如何遍历图像的所有像素？

Question

我想循环遍历图像的所有像素,找到该像素的rgba值,并对这些像素执行某些操作.

例

假设我的图像是100x100像素.我想用我已经做过的函数找到每个像素的值:

function getPixel($image, $x, $y) {

  $colors = imagecolorsforindex($image, imagecolorat($image, $x, $y));
  $inrgba = 'rgba(' . $colors['red'] . ',' . $colors['green'] . ',' . $colors['blue'] . ',' . $colors['alpha'] . ')';
  return $inrgba;
}

并将这些值以及图像的尺寸存储在数组或数组数组中.我想在html页面中使用最终结果.

我该怎么做呢？

Answer 1

for($x=1;$x<=$width;$x++)
{
    for($y=1;$y<=$height;$y++)
    {
        $pixel=getPixel($image, $x, $y);
        //do something
    }
}

这样做是找到每列中的每个像素.

i=iteration
pixel coordinate = (x,y)

对于5 x 5图像,迭代看起来像这样:

i1 = (1,1)
i2 = (1,2)
i3 = (1,3)
i4 = (1,4)
i5 = (1,5)
i6 = (2,1)
i7 = (2,2)
i8 = (2,3)
i9 = (2,4)
i10 = (2,5)
i11 = (3,1)
i12 = (3,2)
i13 = (3,3)
i14 = (3,4)
i15 = (3,5)
i16 = (4,1)
i17 = (4,2)
i18 = (4,3)
i19 = (4,4)
i20 = (4,5)
i21 = (5,1)
i22 = (5,2)
i23 = (5,3)
i24 = (5,4)
i25 = (5,5)