 (0.203922)
      max: 255 (1)
      mean: 231.186 (0.90661)
      standard deviation: 65.3238 (0.256172)
      kurtosis: 3.65714
      skewness: -2.37848
      entropy: 0.521586
    Blue:
      min: 49 (0.192157)
      max: 255 (1)
      mean: 230.834 (0.90523)
      standard deviation: 66.2892 (0.259958)
      kurtosis: 3.65714
      skewness: -2.37848
      entropy: 0.521586
    Alpha:
      min: 0 (0)
      max: 255 (1)
      mean: 29.7496 (0.116665)
      standard deviation: 81.772 (0.320674)
      kurtosis: 3.70517
      skewness: -2.38776
      entropy: 0.549454
  Image statistics:
    Overall:
      min: 0 (0)
      max: 255 (1)
      mean: 229.614 (0.900446)
      standard deviation: 70.0274 (0.274617)
      kurtosis: 4.09826
      skewness: -2.44298
      entropy: 0.528553
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    date:modify: 2019-01-17T17:28:42-07:00
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    输出: (725.49KB!!)

    enter image description here 

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    date:modify: 2019-01-17T21:30:04-07:00
    png:bKGD: chunk was found (see Background color, above)
    png:cHRM: chunk was found (see Chromaticity, above)
    png:gAMA: gamma=0.45454544 (See Gamma, above)
    png:IHDR.bit-depth-orig: 8
    png:IHDR.bit_depth: 8
    png:IHDR.color-type-orig: 6
    png:IHDR.color_type: 6 (RGBA)
    png:IHDR.interlace_method: 0 (Not interlaced)
    png:IHDR.width,height: 800, 600
    png:pHYs: x_res=3779, y_res=3779, units=1
    png:sRGB: intent=0 (Perceptual Intent)
    png:text: 3 tEXt/zTXt/iTXt chunks were found
    png:tIME: 2019-01-17T07:02:14Z
    signature: 9466b41c1f7bea9638e3cda09749e796df0f594fbf5b152060e2ecd671ef80fd
  Tainted: False
  Filesize: 725KB
  Number pixels: 480K
  Pixels per second: 24MB
  User time: 0.030u
  Elapsed time: 0:01.019
  Version: ImageMagick 6.9.4-10 Q16 x86_64 2017-11-14 http://www.imagemagick.org
    1 回复  |  直到 6 年前
        1
  •  0
  •   zanderwar    6 年前

    好的,所有的事情说了做了,最终我的解决方案只是 

    $outputLocation = 'output.png';
$mask = new \Imagick('mask.png');
$overlay = new \Imagick('overlay.png');
$overlay->resizeImage(800, 600, \Imagick::FILTER_LANCZOS, 1);
$overlay->compositeImage($mask, \Imagick::COMPOSITE_COPYOPACITY, 0, 0, \Imagick::CHANNEL_ALPHA);

// Significantly reduced image size whilst retaining decent quality
$overlay->posterizeImage(15, false);
$overlay->despeckleImage();
///////////////////////////

$overlay->writeImage($outputLocation);

    PNG32

    出于测试目的,我使用了一朵鲜艳的花,将大小从750KB减少到124KB,下面是我的最终结果:

    enter image description here

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